{"id":195,"date":"2026-03-27T17:06:25","date_gmt":"2026-03-27T09:06:25","guid":{"rendered":"https:\/\/codergodv.xyz\/?p=195"},"modified":"2026-03-27T17:06:26","modified_gmt":"2026-03-27T09:06:26","slug":"mysql%e5%a4%8d%e5%90%88%e6%9f%a5%e8%af%a2","status":"publish","type":"post","link":"https:\/\/codergodv.xyz\/index.php\/2026\/03\/27\/mysql%e5%a4%8d%e5%90%88%e6%9f%a5%e8%af%a2\/","title":{"rendered":"MySQL\u590d\u5408\u67e5\u8be2"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">MySQL\u590d\u5408\u67e5\u8be2<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u57fa\u672c\u67e5\u8be2\u56de\u987e<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u51c6\u5907\u6d4b\u8bd5\u8868<\/p>\n<\/blockquote>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4e0b\u9762\u7ed9\u51fa\u4e09\u5f20\u8868\uff0c\u5206\u522b\u662f\u5458\u5de5\u8868\uff08emp\uff09\u3001\u90e8\u95e8\u8868\uff08dept\uff09\u548c\u5de5\u8d44\u7b49\u7ea7\u8868\uff08salgrade\uff09\u3002<\/li>\n\n\n\n<li>\u540e\u7eed\u6240\u8981\u8fdb\u884c\u7684\u67e5\u8be2\u64cd\u4f5c\u90fd\u5c06\u4ee5\u8fd9\u4e09\u5f20\u8868\u4f5c\u4e3a\u6570\u636e\u6e90\uff0c\u5305\u62ec\u57fa\u672c\u67e5\u8be2\u548c\u590d\u5408\u67e5\u8be2\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u5458\u5de5\u8868\uff08emp\uff09\u4e2d\u5305\u542b\u5982\u4e0b\u5b57\u6bb5\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u96c7\u5458\u7f16\u53f7\uff08empno\uff09\u3002<\/li>\n\n\n\n<li>\u96c7\u5458\u59d3\u540d\uff08ename\uff09\u3002<\/li>\n\n\n\n<li>\u96c7\u5458\u804c\u4f4d\uff08job\uff09\u3002<\/li>\n\n\n\n<li>\u96c7\u5458\u9886\u5bfc\u7f16\u53f7\uff08mgr\uff09\u3002<\/li>\n\n\n\n<li>\u96c7\u4f63\u65f6\u95f4\uff08hiredate\uff09\u3002<\/li>\n\n\n\n<li>\u5de5\u8d44\u6708\u85aa\uff08sal\uff09\u3002<\/li>\n\n\n\n<li>\u5956\u91d1\uff08comm\uff09\u3002<\/li>\n\n\n\n<li>\u90e8\u95e8\u7f16\u53f7\uff08deptno\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u5458\u5de5\u8868\uff08emp\uff09\u4e2d\u7684\u5185\u5bb9\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/2f2613c0ef7b4941a42161e2a6f84282.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/2f2613c0ef7b4941a42161e2a6f84282.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<p>\u90e8\u95e8\u8868\uff08dept\uff09\u4e2d\u5305\u542b\u5982\u4e0b\u5b57\u6bb5\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u90e8\u95e8\u7f16\u53f7\uff08deptno\uff09\u3002<\/li>\n\n\n\n<li>\u90e8\u95e8\u540d\u79f0\uff08dname\uff09\u3002<\/li>\n\n\n\n<li>\u90e8\u95e8\u6240\u5728\u5730\u70b9\uff08loc\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u90e8\u95e8\u8868\uff08dept\uff09\u4e2d\u7684\u5185\u5bb9\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/2e51edc0fcff49fe9eaafa5370eb3fbb.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/2e51edc0fcff49fe9eaafa5370eb3fbb.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<p>\u5de5\u8d44\u7b49\u7ea7\u8868\uff08salgrade\uff09\u4e2d\u5305\u542b\u5982\u4e0b\u5b57\u6bb5\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7b49\u7ea7\uff08grade\uff09\u3002<\/li>\n\n\n\n<li>\u6b64\u7b49\u7ea7\u6700\u4f4e\u5de5\u8d44\uff08losal\uff09\u3002<\/li>\n\n\n\n<li>\u6b64\u7b49\u7ea7\u6700\u9ad8\u5de5\u8d44\uff08hisal\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u5de5\u8d44\u7b49\u7ea7\u8868\uff08salgrade\uff09\u4e2d\u7684\u5185\u5bb9\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/bd7196eaa3564da5a5b187ba4bfea5f5.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/bd7196eaa3564da5a5b187ba4bfea5f5.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u67e5\u8be2\u5de5\u8d44\u9ad8\u4e8e500\u6216\u5c97\u4f4d\u4e3aMANAGER\u7684\u5458\u5de5\uff0c\u540c\u65f6\u8981\u6c42\u5458\u5de5\u59d3\u540d\u7684\u9996\u5b57\u6bcd\u4e3a\u5927\u5199\u7684J<\/p>\n<\/blockquote>\n\n\n\n<p>\u5728where\u5b50\u53e5\u4e2d\u6307\u660e\u7b5b\u9009\u6761\u4ef6\u4e3a\u5de5\u8d44\u9ad8\u4e8e500\u6216\u5c97\u4f4d\u4e3aMANAGER\uff0c\u5e76\u4e14\u901a\u8fc7\u6a21\u7cca\u5339\u914d\u6307\u660e\u5458\u5de5\u59d3\u540d\u7684\u9996\u5b57\u6bcd\u4e3a\u5927\u5199\u7684J\uff0c\u5728select\u7684column\u5217\u8868\u4e2d\u6307\u660e\u8981\u67e5\u8be2\u7684\u5217\u4e3a\u59d3\u540d\u3001\u5de5\u8d44\u548c\u5c97\u4f4d\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/2e4bce506fd347cd9b3cd3e51106c93c.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/2e4bce506fd347cd9b3cd3e51106c93c.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u67e5\u8be2\u5458\u5de5\u4fe1\u606f\uff0c\u6309\u90e8\u95e8\u53f7\u5347\u5e8f\u800c\u5458\u5de5\u5de5\u8d44\u964d\u5e8f\u663e\u793a<\/p>\n<\/blockquote>\n\n\n\n<p>\u5728select\u7684column\u5217\u8868\u4e2d\u6307\u660e\u8981\u67e5\u8be2\u7684\u5217\u4e3a\u59d3\u540d\u548c\u5e74\u85aa\uff0c\u5728order by\u5b50\u53e5\u4e2d\u6307\u660e\u6309\u5e74\u85aa\u8fdb\u884c\u964d\u5e8f\u6392\u5e8f\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/07a1fadbba9b4b7cbaa71e5825d12224.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/07a1fadbba9b4b7cbaa71e5825d12224.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<p><strong>\u8bf4\u660e\u4e00\u4e0b\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7531\u4e8eNULL\u4e0e\u4efb\u4f55\u503c\u505a\u8ba1\u7b97\u5f97\u5230\u7684\u7ed3\u679c\u90fd\u662fNULL\uff0c\u56e0\u6b64\u5728\u8ba1\u7b97\u5e74\u85aa\u65f6\u4e0d\u80fd\u76f4\u63a5\u7528\u6708\u85aa\u768412\u500d\u52a0\u4e0a\u6bcf\u4e2a\u5458\u5de5\u7684\u5956\u91d1\uff0c\u8fd9\u6837\u53ef\u80fd\u5bfc\u81f4\u5f97\u5230\u7684\u5e74\u85aa\u4e3aNULL\u503c\u3002<\/li>\n\n\n\n<li>\u5728\u8ba1\u7b97\u6bcf\u4e2a\u5458\u5de5\u7684\u5e74\u85aa\u65f6\uff0c\u5e94\u8be5\u901a\u8fc7ifnull\u51fd\u6570\u5224\u65ad\u5458\u5de5\u7684\u5956\u91d1\u662f\u5426\u4e3aNULL\uff0c\u5982\u679c\u4e0d\u4e3aNULL\u5219ifnull\u51fd\u6570\u8fd4\u56de\u5458\u5de5\u7684\u5956\u91d1\uff0c\u5982\u679c\u4e3aNULL\u5219ifnull\u51fd\u6570\u8fd4\u56de0\uff0c\u907f\u514d\u8ba9NULL\u503c\u53c2\u4e0e\u8ba1\u7b97\u3002<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u67e5\u8be2\u5de5\u8d44\u6700\u9ad8\u7684\u5458\u5de5\u7684\u59d3\u540d\u548c\u5c97\u4f4d<\/p>\n<\/blockquote>\n\n\n\n<p>\u89e3\u51b3\u8be5\u95ee\u9898\u9700\u8981\u8fdb\u884c\u4e24\u6b21\u67e5\u8be2\uff0c\u5148\u5bf9\u5458\u5de5\u8868\u8fdb\u884c\u4e00\u6b21\u67e5\u8be2\u5f97\u5230\u6700\u9ad8\u5de5\u8d44\uff0c\u7136\u540e\u518d\u6839\u636e\u6700\u9ad8\u5de5\u8d44\u5bf9\u5458\u5de5\u8868\u8fdb\u884c\u4e00\u6b21\u67e5\u8be2\uff0c\u5f97\u5230\u5de5\u8d44\u7b49\u4e8e\u6700\u9ad8\u5de5\u8d44\u7684\u5458\u5de5\u7684\u59d3\u540d\u548c\u5c97\u4f4d\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/9c749a99534e4508a65c93431cb942c3.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/9c749a99534e4508a65c93431cb942c3.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<p>\u6b64\u5916\uff0c\u8fd9\u79cd\u95ee\u9898\u8fd8\u53ef\u4ee5\u4f7f\u7528<a href=\"https:\/\/so.csdn.net\/so\/search?q=\u5b50\u67e5\u8be2&amp;spm=1001.2101.3001.7020\">\u5b50\u67e5\u8be2<\/a>\uff0c\u5c06\u7b2c\u4e00\u6b21\u67e5\u8be2\u7684SQL\u8bed\u53e5\u7528\u62ec\u53f7\u62ec\u8d77\u6765\uff0c\u4f5c\u4e3a\u6700\u9ad8\u5de5\u8d44\u76f4\u63a5\u5728\u7b2c\u4e8c\u6b21\u67e5\u8be2\u7684SQL\u8bed\u53e5\u4e2d\u4f7f\u7528\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/d26e3a8342084401906cafae22a6d632.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/d26e3a8342084401906cafae22a6d632.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u67e5\u8be2\u5de5\u8d44\u9ad8\u4e8e\u5e73\u5747\u5de5\u8d44\u7684\u5458\u5de5\u4fe1\u606f<\/p>\n<\/blockquote>\n\n\n\n<p>\u89e3\u51b3\u8be5\u95ee\u9898\u4e5f\u9700\u8981\u8fdb\u884c\u4e24\u6b21\u67e5\u8be2\uff0c\u5148\u5bf9\u5458\u5de5\u8868\u8fdb\u884c\u4e00\u6b21\u67e5\u8be2\u5f97\u5230\u5e73\u5747\u5de5\u8d44\uff0c\u7136\u540e\u518d\u6839\u636e\u5e73\u5747\u5de5\u8d44\u5bf9\u5458\u5de5\u8868\u8fdb\u884c\u4e00\u6b21\u67e5\u8be2\uff0c\u7b5b\u9009\u51fa\u5de5\u8d44\u9ad8\u4e8e\u5e73\u5747\u5de5\u8d44\u7684\u5458\u5de5\u4fe1\u606f\uff0c\u8be5\u95ee\u9898\u540c\u6837\u53ef\u4ee5\u4f7f\u7528\u5b50\u67e5\u8be2\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/053732e4a3c84817861d918e03aac7f3.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/053732e4a3c84817861d918e03aac7f3.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u67e5\u8be2\u6bcf\u4e2a\u90e8\u95e8\u7684\u5e73\u5747\u5de5\u8d44\u548c\u6700\u9ad8\u5de5\u8d44<\/p>\n<\/blockquote>\n\n\n\n<p>\u5728group by\u5b50\u53e5\u4e2d\u6307\u660e\u6309\u7167\u90e8\u95e8\u53f7\u8fdb\u884c\u5206\u7ec4\uff0c\u5728select\u8bed\u53e5\u4e2d\u4f7f\u7528<a href=\"https:\/\/so.csdn.net\/so\/search?q=avg\u51fd\u6570&amp;spm=1001.2101.3001.7020\">avg\u51fd\u6570<\/a>\u548cmax\u51fd\u6570\uff0c\u5206\u522b\u67e5\u8be2\u6bcf\u4e2a\u90e8\u95e8\u7684\u5e73\u5747\u5de5\u8d44\u548c\u6700\u9ad8\u5de5\u8d44\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/40c1522b68be435e828b41f63251b1db.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/40c1522b68be435e828b41f63251b1db.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u67e5\u8be2\u5e73\u5747\u5de5\u8d44\u4f4e\u4e8e2000\u7684\u90e8\u95e8\u53f7\u548c\u5b83\u7684\u5e73\u5747\u5de5\u8d44<\/p>\n<\/blockquote>\n\n\n\n<p>\u5728group by\u5b50\u53e5\u4e2d\u6307\u660e\u6309\u7167\u90e8\u95e8\u53f7\u8fdb\u884c\u5206\u7ec4\uff0c\u5728select\u8bed\u53e5\u4e2d\u4f7f\u7528avg\u51fd\u6570\u67e5\u8be2\u6bcf\u4e2a\u90e8\u95e8\u7684\u5e73\u5747\u5de5\u8d44\uff0c\u5728having\u5b50\u53e5\u4e2d\u6307\u660e\u7b5b\u9009\u6761\u4ef6\u4e3a\u5e73\u5747\u5de5\u8d44\u5c0f\u4e8e2000\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/c58adc40d5494d4cbae878bbfb71a666.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/c58adc40d5494d4cbae878bbfb71a666.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u67e5\u8be2\u6bcf\u79cd\u5c97\u4f4d\u7684\u96c7\u5458\u603b\u6570\u548c\u5e73\u5747\u5de5\u8d44<\/p>\n<\/blockquote>\n\n\n\n<p>\u5728group by\u5b50\u53e5\u4e2d\u6307\u660e\u6309\u7167\u5c97\u4f4d\u8fdb\u884c\u5206\u7ec4\uff0c\u5728select\u8bed\u53e5\u4e2d\u4f7f\u7528count\u51fd\u6570\u548cavg\u51fd\u6570\uff0c\u5206\u522b\u67e5\u8be2\u6bcf\u79cd\u5c97\u4f4d\u7684\u96c7\u5458\u603b\u6570\u548c\u5e73\u5747\u5de5\u8d44\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/c315d7b301b5443ca386c5bd820f8b40.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/c315d7b301b5443ca386c5bd820f8b40.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">\u591a\u8868\u67e5\u8be2<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u591a\u8868\u67e5\u8be2<\/p>\n<\/blockquote>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4e0a\u9762\u7684\u57fa\u7840\u67e5\u8be2\u90fd\u662f\u5728\u4e00\u5f20\u8868\u7684\u57fa\u7840\u4e0a\u8fdb\u884c\u7684\u67e5\u8be2\uff0c\u800c\u5b9e\u9645\u5f00\u53d1\u4e2d\u5f80\u5f80\u9700\u8981\u5c06\u591a\u5f20\u8868\u5173\u8054\u8d77\u6765\u8fdb\u884c\u67e5\u8be2\uff0c\u8fd9\u5c31\u53eb\u505a\u591a\u8868\u67e5\u8be2\u3002<\/li>\n\n\n\n<li>\u5728\u8fdb\u884c\u591a\u8868\u67e5\u8be2\u65f6\uff0c\u53ea\u9700\u8981\u5c06\u591a\u5f20\u8868\u7684\u8868\u540d\u4f9d\u6b21\u653e\u5230from\u5b50\u53e5\u4e4b\u540e\uff0c\u7528\u9017\u53f7\u9694\u5f00\u5373\u53ef\uff0c\u8fd9\u65f6MySQL\u5c06\u4f1a\u5bf9\u7ed9\u5b9a\u7684\u8fd9\u591a\u5f20\u8868\u53d6\u7b1b\u5361\u5c14\u79ef\uff0c\u4f5c\u4e3a\u591a\u8868\u67e5\u8be2\u7684\u521d\u59cb\u6570\u636e\u6e90\u3002<\/li>\n\n\n\n<li>\u591a\u8868\u67e5\u8be2\u7684\u672c\u8d28\uff0c\u5c31\u662f\u5bf9\u7ed9\u5b9a\u7684\u591a\u5f20\u8868\u53d6\u7b1b\u5361\u5c14\u79ef\uff0c\u7136\u540e\u5728\u7b1b\u5361\u5c14\u79ef\u4e2d\u8fdb\u884c\u67e5\u8be2\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u6240\u8c13\u7684\u5bf9\u591a\u5f20\u8868\u53d6\u7b1b\u5361\u5c14\u79ef\uff0c\u5c31\u662f\u5f97\u5230\u8fd9\u591a\u5f20\u8868\u7684\u8bb0\u5f55\u7684\u6240\u6709\u53ef\u80fd\u6709\u5e8f\u5bf9\u7ec4\u6210\u7684\u96c6\u5408\uff0c\u6bd4\u5982\u4e0b\u9762\u5bf9\u5458\u5de5\u8868\u548c\u90e8\u95e8\u8868\u8fdb\u884c\u591a\u8868\u67e5\u8be2\uff0c\u7531\u4e8e\u67e5\u8be2\u8bed\u53e5\u4e2d\u6ca1\u6709\u6307\u660e\u7b5b\u9009\u6761\u4ef6\uff0c\u56e0\u6b64\u6700\u7ec8\u5f97\u5230\u7684\u7ed3\u679c\u4fbf\u662f\u5458\u5de5\u8868\u548c\u90e8\u95e8\u8868\u7684\u7b1b\u5361\u5c14\u79ef\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/20622069e8404c14a928a912dcc91c2b.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/20622069e8404c14a928a912dcc91c2b.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<p><strong>\u8bf4\u660e\u4e00\u4e0b\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5458\u5de5\u8868\u548c\u90e8\u95e8\u8868\u7684\u7b1b\u5361\u5c14\u79ef\u7531\u4e24\u90e8\u5206\u7ec4\u6210\uff0c\u524d\u534a\u90e8\u5206\u662f\u5458\u5de5\u8868\u7684\u5217\u4fe1\u606f\uff0c\u540e\u534a\u90e8\u5206\u662f\u90e8\u95e8\u8868\u7684\u5217\u4fe1\u606f\u3002<\/li>\n\n\n\n<li>\u5bf9\u5458\u5de5\u8868\u548c\u90e8\u95e8\u8868\u53d6\u7b1b\u5361\u5c14\u79ef\u65f6\uff0c\u4f1a\u5148\u4ece\u5458\u5de5\u8868\u4e2d\u9009\u51fa\u4e00\u6761\u8bb0\u5f55\u4e0e\u90e8\u95e8\u8868\u4e2d\u7684\u6240\u6709\u8bb0\u5f55\u8fdb\u884c\u7ec4\u5408\uff0c\u7136\u540e\u518d\u4ece\u5458\u5de5\u8868\u4e2d\u9009\u51fa\u4e00\u6761\u8bb0\u5f55\u4e0e\u90e8\u95e8\u8868\u4e2d\u7684\u6240\u6709\u8bb0\u5f55\u8fdb\u884c\u7ec4\u5408\uff0c\u4ee5\u6b64\u7c7b\u63a8\uff0c\u6700\u7ec8\u5f97\u5230\u7684\u5c31\u662f\u8fd9\u4e24\u5f20\u8868\u7684\u7b1b\u5361\u5c14\u79ef\u3002<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u7b1b\u5361\u5c14\u79ef\u7684\u521d\u6b65\u8fc7\u6ee4<\/p>\n<\/blockquote>\n\n\n\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5bf9\u591a\u5f20\u8868\u53d6\u7b1b\u5361\u5c14\u79ef\u540e\u5f97\u5230\u7684\u6570\u636e\u5e76\u4e0d\u90fd\u662f\u6709\u610f\u4e49\u7684\uff0c\u6bd4\u5982\u5bf9\u5458\u5de5\u8868\u548c\u90e8\u95e8\u8868\u53d6\u7b1b\u5361\u5c14\u79ef\u65f6\uff0c\u5458\u5de5\u8868\u4e2d\u7684\u6bcf\u4e00\u4e2a\u5458\u5de5\u4fe1\u606f\u90fd\u4f1a\u548c\u90e8\u95e8\u8868\u4e2d\u7684\u6bcf\u4e00\u4e2a\u90e8\u95e8\u4fe1\u606f\u8fdb\u884c\u7ec4\u5408\uff0c\u800c\u5b9e\u9645\u4e00\u4e2a\u5458\u5de5\u53ea\u6709\u548c\u81ea\u5df1\u6240\u5728\u7684\u90e8\u95e8\u4fe1\u606f\u8fdb\u884c\u7ec4\u5408\u624d\u662f\u6709\u610f\u4e49\u7684\uff0c\u56e0\u6b64\u9700\u8981\u4ece\u7b1b\u5361\u5c14\u79ef\u4e2d\u7b5b\u9009\u51fa\u5458\u5de5\u7684\u90e8\u95e8\u53f7\u548c\u90e8\u95e8\u7684\u7f16\u53f7\u76f8\u7b49\u8bb0\u5f55\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/0fd3f6b747e4486d9d0d5db8ecdc3414.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/0fd3f6b747e4486d9d0d5db8ecdc3414.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<p><strong>\u8bf4\u660e\u4e00\u4e0b\uff1a<\/strong> \u8fdb\u884c\u7b1b\u5361\u5c14\u79ef\u7684\u591a\u5f20\u8868\u4e2d\u53ef\u80fd\u4f1a\u5b58\u5728\u76f8\u540c\u7684\u5217\u540d\uff0c\u8fd9\u65f6\u5728\u9009\u4e2d\u5217\u540d\u65f6\u9700\u8981\u901a\u8fc7<code>\u8868\u540d.\u5217\u540d<\/code>\u7684\u65b9\u5f0f\u8fdb\u884c\u6307\u660e\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u663e\u793a\u90e8\u95e8\u53f7\u4e3a10\u7684\u90e8\u95e8\u540d\u3001\u5458\u5de5\u540d\u548c\u5458\u5de5\u5de5\u8d44<\/p>\n<\/blockquote>\n\n\n\n<p>\u7531\u4e8e\u90e8\u95e8\u540d\u53ea\u6709\u90e8\u95e8\u8868\u4e2d\u624d\u6709\uff0c\u800c\u5458\u5de5\u540d\u548c\u5458\u5de5\u5de5\u8d44\u53ea\u6709\u5458\u5de5\u8868\u4e2d\u624d\u6709\uff0c\u56e0\u6b64\u9700\u8981\u540c\u65f6\u4f7f\u7528\u5458\u5de5\u8868\u548c\u90e8\u95e8\u8868\u8fdb\u884c\u591a\u8868\u67e5\u8be2\uff0c\u5728where\u5b50\u53e5\u4e2d\u6307\u660e\u7b5b\u9009\u6761\u4ef6\u4e3a\u5458\u5de5\u7684\u90e8\u95e8\u53f7\u7b49\u4e8e\u90e8\u95e8\u7f16\u53f7\uff0c\u5e76\u4e14\u90e8\u95e8\u53f7\u4e3a10\u7684\u8bb0\u5f55\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/0f64855e5e9f46fbacbe52278159dee7.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/0f64855e5e9f46fbacbe52278159dee7.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<p><strong>\u8bf4\u660e\u4e00\u4e0b\uff1a<\/strong> \u7b2c\u4e00\u4e2a\u7b5b\u9009\u6761\u4ef6\u5df2\u7ecf\u7b5b\u9009\u51fa\u5458\u5de5\u7684\u90e8\u95e8\u53f7\u548c\u90e8\u95e8\u7f16\u53f7\u76f8\u7b49\u7684\u8bb0\u5f55\uff0c\u56e0\u6b64\u5728\u7b5b\u9009\u90e8\u95e8\u53f7\u7b49\u4e8e10\u7684\u90e8\u95e8\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u5458\u5de5\u8868\u4e2d\u7684\u90e8\u95e8\u53f7\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u90e8\u95e8\u8868\u4e2d\u7684\u90e8\u95e8\u7f16\u53f7\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u663e\u793a\u5404\u4e2a\u5458\u5de5\u7684\u59d3\u540d\u3001\u5de5\u8d44\u548c\u5de5\u8d44\u7ea7\u522b<\/p>\n<\/blockquote>\n\n\n\n<p>\u7531\u4e8e\u5458\u5de5\u540d\u548c\u5de5\u8d44\u53ea\u6709\u5458\u5de5\u8868\u4e2d\u624d\u6709\uff0c\u800c\u5de5\u8d44\u7ea7\u522b\u53ea\u6709\u5de5\u8d44\u7b49\u7ea7\u8868\u4e2d\u624d\u6709\uff0c\u56e0\u6b64\u9700\u8981\u540c\u65f6\u4f7f\u7528\u5458\u5de5\u8868\u548c\u5de5\u8d44\u7b49\u7ea7\u8868\u8fdb\u884c\u591a\u8868\u67e5\u8be2\uff0c\u5728where\u5b50\u53e5\u4e2d\u6307\u660e\u7b5b\u9009\u6761\u4ef6\u4e3a\u5458\u5de5\u7684\u5de5\u8d44\u5728losal\u548chisal\u4e4b\u95f4\u7684\u8bb0\u5f55\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/398d68e3f1444c83a36c9dcf5ee296bd.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/398d68e3f1444c83a36c9dcf5ee296bd.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<p><strong>\u8bf4\u660e\u4e00\u4e0b\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5458\u5de5\u8868\u548c\u5de5\u8d44\u7b49\u7ea7\u8868\u7684\u7b1b\u5361\u5c14\u79ef\u4e2d\uff0c\u5c06\u6bcf\u4e00\u4e2a\u5458\u5de5\u7684\u4fe1\u606f\u548c\u6bcf\u4e00\u4e2a\u5de5\u8d44\u7b49\u7ea7\u7684\u4fe1\u606f\u90fd\u8fdb\u884c\u4e86\u7ec4\u5408\uff0c\u800c\u5b9e\u9645\u4e00\u4e2a\u5458\u5de5\u53ea\u6709\u548c\u81ea\u5df1\u7684\u5de5\u8d44\u5bf9\u5e94\u7684\u5de5\u8d44\u7b49\u7ea7\u4fe1\u606f\u8fdb\u884c\u7ec4\u5408\u624d\u662f\u6709\u610f\u4e49\u7684\u3002<\/li>\n\n\n\n<li>\u56e0\u6b64\u9700\u8981\u6839\u636e\u5404\u4e2a\u5de5\u8d44\u7b49\u7ea7\u7684\u6700\u4f4e\u5de5\u8d44\u548c\u6700\u9ad8\u5de5\u8d44\u5224\u65ad\u4e00\u4e2a\u5458\u5de5\u662f\u5426\u5c5e\u4e8e\u8be5\u5de5\u8d44\u7b49\u7ea7\uff0c\u8fdb\u800c\u7b5b\u9009\u51fa\u6709\u610f\u4e49\u7684\u8bb0\u5f55\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u81ea\u8fde\u63a5<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u81ea\u8fde\u63a5<\/p>\n<\/blockquote>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u81ea\u8fde\u63a5\u662f\u6307\u5728\u540c\u4e00\u5f20\u8868\u8fdb\u884c\u8fde\u63a5\u67e5\u8be2\uff0c\u4e5f\u5c31\u662f\u8bf4\u6211\u4eec\u4e0d\u4ec5\u53ef\u4ee5\u53d6\u4e0d\u540c\u8868\u7684\u7b1b\u5361\u5c14\u79ef\uff0c\u4e5f\u53ef\u4ee5\u5bf9\u540c\u4e00\u5f20\u8868\u53d6\u7b1b\u5361\u5c14\u79ef\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u4e00\u5f20\u8868\u4e2d\u7684\u67d0\u4e2a\u5b57\u6bb5\u80fd\u591f\u5c06\u8868\u4e2d\u7684\u591a\u6761\u8bb0\u5f55\u5173\u8054\u8d77\u6765\uff0c\u90a3\u4e48\u5c31\u53ef\u4ee5\u901a\u8fc7\u81ea\u8fde\u63a5\u5c06\u8868\u4e2d\u901a\u8fc7\u8be5\u5b57\u6bb5\u5173\u8054\u7684\u8bb0\u5f55\u7ec4\u5408\u8d77\u6765\u3002<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u663e\u793a\u5458\u5de5FORD\u7684\u4e0a\u7ea7\u9886\u5bfc\u7684\u7f16\u53f7\u548c\u59d3\u540d<\/p>\n<\/blockquote>\n\n\n\n<p>\u89e3\u51b3\u8be5\u95ee\u9898\u53ef\u4ee5\u4f7f\u7528\u5b50\u67e5\u8be2\uff0c\u5148\u5bf9\u5458\u5de5\u8868\u8fdb\u884c\u67e5\u8be2\u5f97\u5230FORD\u7684\u9886\u5bfc\u7684\u7f16\u53f7\uff0c\u7136\u540e\u518d\u6839\u636e\u9886\u5bfc\u7684\u7f16\u53f7\u5bf9\u5458\u5de5\u8868\u8fdb\u884c\u67e5\u8be2\u5f97\u5230FORD\u9886\u5bfc\u7684\u59d3\u540d\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/c6acaecf77e747cd9e7bba871643d201.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/c6acaecf77e747cd9e7bba871643d201.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<p>\u6b64\u5916\uff0c\u89e3\u51b3\u8be5\u95ee\u9898\u4e5f\u53ef\u4ee5\u4f7f\u7528\u81ea\u8fde\u63a5\uff0c\u56e0\u4e3a\u5458\u5de5\u8868\u4e2d\u7684mgr\u5b57\u6bb5\u80fd\u591f\u5c06\u8868\u4e2d\u5458\u5de5\u7684\u4fe1\u606f\u548c\u5458\u5de5\u9886\u5bfc\u7684\u4fe1\u606f\u5173\u8054\u8d77\u6765\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/335859275b594946bb6b32544795f998.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/335859275b594946bb6b32544795f998.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<p>\u5bf9\u5458\u5de5\u8868\u8fdb\u884c\u81ea\u8fde\u63a5\u540e\uff0c\u5728where\u5b50\u53e5\u4e2d\u6307\u660e\u7b5b\u9009\u6761\u4ef6\u4e3a\u5458\u5de5\u7684\u9886\u5bfc\u7f16\u53f7\u7b49\u4e8e\u9886\u5bfc\u7684\u7f16\u53f7\uff0c\u8fd9\u65f6\u5c31\u80fd\u7b5b\u9009\u51fa\u6bcf\u4e2a\u5458\u5de5\u4fe1\u606f\u4e0e\u5176\u9886\u5bfc\u4fe1\u606f\u7ec4\u5408\u5f62\u6210\u7684\u8bb0\u5f55\uff0c\u8fdb\u4e00\u6b65\u6307\u660e\u7b5b\u9009\u6761\u4ef6\u4e3a\u5458\u5de5\u7684\u59d3\u540d\u4e3aFORD\uff0c\u8fd9\u65f6\u4fbf\u80fd\u7b5b\u9009\u51fa\u5458\u5de5FORD\u7684\u4fe1\u606f\u548c\u4ed6\u7684\u9886\u5bfc\u7684\u4fe1\u606f\u7ec4\u6210\u7684\u8bb0\u5f55\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/2ca0b8c6283b450097f2a41e5926273e.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/2ca0b8c6283b450097f2a41e5926273e.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<p><strong>\u8bf4\u660e\u4e00\u4e0b\uff1a<\/strong> \u7531\u4e8e\u81ea\u8fde\u63a5\u662f\u5bf9\u540c\u4e00\u5f20\u8868\u53d6\u7b1b\u5361\u5c14\u79ef\uff0c\u56e0\u6b64\u5728\u81ea\u8fde\u63a5\u65f6\u81f3\u5c11\u9700\u8981\u7ed9\u4e00\u5f20\u8868\u53d6\u522b\u540d\uff0c\u5426\u5219\u65e0\u6cd5\u533a\u5206\u8fd9\u4e24\u5f20\u8868\u4e2d\u7684\u5217\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5b50\u67e5\u8be2<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5b50\u67e5\u8be2\u662f\u6307\u5d4c\u5165\u5728\u5176\u4ed6SQL\u8bed\u53e5\u4e2d\u7684\u67e5\u8be2\u8bed\u53e5\uff0c\u4e5f\u53eb\u5d4c\u5957\u67e5\u8be2\u3002<\/li>\n\n\n\n<li>\u5b50\u67e5\u8be2\u53ef\u5206\u4e3a\u5355\u884c\u5b50\u67e5\u8be2\u3001\u591a\u884c\u5b50\u67e5\u8be2\u3001\u591a\u5217\u5b50\u67e5\u8be2\uff0c\u4ee5\u53ca\u5728from\u5b50\u53e5\u4e2d\u4f7f\u7528\u7684\u5b50\u67e5\u8be2\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u5355\u884c\u5b50\u67e5\u8be2<\/h4>\n\n\n\n<p>\u5355\u884c\u5b50\u67e5\u8be2\uff0c\u662f\u6307\u8fd4\u56de\u5355\u884c\u5355\u5217\u6570\u636e\u7684\u5b50\u67e5\u8be2\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u663e\u793aSMITH\u540c\u4e00\u90e8\u95e8\u7684\u5458\u5de5<\/p>\n<\/blockquote>\n\n\n\n<p>\u5728\u5b50\u67e5\u8be2\u4e2d\u67e5\u8be2SMITH\u6240\u5728\u7684\u90e8\u95e8\u53f7\uff0c\u5728where\u5b50\u53e5\u4e2d\u6307\u660e\u7b5b\u9009\u6761\u4ef6\u4e3a\u5458\u5de5\u90e8\u95e8\u53f7\u7b49\u4e8e\u5b50\u67e5\u8be2\u8fd4\u56de\u7684\u90e8\u95e8\u53f7\uff0c\u5e76\u4e14\u5458\u5de5\u7684\u59d3\u540d\u4e0d\u4e3aSMITH\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/58a25ab8c15049a289cb8d8bb2cc78d7.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/58a25ab8c15049a289cb8d8bb2cc78d7.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<p>\u6b64\u5916\uff0c\u89e3\u51b3\u8be5\u95ee\u9898\u4e5f\u53ef\u4ee5\u4f7f\u7528\u81ea\u8fde\u63a5\uff0c\u56e0\u4e3a\u548cSMITH\u540c\u4e00\u90e8\u95e8\u7684\u5458\u5de5\u7684\u4fe1\u606f\u4e5f\u5728\u5458\u5de5\u8868\u5f53\u4e2d\uff0c\u56e0\u6b64\u5bf9\u5458\u5de5\u8868\u8fdb\u884c\u81ea\u8fde\u63a5\u540e\uff0c\u5728where\u5b50\u53e5\u4e2d\u6307\u660e\u88681\u7684\u5458\u5de5\u59d3\u540d\u4e3aSMITH\uff0c\u5e76\u4e14\u88681\u548c\u88682\u7684\u90e8\u95e8\u53f7\u5fc5\u987b\u76f8\u7b49\uff0c\u5e76\u4e14\u88682\u7684\u5458\u5de5\u59d3\u540d\u4e0d\u4e3aSMITH\uff0c\u8fd9\u6837\u4e5f\u80fd\u7b5b\u9009\u51fa\u548cSMITH\u540c\u4e00\u90e8\u95e8\u7684\u5458\u5de5\u4fe1\u606f\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/f5e3a4ea6fdb48e9b757b8a9bd7889e2.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/f5e3a4ea6fdb48e9b757b8a9bd7889e2.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"img\"\/><\/div><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">\u591a\u884c\u5b50\u67e5\u8be2<\/h4>\n\n\n\n<p>\u591a\u884c\u5b50\u67e5\u8be2\uff0c\u662f\u6307\u8fd4\u56de\u591a\u884c\u5355\u5217\u6570\u636e\u7684\u5b50\u67e5\u8be2<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>in\u5173\u952e\u5b57\uff1a\u663e\u793a\u548c10\u53f7\u90e8\u95e8\u7684\u5de5\u4f5c\u5c97\u4f4d\u76f8\u540c\u7684\u5458\u5de5\u7684\u540d\u5b57\u3001\u5c97\u4f4d\u3001\u5de5\u8d44\u548c\u90e8\u95e8\u53f7\uff0c\u4f46\u662f\u4e0d\u5305\u542b10\u53f7\u90e8\u95e8\u7684\u5458\u5de5<\/p>\n<\/blockquote>\n\n\n\n<p>\u5148\u67e5\u8be210\u53f7\u90e8\u95e8\u6709\u54ea\u4e9b\u5de5\u4f5c\u5c97\u4f4d\uff0c\u5728\u67e5\u8be2\u65f6\u6700\u597d\u5bf9\u7ed3\u679c\u8fdb\u884c\u53bb\u91cd\uff0c\u56e0\u4e3a10\u53f7\u90e8\u95e8\u7684\u67d0\u4e9b\u5458\u5de5\u7684\u5de5\u4f5c\u5c97\u4f4d\u53ef\u80fd\u662f\u76f8\u540c\u7684\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/e40e4027a0bf47e385684510cb4b3d8e.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/e40e4027a0bf47e385684510cb4b3d8e.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<p>\u7136\u540e\u5c06\u4e0a\u8ff0\u67e5\u8be2\u4f5c\u4e3a\u5b50\u67e5\u8be2\uff0c\u5728\u67e5\u8be2\u5458\u5de5\u8868\u65f6\u5728where\u5b50\u53e5\u4e2d\u4f7f\u7528in\u5173\u952e\u5b57\uff0c\u5224\u65ad\u5458\u5de5\u7684\u5de5\u4f5c\u5c97\u4f4d\u662f\u5b50\u67e5\u8be2\u5f97\u5230\u7684\u82e5\u5e72\u5c97\u4f4d\u4e2d\u7684\u4e00\u4e2a\uff0c\u5982\u679c\u662f\u5219\u7b26\u5408\u7b5b\u9009\u6761\u4ef6\uff0c\u7531\u4e8e\u8981\u6c42\u7b5b\u9009\u51fa\u6765\u7684\u5458\u5de5\u4e0d\u5305\u542b10\u53f7\u90e8\u95e8\u7684\uff0c\u56e0\u6b64\u8fd8\u9700\u8981\u5728where\u5b50\u53e5\u4e2d\u6307\u660e\u7b5b\u9009\u6761\u4ef6\u4e3a\u90e8\u95e8\u53f7\u4e0d\u7b49\u4e8e10\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/c9ad634e5eb340d3aebe3ea3bb23b827.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/c9ad634e5eb340d3aebe3ea3bb23b827.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>all\u5173\u952e\u5b57\uff1a\u663e\u793a\u5de5\u8d44\u6bd430\u53f7\u90e8\u95e8\u7684\u6240\u6709\u5458\u5de5\u7684\u5de5\u8d44\u9ad8\u7684\u5458\u5de5\u7684\u59d3\u540d\u3001\u5de5\u8d44\u548c\u90e8\u95e8\u53f7<\/p>\n<\/blockquote>\n\n\n\n<p>\u5148\u67e5\u8be230\u53f7\u90e8\u95e8\u5458\u5de5\u7684\u5de5\u8d44\uff0c\u5728\u67e5\u8be2\u65f6\u6700\u597d\u5bf9\u7ed3\u679c\u8fdb\u884c\u53bb\u91cd\uff0c\u56e0\u4e3a30\u53f7\u90e8\u95e8\u7684\u67d0\u4e9b\u5458\u5de5\u7684\u5de5\u8d44\u53ef\u80fd\u662f\u76f8\u540c\u7684\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/0ff1a3853e824ccbb1db4429ace95977.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/0ff1a3853e824ccbb1db4429ace95977.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<p>\u7136\u540e\u5c06\u4e0a\u8ff0\u67e5\u8be2\u4f5c\u4e3a\u5b50\u67e5\u8be2\uff0c\u5728\u67e5\u8be2\u5458\u5de5\u8868\u65f6\u5728where\u5b50\u53e5\u4e2d\u4f7f\u7528all\u5173\u952e\u5b57\uff0c\u5224\u65ad\u5458\u5de5\u7684\u5de5\u8d44\u662f\u5426\u9ad8\u4e8e\u5b50\u67e5\u8be2\u5f97\u5230\u7684\u6240\u6709\u5de5\u8d44\uff0c\u5982\u679c\u662f\u5219\u7b26\u5408\u7b5b\u9009\u6761\u4ef6\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/65fc61badba74aa7b45777da60dae2ba.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/65fc61badba74aa7b45777da60dae2ba.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<p>\u4f46\u5b9e\u9645\u8fd9\u9053\u9898\u4e5f\u7b49\u4ef7\u4e8e\u627e\u5230\u5de5\u8d44\u9ad8\u4e8e30\u53f7\u90e8\u95e8\u7684\u6700\u9ad8\u5de5\u8d44\u7684\u5458\u5de5\uff0c\u56e0\u6b64\u4e5f\u53ef\u4ee5\u4f7f\u7528\u5355\u884c\u5b50\u67e5\u8be2\u5f97\u523030\u53f7\u90e8\u95e8\u7684\u6700\u9ad8\u5de5\u8d44\uff0c\u7136\u540e\u5224\u65ad\u5458\u5de5\u7684\u5de5\u8d44\u662f\u5426\u9ad8\u4e8e\u5b50\u67e5\u8be2\u5f97\u5230\u7684\u6700\u9ad8\u5de5\u8d44\u5373\u53ef\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/2f0743d32f76469bae19b581557399a9.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/2f0743d32f76469bae19b581557399a9.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>any\u5173\u952e\u5b57\uff1a\u663e\u793a\u5de5\u8d44\u6bd430\u53f7\u90e8\u95e8\u7684\u4efb\u610f\u5458\u5de5\u7684\u5de5\u8d44\u9ad8\u7684\u5458\u5de5\u7684\u59d3\u540d\u3001\u5de5\u8d44\u548c\u90e8\u95e8\u53f7\uff0c\u5305\u542b30\u53f7\u90e8\u95e8\u7684\u5458\u5de5<\/p>\n<\/blockquote>\n\n\n\n<p>\u89e3\u51b3\u8be5\u9898\u76ee\u4e5f\u9700\u8981\u5148\u67e5\u8be230\u53f7\u90e8\u95e8\u5458\u5de5\u7684\u5de5\u8d44\uff0c\u7136\u540e\u5728\u67e5\u8be2\u5458\u5de5\u8868\u65f6\u5728where\u5b50\u53e5\u4e2d\u4f7f\u7528any\u5173\u952e\u5b57\uff0c\u5224\u65ad\u5458\u5de5\u7684\u5de5\u8d44\u662f\u5426\u9ad8\u4e8e\u5b50\u67e5\u8be2\u7684\u5f97\u5230\u7684\u5de5\u8d44\u4e2d\u7684\u67d0\u4e00\u4e2a\uff0c\u5982\u679c\u662f\u5219\u7b26\u5408\u7b5b\u9009\u6761\u4ef6\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/2e23a4e6dacc4ac1b830cd4251435dcf.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/2e23a4e6dacc4ac1b830cd4251435dcf.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<p>\u4f46\u5b9e\u9645\u8fd9\u9053\u9898\u4e5f\u7b49\u4ef7\u4e8e\u627e\u5230\u5de5\u8d44\u9ad8\u4e8e30\u53f7\u90e8\u95e8\u7684\u6700\u4f4e\u5de5\u8d44\u7684\u5458\u5de5\uff0c\u56e0\u6b64\u4e5f\u53ef\u4ee5\u4f7f\u7528\u5355\u884c\u5b50\u67e5\u8be2\u5f97\u523030\u53f7\u90e8\u95e8\u7684\u6700\u4f4e\u5de5\u8d44\uff0c\u7136\u540e\u5224\u65ad\u5458\u5de5\u7684\u5de5\u8d44\u662f\u5426\u9ad8\u4e8e\u5b50\u67e5\u8be2\u5f97\u5230\u7684\u6700\u4f4e\u5de5\u8d44\u5373\u53ef\uff0c\u7531\u4e8e\u8981\u6c42\u7b5b\u9009\u51fa\u6765\u7684\u5458\u5de5\u5305\u542b30\u53f7\u90e8\u95e8\u7684\uff0c\u56e0\u6b64\u4e0d\u9700\u8981\u518d\u5bf9\u90e8\u95e8\u53f7\u8fdb\u884c\u8fc7\u6ee4\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/5baff78194054e68945d4375b777455e.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/5baff78194054e68945d4375b777455e.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">\u591a\u5217\u5b50\u67e5\u8be2<\/h4>\n\n\n\n<p>\u591a\u5217\u5b50\u67e5\u8be2\uff0c\u662f\u6307\u8fd4\u56de\u591a\u5217\u6570\u636e\u7684\u5b50\u67e5\u8be2\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u663e\u793a\u548cSMITH\u7684\u90e8\u95e8\u548c\u5c97\u4f4d\u5b8c\u5168\u76f8\u540c\u7684\u5458\u5de5\uff0c\u4e0d\u5305\u542bSMITH\u672c\u4eba<\/p>\n<\/blockquote>\n\n\n\n<p>\u5148\u67e5\u8be2SMITH\u6240\u5728\u90e8\u95e8\u7684\u90e8\u95e8\u53f7\u548c\u4ed6\u7684\u5c97\u4f4d\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/ba97e6971c5f4c7490a0e0c9f4889627.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/ba97e6971c5f4c7490a0e0c9f4889627.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<p>\u7136\u540e\u5c06\u4e0a\u8ff0\u67e5\u8be2\u4f5c\u4e3a\u5b50\u67e5\u8be2\uff0c\u5728\u67e5\u8be2\u5458\u5de5\u8868\u65f6\u5728where\u5b50\u53e5\u4e2d\uff0c\u6307\u660e\u7b5b\u9009\u6761\u4ef6\u4e3a\u90e8\u95e8\u53f7\u548c\u5c97\u4f4d\u7b49\u4e8e\u5b50\u67e5\u8be2\u5f97\u5230\u7684\u90e8\u95e8\u53f7\u548c\u5c97\u4f4d\uff0c\u5e76\u4e14\u5458\u5de5\u7684\u59d3\u540d\u4e0d\u4e3aSMITH\u5373\u53ef\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/7ed632844b29480d891f1bb07efc45d4.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/7ed632844b29480d891f1bb07efc45d4.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<p><strong>\u8bf4\u660e\u4e00\u4e0b\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u591a\u5217\u5b50\u67e5\u8be2\u5f97\u5230\u7684\u7ed3\u679c\u662f\u591a\u5217\u6570\u636e\uff0c\u5728\u6bd4\u8f83\u591a\u5217\u6570\u636e\u65f6\u9700\u8981\u5c06\u5f85\u6bd4\u8f83\u7684\u591a\u4e2a\u5217\u7528\u5706\u62ec\u53f7\u62ec\u8d77\u6765\u3002<\/li>\n\n\n\n<li>\u591a\u5217\u5b50\u67e5\u8be2\u8fd4\u56de\u7684\u5982\u679c\u662f\u591a\u884c\u6570\u636e\uff0c\u5728\u7b5b\u9009\u6570\u636e\u65f6\u4e5f\u53ef\u4ee5\u4f7f\u7528in\u3001all\u548cany\u5173\u952e\u5b57\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u5728from\u5b50\u53e5\u4e2d\u4f7f\u7528\u5b50\u67e5\u8be2<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5b50\u67e5\u8be2\u8bed\u53e5\u4e0d\u4ec5\u53ef\u4ee5\u51fa\u73b0\u5728where\u5b50\u53e5\u4e2d\uff0c\u4e5f\u53ef\u4ee5\u51fa\u73b0\u5728from\u5b50\u53e5\u4e2d\u3002<\/li>\n\n\n\n<li>\u5b50\u67e5\u8be2\u8bed\u53e5\u51fa\u73b0from\u5b50\u53e5\u4e2d\uff0c\u5176\u67e5\u8be2\u7ed3\u679c\u5c06\u4f1a\u88ab\u5f53\u4f5c\u4e00\u4e2a\u4e34\u65f6\u8868\u4f7f\u7528\u3002<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u663e\u793a\u6bcf\u4e2a\u9ad8\u4e8e\u81ea\u5df1\u90e8\u95e8\u5e73\u5747\u5de5\u8d44\u7684\u5458\u5de5\u7684\u59d3\u540d\u3001\u90e8\u95e8\u3001\u5de5\u8d44\u548c\u90e8\u95e8\u7684\u5e73\u5747\u5de5\u8d44<\/p>\n<\/blockquote>\n\n\n\n<p>\u9996\u5148\u67e5\u8be2\u6bcf\u4e2a\u90e8\u95e8\u7684\u5e73\u5747\u5de5\u8d44\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/c24619dd05ea4000b7c61ed7b5c68b0d.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/c24619dd05ea4000b7c61ed7b5c68b0d.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<p>\u7531\u4e8e\u663e\u793a\u4fe1\u606f\u4e2d\u5305\u542b\u90e8\u95e8\u7684\u5e73\u5747\u5de5\u8d44\uff0c\u9700\u8981\u540c\u65f6\u4f7f\u7528\u5458\u5de5\u8868\u548c\u4e0a\u8ff0\u7684\u67e5\u8be2\u7ed3\u679c\u8fdb\u884c\u591a\u8868\u67e5\u8be2\uff0c\u8fd9\u65f6\u53ef\u4ee5\u5c06\u4e0a\u8ff0\u67e5\u8be2\u4f5c\u4e3a\u5b50\u67e5\u8be2\u653e\u5728from\u5b50\u53e5\u4e2d\uff0c\u7136\u540e\u5bf9\u5458\u5de5\u8868\u548c\u4e34\u65f6\u8868\u53d6\u7b1b\u5361\u5c14\u79ef\uff0c\u5728where\u5b50\u53e5\u4e2d\u6307\u660e\u7b5b\u9009\u6761\u4ef6\u4e3a\u5458\u5de5\u7684\u90e8\u95e8\u53f7\u7b49\u4e8e\u4e34\u65f6\u8868\u4e2d\u7684\u90e8\u95e8\u53f7\uff0c\u5e76\u4e14\u5458\u5de5\u7684\u5de5\u8d44\u5927\u4e8e\u4e34\u65f6\u8868\u4e2d\u7684\u5e73\u5747\u5de5\u8d44\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/215793a3d2924640b7d201d4c99ed81a.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/215793a3d2924640b7d201d4c99ed81a.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<p><strong>\u8bf4\u660e\u4e00\u4e0b\uff1a<\/strong> \u5728from\u5b50\u53e5\u4e2d\u4f7f\u7528\u5b50\u67e5\u8be2\u65f6\uff0c\u5fc5\u987b\u7ed9\u5b50\u67e5\u8be2\u5f97\u5230\u7684\u4e34\u65f6\u8868\u53d6\u4e00\u4e2a\u522b\u540d\uff0c\u5426\u5219\u67e5\u8be2\u5c06\u4f1a\u51fa\u9519\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u663e\u793a\u6bcf\u4e2a\u90e8\u95e8\u5de5\u8d44\u6700\u9ad8\u7684\u5458\u5de5\u7684\u59d3\u540d\u3001\u5de5\u8d44\u3001\u90e8\u95e8\u548c\u90e8\u95e8\u7684\u6700\u9ad8\u5de5\u8d44<\/p>\n<\/blockquote>\n\n\n\n<p>\u5148\u67e5\u8be2\u6bcf\u4e2a\u90e8\u95e8\u7684\u6700\u9ad8\u5de5\u8d44\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/02ec2d49a8394467a55685364186be84.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/02ec2d49a8394467a55685364186be84.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<p>\u5c06\u4e0a\u8ff0\u67e5\u8be2\u4f5c\u4e3a\u5b50\u67e5\u8be2\u653e\u5728from\u5b50\u53e5\u4e2d\uff0c\u7136\u540e\u5bf9\u5458\u5de5\u8868\u548c\u4e34\u65f6\u8868\u53d6\u7b1b\u5361\u5c14\u79ef\uff0c\u5728where\u5b50\u53e5\u4e2d\u6307\u660e\u7b5b\u9009\u6761\u4ef6\u4e3a\u5458\u5de5\u7684\u90e8\u95e8\u53f7\u7b49\u4e8e\u4e34\u65f6\u8868\u4e2d\u7684\u90e8\u95e8\u53f7\uff0c\u5e76\u4e14\u5458\u5de5\u7684\u5de5\u8d44\u7b49\u4e8e\u4e34\u65f6\u8868\u4e2d\u7684\u6700\u9ad8\u5de5\u8d44\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/7cbaa09be91a4808ab5c354f35b2d945.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/7cbaa09be91a4808ab5c354f35b2d945.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u663e\u793a\u6bcf\u4e2a\u90e8\u95e8\u7684\u90e8\u95e8\u53f7\u3001\u90e8\u95e8\u7f16\u53f7\u3001\u6240\u5728\u5730\u5740\u548c\u4eba\u5458\u6570\u91cf<\/p>\n<\/blockquote>\n\n\n\n<p>\u5728group by\u5b50\u53e5\u4e2d\u6307\u660e\u6309\u7167\u90e8\u95e8\u53f7\u8fdb\u884c\u5206\u7ec4\uff0c\u5206\u522b\u67e5\u8be2\u6bcf\u4e2a\u90e8\u95e8\u7684\u4eba\u5458\u6570\u91cf\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/931d86404bc04755b903405bbc702993.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/931d86404bc04755b903405bbc702993.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<p>\u5c06\u4e0a\u8ff0\u67e5\u8be2\u4f5c\u4e3a\u5b50\u67e5\u8be2\u653e\u5728from\u5b50\u53e5\u4e2d\uff0c\u7136\u540e\u5bf9\u5458\u5de5\u8868\u548c\u4e34\u65f6\u8868\u53d6\u7b1b\u5361\u5c14\u79ef\uff0c\u5728where\u5b50\u53e5\u4e2d\u6307\u660e\u7b5b\u9009\u6761\u4ef6\u4e3a\u5458\u5de5\u7684\u90e8\u95e8\u53f7\u7b49\u4e8e\u4e34\u65f6\u8868\u4e2d\u7684\u90e8\u95e8\u53f7\u5373\u53ef\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/023cc11e9e2f44c18fff8d29c4e61022.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/023cc11e9e2f44c18fff8d29c4e61022.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<p>\u6b64\u5916\uff0c\u9664\u4e86\u4e0a\u8ff0\u5b50\u67e5\u8be2+\u591a\u8868\u67e5\u8be2\u7684\u65b9\u5f0f\u5916\uff0c\u4e5f\u53ef\u4ee5\u53ea\u4f7f\u7528\u591a\u8868\u67e5\u8be2\u89e3\u51b3\u8be5\u95ee\u9898\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5148\u5bf9\u5458\u5de5\u8868\u548c\u90e8\u95e8\u8868\u53d6\u7b1b\u5361\u5c14\u79ef\u3002<\/li>\n\n\n\n<li>\u5728where\u5b50\u53e5\u4e2d\u6307\u660e\u7b5b\u9009\u6761\u4ef6\u4e3a\u5458\u5de5\u7684\u90e8\u95e8\u53f7\u7b49\u4e8e\u90e8\u95e8\u7684\u7f16\u53f7\uff0c\u7b5b\u9009\u51fa\u6709\u610f\u4e49\u7684\u8bb0\u5f55\u3002<\/li>\n\n\n\n<li>\u5728order by\u5b50\u53e5\u4e2d\u6307\u660e\u6309\u7167\u90e8\u95e8\u53f7\u8fdb\u884c\u5206\u7ec4\uff0c\u5206\u522b\u7edf\u8ba1\u51fa\u6bcf\u4e2a\u90e8\u95e8\u7684\u4eba\u6570\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/a9346dc211934d91a0113d58391c9009.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/a9346dc211934d91a0113d58391c9009.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<p>\u4f46\u7531\u4e8e\u9898\u76ee\u540c\u65f6\u8981\u6c42\u663e\u793a\u6bcf\u4e2a\u90e8\u95e8\u7684\u90e8\u95e8\u540d\u548c\u6240\u5728\u5730\u5740\uff0c\u56e0\u6b64\u5728group by\u5b50\u53e5\u4e2d\u9700\u8981\u6dfb\u52a0\u6309\u7167\u90e8\u95e8\u540d\u548c\u5730\u5740\u8fdb\u884c\u5206\u7ec4\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/af2ffc55301144adb12d71afaa087aff.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/af2ffc55301144adb12d71afaa087aff.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<p><strong>\u8bf4\u660e\u4e00\u4e0b\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u56e0\u4e3a\u5728select\u8bed\u53e5\u4e2d\u65b0\u589e\u4e86\u8981\u663e\u793a\u90e8\u95e8\u540d\u548c\u6240\u5728\u5730\u5740\uff0c\u56e0\u6b64\u9700\u8981\u5728group by\u5b50\u53e5\u4e2d\u4e5f\u6dfb\u52a0\u8fd9\u4e24\u4e2a\u5b57\u6bb5\uff0c\u8868\u660e\u5f53\u90e8\u95e8\u53f7\u76f8\u540c\u65f6\u6309\u7167\u90e8\u95e8\u540d\u8fdb\u884c\u5206\u7ec4\uff0c\u5f53\u90e8\u95e8\u540d\u4e5f\u76f8\u540c\u65f6\u7ee7\u7eed\u6309\u7167\u6240\u5728\u5730\u5740\u8fdb\u884c\u5206\u7ec4\u3002<\/li>\n\n\n\n<li>\u4f46\u5b9e\u9645\u5728\u4e0a\u8ff0\u573a\u666f\u4e2d\u90e8\u95e8\u53f7\u76f8\u540c\u7684\u8bb0\u5f55\uff0c\u5b83\u4eec\u7684\u90e8\u95e8\u540d\u548c\u6240\u5728\u5730\u5740\u4e5f\u4e00\u5b9a\u662f\u76f8\u540c\u7684\uff0c\u56e0\u6b64\u5728\u6211\u4eec\u770b\u6765group by\u4e2d\u7ee7\u7eed\u6dfb\u52a0\u8fd9\u4e24\u4e2a\u5b57\u6bb5\u6ca1\u4ec0\u4e48\u610f\u4e49\uff0c\u4f46MySQL\u8bed\u53e5\u8981\u6c42\u6211\u4eec\u5fc5\u987b\u6dfb\u52a0\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u5408\u5e76\u67e5\u8be2<\/h3>\n\n\n\n<p>\u5408\u5e76\u67e5\u8be2\uff0c\u662f\u6307\u5c06\u591a\u4e2a\u67e5\u8be2\u7ed3\u679c\u8fdb\u884c\u5408\u5e76\uff0c\u53ef\u4f7f\u7528\u7684\u64cd\u4f5c\u7b26\u6709union\u548cunion all\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>union\u7528\u4e8e\u53d6\u5f97\u4e24\u4e2a\u67e5\u8be2\u7ed3\u679c\u7684\u5e76\u96c6\uff0cunion\u4f1a\u81ea\u52a8\u53bb\u6389\u7ed3\u679c\u96c6\u4e2d\u7684\u91cd\u590d\u884c\u3002<\/li>\n\n\n\n<li>union all\u4e5f\u7528\u4e8e\u53d6\u5f97\u4e24\u4e2a\u67e5\u8be2\u7ed3\u679c\u7684\u5e76\u96c6\uff0c\u4f46union all\u4e0d\u4f1a\u53bb\u6389\u7ed3\u679c\u96c6\u4e2d\u7684\u91cd\u590d\u884c\u3002<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u663e\u793a\u5de5\u8d44\u5927\u4e8e2500\u6216\u804c\u4f4d\u662fMANAGER\u7684\u5458\u5de5<\/p>\n<\/blockquote>\n\n\n\n<p>\u67e5\u8be2\u5de5\u8d44\u5927\u4e8e2500\u7684\u5458\u5de5\u7684SQL\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/ef2df685930343fab4cd2b1f1122f260.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/ef2df685930343fab4cd2b1f1122f260.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" 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