{"id":76284,"date":"2024-10-16T05:23:22","date_gmt":"2024-10-15T21:23:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/76284\/"},"modified":"2024-10-16T05:23:23","modified_gmt":"2024-10-15T21:23:23","slug":"mysql%e5%85%a5%e9%96%80%ef%bc%9a%e4%bd%bf%e7%94%a8where%e5%ad%90%e5%8f%a5%e5%9c%a8select%e8%aa%9e%e5%8f%a5%e4%b8%ad%e8%bf%87%e6%bf%be%e8%a1%8c%e3%80%82","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/76284\/","title":{"rendered":"MySQL\u5165\u9580\uff1a\u4f7f\u7528WHERE\u5b50\u53e5\u5728SELECT\u8a9e\u53e5\u4e2d\u8fc7\u6ffe\u884c\u3002"},"content":{"rendered":"<h1 id=\"mysql%e5%85%a5%e9%96%80%ef%bc%9a%e4%bd%bf%e7%94%a8where%e5%ad%90%e5%8f%a5%e5%9c%a8select%e8%aa%9e%e5%8f%a5%e4%b8%ad%e8%bf%87%e6%bf%be%e8%a1%8c-QsarGrMgLQ\">MySQL\u5165\u9580\uff1a\u4f7f\u7528WHERE\u5b50\u53e5\u5728SELECT\u8a9e\u53e5\u4e2d\u8fc7\u6ffe\u884c<\/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\u9748\u6d3b\u6027\u548c\u9ad8\u6548\u6027\u3002\u7576\u6211\u5011\u9700\u8981\u5f9e\u6578\u64da\u8868\u4e2d\u63d0\u53d6\u7279\u5b9a\u7684\u6578\u64da\u6642\uff0c<code>SELECT<\/code>\u8a9e\u53e5\u662f\u6700\u5e38\u7528\u7684\u5de5\u5177\u4e4b\u4e00\u3002\u800c\u5728\u9019\u500b\u904e\u7a0b\u4e2d\uff0c<code>WHERE<\/code>\u5b50\u53e5\u5247\u626e\u6f14\u8457\u81f3\u95dc\u91cd\u8981\u7684\u89d2\u8272\uff0c\u56e0\u70ba\u5b83\u80fd\u5920\u5e6b\u52a9\u6211\u5011\u904e\u6ffe\u51fa\u7b26\u5408\u7279\u5b9a\u689d\u4ef6\u7684\u884c\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u5982\u4f55\u4f7f\u7528<code>WHERE<\/code>\u5b50\u53e5\u4f86\u904e\u6ffe\u6578\u64da\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afwhere%e5%ad%90%e5%8f%a5%ef%bc%9f-QsarGrMgLQ\">\u4ec0\u9ebc\u662fWHERE\u5b50\u53e5\uff1f<\/h2>\n<p><code>WHERE<\/code>\u5b50\u53e5\u662f\u7528\u65bc\u6307\u5b9a\u67e5\u8a62\u689d\u4ef6\u7684\u90e8\u5206\u3002\u7576\u6211\u5011\u4f7f\u7528<code>SELECT<\/code>\u8a9e\u53e5\u5f9e\u6578\u64da\u8868\u4e2d\u6aa2\u7d22\u6578\u64da\u6642\uff0c<code>WHERE<\/code>\u5b50\u53e5\u53ef\u4ee5\u5e6b\u52a9\u6211\u5011\u9650\u5236\u8fd4\u56de\u7684\u884c\u6578\u3002\u9019\u6a23\uff0c\u6211\u5011\u5c31\u80fd\u5920\u7372\u5f97\u66f4\u7cbe\u78ba\u7684\u67e5\u8a62\u7d50\u679c\u3002<\/p>\n<h2 id=\"%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-QsarGrMgLQ\">\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>\u4f7f\u7528<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>column1, column2, ...<\/code>\u662f\u4f60\u60f3\u8981\u6aa2\u7d22\u7684\u5217\u540d\uff0c<code>table_name<\/code>\u662f\u6578\u64da\u8868\u7684\u540d\u7a31\uff0c\u800c<code>condition<\/code>\u5247\u662f\u904e\u6ffe\u689d\u4ef6\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8where%e5%ad%90%e5%8f%a5%e7%9a%84%e7%a4%ba%e4%be%8b-QsarGrMgLQ\">\u4f7f\u7528WHERE\u5b50\u53e5\u7684\u793a\u4f8b<\/h2>\n<h3 id=\"%e7%a4%ba%e4%be%8b1%ef%bc%9a%e5%9f%ba%e6%9c%ac%e6%a2%9d%e4%bb%b6%e9%81%8e%e6%bf%be-QsarGrMgLQ\">\u793a\u4f8b1\uff1a\u57fa\u672c\u689d\u4ef6\u904e\u6ffe<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba<code>employees<\/code>\u7684\u6578\u64da\u8868\uff0c\u5305\u542b\u4ee5\u4e0b\u5217\uff1a<code>id<\/code>\u3001<code>name<\/code>\u3001<code>age<\/code>\u548c<code>department<\/code>\u3002\u5982\u679c\u6211\u5011\u60f3\u8981\u67e5\u8a62\u6240\u6709\u5e74\u9f61\u5927\u65bc30\u7684\u54e1\u5de5\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT * \nFROM employees \nWHERE age &gt; 30;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u5e74\u9f61\u5927\u65bc30\u7684\u54e1\u5de5\u7684\u6240\u6709\u4fe1\u606f\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b2%ef%bc%9a%e5%a4%9a%e6%a2%9d%e4%bb%b6%e9%81%8e%e6%bf%be-QsarGrMgLQ\">\u793a\u4f8b2\uff1a\u591a\u689d\u4ef6\u904e\u6ffe<\/h3>\n<p>\u5982\u679c\u6211\u5011\u60f3\u8981\u67e5\u8a62\u5e74\u9f61\u5927\u65bc30\u4e14\u90e8\u9580\u70ba\u201c\u92b7\u552e\u201d\u7684\u54e1\u5de5\uff0c\u53ef\u4ee5\u4f7f\u7528<code>AND<\/code>\u904b\u7b97\u7b26\u4f86\u7d50\u5408\u591a\u500b\u689d\u4ef6\uff1a<\/p>\n<pre><code>SELECT * \nFROM employees \nWHERE age &gt; 30 AND department = '\u92b7\u552e';<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u67e5\u8a62\u5c07\u50c5\u8fd4\u56de\u5e74\u9f61\u5927\u65bc30\u4e14\u5728\u201c\u92b7\u552e\u201d\u90e8\u9580\u5de5\u4f5c\u7684\u54e1\u5de5\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b3%ef%bc%9a%e4%bd%bf%e7%94%a8or%e9%81%8b%e7%ae%97%e7%ac%a6-QsarGrMgLQ\">\u793a\u4f8b3\uff1a\u4f7f\u7528OR\u904b\u7b97\u7b26<\/h3>\n<p>\u5982\u679c\u6211\u5011\u60f3\u8981\u67e5\u8a62\u5e74\u9f61\u5c0f\u65bc25\u6216\u90e8\u9580\u70ba\u201c\u5e02\u5834\u201d\u7684\u54e1\u5de5\uff0c\u53ef\u4ee5\u4f7f\u7528<code>OR<\/code>\u904b\u7b97\u7b26\uff1a<\/p>\n<pre><code>SELECT * \nFROM employees \nWHERE age &lt; 25 OR department = '\u5e02\u5834';<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u5e74\u9f61\u5c0f\u65bc25\u7684\u54e1\u5de5\u4ee5\u53ca\u6240\u6709\u5728\u201c\u5e02\u5834\u201d\u90e8\u9580\u5de5\u4f5c\u7684\u54e1\u5de5\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8like%e9%80%b2%e8%a1%8c%e6%a8%a1%e7%b3%8a%e6%9f%a5%e8%a9%a2-QsarGrMgLQ\">\u4f7f\u7528LIKE\u9032\u884c\u6a21\u7cca\u67e5\u8a62<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u6211\u5011\u53ef\u80fd\u9700\u8981\u9032\u884c\u6a21\u7cca\u67e5\u8a62\u3002\u9019\u6642\u53ef\u4ee5\u4f7f\u7528<code>LIKE<\/code>\u904b\u7b97\u7b26\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u60f3\u67e5\u8a62\u6240\u6709\u540d\u5b57\u4ee5\u201cJ\u201d\u958b\u982d\u7684\u54e1\u5de5\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>SELECT * \nFROM employees \nWHERE name LIKE 'J%';<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u540d\u5b57\u4ee5\u201cJ\u201d\u958b\u982d\u7684\u54e1\u5de5\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-QsarGrMgLQ\">\u7d50\u8ad6<\/h2>\n<p>\u4f7f\u7528<code>WHERE<\/code>\u5b50\u53e5\u53ef\u4ee5\u6709\u6548\u5730\u904e\u6ffeMySQL\u67e5\u8a62\u4e2d\u7684\u6578\u64da\uff0c\u5e6b\u52a9\u7528\u6236\u7372\u5f97\u6240\u9700\u7684\u4fe1\u606f\u3002\u7121\u8ad6\u662f\u57fa\u672c\u7684\u689d\u4ef6\u904e\u6ffe\uff0c\u9084\u662f\u591a\u689d\u4ef6\u7684\u7d44\u5408\u67e5\u8a62\uff0c<code>WHERE<\/code>\u5b50\u53e5\u90fd\u80fd\u63d0\u4f9b\u5f37\u5927\u7684\u652f\u6301\u3002\u638c\u63e1\u9019\u4e9b\u57fa\u672c\u7528\u6cd5\u5f8c\uff0c\u60a8\u5c07\u80fd\u5920\u66f4\u9748\u6d3b\u5730\u64cd\u4f5c\u6578\u64da\u5eab\uff0c\u63d0\u5347\u6578\u64da\u67e5\u8a62\u7684\u6548\u7387\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u6216\u5176\u4ed6\u6280\u8853\u554f\u984c\u6709\u9032\u4e00\u6b65\u7684\u9700\u6c42\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u642d\u5efa\u60a8\u7684\u6578\u64da\u5eab\u74b0\u5883\uff0c\u4eab\u53d7\u9ad8\u6548\u7a69\u5b9a\u7684\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5728MySQL\u4e2d\u4f7f\u7528WHERE\u5b50\u53e5\u904e\u6ffeSELECT\u8a9e\u53e5\u7684\u884c\uff0c\u638c\u63e1\u6578\u64da\u67e5\u8a62\u7684\u57fa\u672c\u6280\u5de7\u8207\u5be6\u7528\u7bc4\u4f8b\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-76284","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76284","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=76284"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76284\/revisions"}],"predecessor-version":[{"id":76285,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76284\/revisions\/76285"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=76284"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=76284"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=76284"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}