{"id":76240,"date":"2024-10-16T05:01:13","date_gmt":"2024-10-15T21:01:13","guid":{"rendered":"https:\/\/server.hk\/cnblog\/76240\/"},"modified":"2024-10-16T05:01:13","modified_gmt":"2024-10-15T21:01:13","slug":"mysql%e5%85%a5%e9%96%80%ef%bc%9a%e4%bd%bf%e7%94%a8max%e5%87%bd%e6%95%b8%e8%bf%94%e5%9b%9e%e4%b8%80%e7%b5%84%e5%80%bc%e4%b8%ad%e7%9a%84%e6%9c%80%e5%a4%a7%e5%80%bc%e3%80%82","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/76240\/","title":{"rendered":"MySQL\u5165\u9580\uff1a\u4f7f\u7528MAX()\u51fd\u6578\u8fd4\u56de\u4e00\u7d44\u503c\u4e2d\u7684\u6700\u5927\u503c\u3002"},"content":{"rendered":"<h1 id=\"mysql%e5%85%a5%e9%96%80%ef%bc%9a%e4%bd%bf%e7%94%a8max%e5%87%bd%e6%95%b8%e8%bf%94%e5%9b%9e%e4%b8%80%e7%b5%84%e5%80%bc%e4%b8%ad%e7%9a%84%e6%9c%80%e5%a4%a7%e5%80%bc-MgttMDuoeJ\">MySQL\u5165\u9580\uff1a\u4f7f\u7528MAX()\u51fd\u6578\u8fd4\u56de\u4e00\u7d44\u503c\u4e2d\u7684\u6700\u5927\u503c<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cMySQL\u662f\u4e00\u500b\u975e\u5e38\u6d41\u884c\u7684\u9078\u64c7\uff0c\u56e0\u70ba\u5b83\u7684\u9ad8\u6548\u80fd\u548c\u9748\u6d3b\u6027\u3002\u5c0d\u65bc\u521d\u5b78\u8005\u4f86\u8aaa\uff0c\u4e86\u89e3\u5982\u4f55\u4f7f\u7528MySQL\u7684\u5404\u7a2e\u51fd\u6578\u662f\u975e\u5e38\u91cd\u8981\u7684\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662fMAX()\u51fd\u6578\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u6df1\u5165\u63a2\u8a0eMAX()\u51fd\u6578\u7684\u7528\u6cd5\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u969b\u7684\u7bc4\u4f8b\u4f86\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u9019\u500b\u51fd\u6578\u7684\u529f\u80fd\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afmax%e5%87%bd%e6%95%b8%ef%bc%9f-MgttMDuoeJ\">\u4ec0\u9ebc\u662fMAX()\u51fd\u6578\uff1f<\/h2>\n<p>MAX()\u51fd\u6578\u662f\u4e00\u500b\u805a\u5408\u51fd\u6578\uff0c\u7528\u65bc\u8fd4\u56de\u4e00\u7d44\u503c\u4e2d\u7684\u6700\u5927\u503c\u3002\u5b83\u53ef\u4ee5\u7528\u65bc\u6578\u5b57\u3001\u65e5\u671f\u548c\u5b57\u7b26\u4e32\u985e\u578b\u7684\u6578\u64da\u3002\u7576\u4f60\u9700\u8981\u5f9e\u4e00\u7d44\u6578\u64da\u4e2d\u627e\u51fa\u6700\u5927\u503c\u6642\uff0cMAX()\u51fd\u6578\u662f\u975e\u5e38\u6709\u7528\u7684\u3002<\/p>\n<h2 id=\"max%e5%87%bd%e6%95%b8%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-MgttMDuoeJ\">MAX()\u51fd\u6578\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<pre><code>SELECT MAX(column_name) FROM table_name WHERE condition;<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>column_name<\/code>\u662f\u4f60\u60f3\u8981\u67e5\u8a62\u7684\u5217\u540d\uff0c<code>table_name<\/code>\u662f\u6578\u64da\u8868\u7684\u540d\u7a31\uff0c\u800c<code>condition<\/code>\u662f\u53ef\u9078\u7684\u689d\u4ef6\uff0c\u7528\u65bc\u904e\u6ffe\u6578\u64da\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8max%e5%87%bd%e6%95%b8%e7%9a%84%e7%af%84%e4%be%8b-MgttMDuoeJ\">\u4f7f\u7528MAX()\u51fd\u6578\u7684\u7bc4\u4f8b<\/h2>\n<p>\u70ba\u4e86\u66f4\u597d\u5730\u7406\u89e3MAX()\u51fd\u6578\u7684\u7528\u6cd5\uff0c\u8b93\u6211\u5011\u8003\u616e\u4e00\u500b\u7c21\u55ae\u7684\u7bc4\u4f8b\u3002\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba<code>employees<\/code>\u7684\u6578\u64da\u8868\uff0c\u8a72\u8868\u5305\u542b\u4ee5\u4e0b\u5217\uff1a<\/p>\n<ul>\n<li><code>id<\/code> &#8211; \u54e1\u5de5ID<\/li>\n<li><code>name<\/code> &#8211; \u54e1\u5de5\u59d3\u540d<\/li>\n<li><code>salary<\/code> &#8211; \u54e1\u5de5\u85aa\u6c34<\/li>\n<\/ul>\n<p>\u5982\u679c\u6211\u5011\u60f3\u8981\u67e5\u8a62\u85aa\u6c34\u6700\u9ad8\u7684\u54e1\u5de5\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT MAX(salary) AS highest_salary FROM employees;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u8fd4\u56de<code>employees<\/code>\u8868\u4e2d\u85aa\u6c34\u7684\u6700\u5927\u503c\uff0c\u4e26\u5c07\u5176\u547d\u540d\u70ba<code>highest_salary<\/code>\u3002<\/p>\n<h2 id=\"%e7%b5%90%e5%90%88group-by%e4%bd%bf%e7%94%a8max%e5%87%bd%e6%95%b8-MgttMDuoeJ\">\u7d50\u5408GROUP BY\u4f7f\u7528MAX()\u51fd\u6578<\/h2>\n<p>MAX()\u51fd\u6578\u4e5f\u53ef\u4ee5\u8207<code>GROUP BY<\/code>\u5b50\u53e5\u4e00\u8d77\u4f7f\u7528\uff0c\u4ee5\u4fbf\u5728\u5206\u7d44\u7684\u57fa\u790e\u4e0a\u67e5\u8a62\u6700\u5927\u503c\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u60f3\u8981\u67e5\u8a62\u6bcf\u500b\u90e8\u9580\u4e2d\u85aa\u6c34\u6700\u9ad8\u7684\u54e1\u5de5\uff0c\u6211\u5011\u53ef\u4ee5\u9019\u6a23\u505a\uff1a<\/p>\n<pre><code>SELECT department, MAX(salary) AS highest_salary \nFROM employees \nGROUP BY department;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u8fd4\u56de\u6bcf\u500b\u90e8\u9580\u7684\u6700\u9ad8\u85aa\u6c34\uff0c\u4e26\u986f\u793a\u76f8\u61c9\u7684\u90e8\u9580\u540d\u7a31\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-MgttMDuoeJ\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528MAX()\u51fd\u6578\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>MAX()\u51fd\u6578\u53ea\u6703\u8fd4\u56de\u4e00\u500b\u503c\uff0c\u5373\u4f7f\u5728\u6709\u591a\u500b\u6700\u5927\u503c\u7684\u60c5\u6cc1\u4e0b\u3002<\/li>\n<li>\u5982\u679c\u67e5\u8a62\u7684\u5217\u5305\u542bNULL\u503c\uff0c\u9019\u4e9bNULL\u503c\u5c07\u88ab\u5ffd\u7565\u3002<\/li>\n<li>MAX()\u51fd\u6578\u53ef\u4ee5\u8207\u5176\u4ed6\u805a\u5408\u51fd\u6578\u4e00\u8d77\u4f7f\u7528\uff0c\u4f8b\u5982SUM()\u548cAVG()\uff0c\u4ee5\u4fbf\u9032\u884c\u66f4\u8907\u96dc\u7684\u67e5\u8a62\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-MgttMDuoeJ\">\u7e3d\u7d50<\/h2>\n<p>MAX()\u51fd\u6578\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u5e6b\u52a9\u7528\u6236\u5f9e\u6578\u64da\u96c6\u4e2d\u5feb\u901f\u627e\u51fa\u6700\u5927\u503c\u3002\u7121\u8ad6\u662f\u5728\u7c21\u55ae\u67e5\u8a62\u9084\u662f\u8907\u96dc\u7684\u5206\u7d44\u67e5\u8a62\u4e2d\uff0c\u9019\u500b\u51fd\u6578\u90fd\u80fd\u767c\u63ee\u91cd\u8981\u4f5c\u7528\u3002\u5c0d\u65bc\u5e0c\u671b\u6df1\u5165\u4e86\u89e3MySQL\u7684\u958b\u767c\u8005\u4f86\u8aaa\uff0c\u638c\u63e1MAX()\u51fd\u6578\u7684\u7528\u6cd5\u662f\u975e\u5e38\u5fc5\u8981\u7684\u3002<\/p>\n<p>\u5982\u679c\u4f60\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u6709\u8208\u8da3\uff0c\u4e26\u4e14\u9700\u8981\u7a69\u5b9a\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u904b\u884c\u4f60\u7684\u61c9\u7528\u7a0b\u5f0f\uff0cServer.HK \u63d0\u4f9b\u4e86\u591a\u7a2e\u9078\u64c7\uff0c\u9069\u5408\u4e0d\u540c\u9700\u6c42\u7684\u7528\u6236\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u4f60\u63d0\u4f9b\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5728MySQL\u4e2d\u4f7f\u7528MAX()\u51fd\u6578\uff0c\u8f15\u9b06\u8fd4\u56de\u4e00\u7d44\u503c\u4e2d\u7684\u6700\u5927\u503c\uff0c\u63d0\u5347\u6578\u64da\u67e5\u8a62\u6548\u7387\u8207\u6e96\u78ba\u6027\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-76240","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76240","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=76240"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76240\/revisions"}],"predecessor-version":[{"id":76241,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76240\/revisions\/76241"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=76240"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=76240"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=76240"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}