{"id":160745,"date":"2024-11-04T00:39:33","date_gmt":"2024-11-03T16:39:33","guid":{"rendered":"https:\/\/server.hk\/cnblog\/160745\/"},"modified":"2024-11-04T00:39:34","modified_gmt":"2024-11-03T16:39:34","slug":"%e8%b3%87%e6%96%99%e5%ba%ab%e6%95%99%e7%a8%8b%ef%bc%9amysql-where%ef%bc%9a%e6%a2%9d%e4%bb%b6%e6%9f%a5%e8%a9%a2%e8%b3%87%e6%96%99","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/160745\/","title":{"rendered":"\u8cc7\u6599\u5eab\u6559\u7a0b\uff1aMySQL WHERE\uff1a\u689d\u4ef6\u67e5\u8a62\u8cc7\u6599"},"content":{"rendered":"<h1 id=\"%e8%b3%87%e6%96%99%e5%ba%ab%e6%95%99%e7%a8%8b%ef%bc%9amysql-where%ef%bc%9a%e6%a2%9d%e4%bb%b6%e6%9f%a5%e8%a9%a2%e8%b3%87%e6%96%99-cqNHwQGzNW\">\u8cc7\u6599\u5eab\u6559\u7a0b\uff1aMySQL WHERE\uff1a\u689d\u4ef6\u67e5\u8a62\u8cc7\u6599<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cMySQL \u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u958b\u6e90\u8cc7\u6599\u5eab\uff0c\u7279\u5225\u9069\u5408\u7528\u65bc\u7db2\u9801\u61c9\u7528\u7a0b\u5f0f\u3002MySQL \u63d0\u4f9b\u4e86\u591a\u7a2e\u67e5\u8a62\u8cc7\u6599\u7684\u65b9\u5f0f\uff0c\u5176\u4e2d\u6700\u5e38\u7528\u7684\u5c31\u662f\u4f7f\u7528 <code>WHERE<\/code> \u5b50\u53e5\u4f86\u9032\u884c\u689d\u4ef6\u67e5\u8a62\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e <code>WHERE<\/code> \u5b50\u53e5\u7684\u7528\u6cd5\u53ca\u5176\u5728\u8cc7\u6599\u67e5\u8a62\u4e2d\u7684\u91cd\u8981\u6027\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-where-%e5%ad%90%e5%8f%a5%ef%bc%9f-cqNHwQGzNW\">\u4ec0\u9ebc\u662f WHERE \u5b50\u53e5\uff1f<\/h2>\n<p><code>WHERE<\/code> \u5b50\u53e5\u662f SQL \u8a9e\u53e5\u4e2d\u7684\u4e00\u90e8\u5206\uff0c\u7528\u65bc\u6307\u5b9a\u67e5\u8a62\u4e2d\u6240\u9700\u7684\u689d\u4ef6\u3002\u5b83\u53ef\u4ee5\u7528\u65bc <code>SELECT<\/code>\u3001<code>UPDATE<\/code> \u548c <code>DELETE<\/code> \u8a9e\u53e5\u4e2d\uff0c\u4ee5\u904e\u6ffe\u51fa\u7b26\u5408\u7279\u5b9a\u689d\u4ef6\u7684\u8cc7\u6599\u884c\u3002\u4f7f\u7528 <code>WHERE<\/code> \u5b50\u53e5\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u7684\u6548\u7387\uff0c\u4e26\u4f7f\u7d50\u679c\u66f4\u5177\u91dd\u5c0d\u6027\u3002<\/p>\n<h2 id=\"where-%e5%ad%90%e5%8f%a5%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-cqNHwQGzNW\">WHERE \u5b50\u53e5\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>\u5728 MySQL \u4e2d\uff0c<code>WHERE<\/code> \u5b50\u53e5\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SELECT column1, column2, ...\nFROM table_name\nWHERE condition;<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>condition<\/code> \u662f\u7528\u4f86\u904e\u6ffe\u8cc7\u6599\u7684\u689d\u4ef6\uff0c\u53ef\u4ee5\u662f\u4efb\u4f55\u6709\u6548\u7684\u8868\u9054\u5f0f\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8-where-%e5%ad%90%e5%8f%a5%e7%9a%84%e7%af%84%e4%be%8b-cqNHwQGzNW\">\u4f7f\u7528 WHERE \u5b50\u53e5\u7684\u7bc4\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4f7f\u7528 <code>WHERE<\/code> \u5b50\u53e5\u7684\u7bc4\u4f8b\uff1a<\/p>\n<h3 id=\"1-%e5%9f%ba%e6%9c%ac%e6%9f%a5%e8%a9%a2-cqNHwQGzNW\">1. \u57fa\u672c\u67e5\u8a62<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>employees<\/code> \u7684\u8868\u683c\uff0c\u5305\u542b\u54e1\u5de5\u7684\u8cc7\u6599\u3002\u6211\u5011\u60f3\u67e5\u8a62\u6240\u6709\u5e74\u9f61\u5927\u65bc 30 \u6b72\u7684\u54e1\u5de5\uff1a<\/p>\n<pre><code>SELECT * FROM employees\nWHERE age &gt; 30;<\/code><\/pre>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8-and-%e5%92%8c-or-cqNHwQGzNW\">2. \u4f7f\u7528 AND \u548c OR<\/h3>\n<p>\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 <code>AND<\/code> \u548c <code>OR<\/code> \u4f86\u7d44\u5408\u591a\u500b\u689d\u4ef6\u3002\u4f8b\u5982\uff0c\u67e5\u8a62\u5e74\u9f61\u5927\u65bc 30 \u6b72\u4e14\u90e8\u9580\u70ba\u300c\u92b7\u552e\u300d\u7684\u54e1\u5de5\uff1a<\/p>\n<pre><code>SELECT * FROM employees\nWHERE age &gt; 30 AND department = 'Sales';<\/code><\/pre>\n<p>\u6216\u8005\u67e5\u8a62\u5e74\u9f61\u5c0f\u65bc 25 \u6b72\u6216\u90e8\u9580\u70ba\u300c\u5e02\u5834\u300d\u7684\u54e1\u5de5\uff1a<\/p>\n<pre><code>SELECT * FROM employees\nWHERE age &lt; 25 OR department = 'Marketing';<\/code><\/pre>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8-like-%e9%80%b2%e8%a1%8c%e6%a8%a1%e7%b3%8a%e6%9f%a5%e8%a9%a2-cqNHwQGzNW\">3. \u4f7f\u7528 LIKE \u9032\u884c\u6a21\u7cca\u67e5\u8a62<\/h3>\n<p>\u5982\u679c\u6211\u5011\u60f3\u67e5\u8a62\u540d\u5b57\u4ee5\u300cJ\u300d\u958b\u982d\u7684\u54e1\u5de5\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>LIKE<\/code> \u95dc\u9375\u5b57\uff1a<\/p>\n<pre><code>SELECT * FROM employees\nWHERE name LIKE 'J%';<\/code><\/pre>\n<h3 id=\"4-%e4%bd%bf%e7%94%a8-in-%e5%92%8c-between-cqNHwQGzNW\">4. \u4f7f\u7528 IN \u548c BETWEEN<\/h3>\n<p>\u4f7f\u7528 <code>IN<\/code> \u53ef\u4ee5\u67e5\u8a62\u591a\u500b\u503c\uff0c\u4f8b\u5982\u67e5\u8a62\u90e8\u9580\u70ba\u300c\u92b7\u552e\u300d\u6216\u300c\u5e02\u5834\u300d\u7684\u54e1\u5de5\uff1a<\/p>\n<pre><code>SELECT * FROM employees\nWHERE department IN ('Sales', 'Marketing');<\/code><\/pre>\n<p>\u800c\u4f7f\u7528 <code>BETWEEN<\/code> \u53ef\u4ee5\u67e5\u8a62\u5728\u67d0\u500b\u7bc4\u570d\u5167\u7684\u503c\uff0c\u4f8b\u5982\u67e5\u8a62\u5e74\u9f61\u5728 25 \u5230 35 \u6b72\u4e4b\u9593\u7684\u54e1\u5de5\uff1a<\/p>\n<pre><code>SELECT * FROM employees\nWHERE age BETWEEN 25 AND 35;<\/code><\/pre>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-cqNHwQGzNW\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528 <code>WHERE<\/code> \u5b50\u53e5\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u78ba\u4fdd\u689d\u4ef6\u7684\u6b63\u78ba\u6027\uff0c\u4ee5\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u932f\u8aa4\u3002<\/li>\n<li>\u4f7f\u7528\u9069\u7576\u7684\u8cc7\u6599\u985e\u578b\u9032\u884c\u6bd4\u8f03\uff0c\u4f8b\u5982\u6578\u5b57\u3001\u5b57\u4e32\u7b49\u3002<\/li>\n<li>\u5728\u8655\u7406\u5b57\u4e32\u6642\uff0c\u6ce8\u610f\u5927\u5c0f\u5beb\u654f\u611f\u6027\uff0c\u6839\u64da\u9700\u8981\u4f7f\u7528 <code>LOWER()<\/code> \u6216 <code>UPPER()<\/code> \u51fd\u6578\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-cqNHwQGzNW\">\u7e3d\u7d50<\/h2>\n<p>MySQL \u7684 <code>WHERE<\/code> \u5b50\u53e5\u662f\u9032\u884c\u8cc7\u6599\u67e5\u8a62\u7684\u91cd\u8981\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u6839\u64da\u7279\u5b9a\u689d\u4ef6\u904e\u6ffe\u8cc7\u6599\u3002\u7121\u8ad6\u662f\u57fa\u672c\u67e5\u8a62\u9084\u662f\u8907\u96dc\u7684\u689d\u4ef6\u7d44\u5408\uff0c<code>WHERE<\/code> \u5b50\u53e5\u90fd\u80fd\u63d0\u4f9b\u9748\u6d3b\u6027\u548c\u6548\u7387\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u8cc7\u6599\u7ba1\u7406\u7684\u61c9\u7528\u7a0b\u5f0f\u4f86\u8aaa\uff0c\u638c\u63e1 <code>WHERE<\/code> \u5b50\u53e5\u7684\u4f7f\u7528\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u53ef\u9760\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u5ba2\u6236\u3002\u7121\u8ad6\u662f\u500b\u4eba\u7db2\u7ad9\u9084\u662f\u4f01\u696d\u61c9\u7528\uff0c\u6211\u5011\u7684 <a href=\"https:\/\/server.hk\">\u4f3a\u670d\u5668<\/a> \u90fd\u80fd\u63d0\u4f9b\u7a69\u5b9a\u7684\u6027\u80fd\u548c\u5b89\u5168\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2MySQL WHERE\u5b50\u53e5\uff0c\u638c\u63e1\u689d\u4ef6\u67e5\u8a62\u8cc7\u6599\u7684\u6280\u5de7\uff0c\u63d0\u5347\u8cc7\u6599\u5eab\u64cd\u4f5c\u6548\u7387\uff0c\u8f15\u9b06\u7be9\u9078\u6240\u9700\u8cc7\u8a0a\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-160745","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160745","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=160745"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160745\/revisions"}],"predecessor-version":[{"id":160746,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160745\/revisions\/160746"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=160745"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=160745"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=160745"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}