{"id":175409,"date":"2024-11-08T05:38:17","date_gmt":"2024-11-07T21:38:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/175409\/"},"modified":"2024-11-08T05:38:18","modified_gmt":"2024-11-07T21:38:18","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8sql%e6%9f%a5%e8%a9%a2%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e5%85%a9%e5%80%8b%e5%ad%97%e6%ae%b5%e7%9a%84%e6%95%b8%e6%93%9a%ef%bc%88%e6%95%b8%e6%93%9a%e5%ba%ab","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/175409\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528SQL\u67e5\u8a62\u6578\u64da\u5eab\u4e2d\u5169\u500b\u5b57\u6bb5\u7684\u6578\u64da\uff08\u6578\u64da\u5eab\u4e2d\u67e5\u8a62\u5169\u500b\u5b57\u6bb5\u600e\u9ebc\u67e5\u8a62\u6578\u64da\uff09"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8sql%e6%9f%a5%e8%a9%a2%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e5%85%a9%e5%80%8b%e5%ad%97%e6%ae%b5%e7%9a%84%e6%95%b8%e6%93%9a-GqwRbtPiwy\">\u5982\u4f55\u4f7f\u7528SQL\u67e5\u8a62\u6578\u64da\u5eab\u4e2d\u5169\u500b\u5b57\u6bb5\u7684\u6578\u64da<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u4e00\u7a2e\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5f9e\u6578\u64da\u5eab\u4e2d\u63d0\u53d6\u6240\u9700\u7684\u4fe1\u606f\u3002\u7576\u9700\u8981\u67e5\u8a62\u6578\u64da\u5eab\u4e2d\u5169\u500b\u5b57\u6bb5\u7684\u6578\u64da\u6642\uff0c\u4f7f\u7528SQL\u8a9e\u53e5\u53ef\u4ee5\u6709\u6548\u5730\u9054\u6210\u9019\u4e00\u76ee\u6a19\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u4f7f\u7528SQL\u67e5\u8a62\u5169\u500b\u5b57\u6bb5\u7684\u6578\u64da\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-GqwRbtPiwy\">\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u5728SQL\u4e2d\uff0c\u67e5\u8a62\u6578\u64da\u7684\u57fa\u672c\u8a9e\u6cd5\u662f\u4f7f\u7528SELECT\u8a9e\u53e5\u3002\u7576\u6211\u5011\u9700\u8981\u67e5\u8a62\u591a\u500b\u5b57\u6bb5\u6642\uff0c\u53ef\u4ee5\u5728SELECT\u8a9e\u53e5\u4e2d\u6307\u5b9a\u9019\u4e9b\u5b57\u6bb5\u3002\u4ee5\u4e0b\u662f\u57fa\u672c\u7684\u8a9e\u6cd5\u7d50\u69cb\uff1a<\/p>\n<pre><code>SELECT field1, field2 FROM table_name WHERE condition;<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>field1<\/code>\u548c<code>field2<\/code>\u662f\u6211\u5011\u60f3\u8981\u67e5\u8a62\u7684\u5b57\u6bb5\u540d\uff0c<code>table_name<\/code>\u662f\u6578\u64da\u8868\u7684\u540d\u7a31\uff0c\u800c<code>condition<\/code>\u5247\u662f\u7528\u4f86\u904e\u6ffe\u6578\u64da\u7684\u689d\u4ef6\u3002<\/p>\n<h2 id=\"%e6%9f%a5%e8%a9%a2%e7%a4%ba%e4%be%8b-GqwRbtPiwy\">\u67e5\u8a62\u793a\u4f8b<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba<code>employees<\/code>\u7684\u6578\u64da\u8868\uff0c\u8a72\u8868\u5305\u542b\u4ee5\u4e0b\u5b57\u6bb5\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>department<\/code> &#8211; \u90e8\u9580<\/li>\n<li><code>salary<\/code> &#8211; \u85aa\u6c34<\/li>\n<\/ul>\n<p>\u5982\u679c\u6211\u5011\u60f3\u8981\u67e5\u8a62\u6240\u6709\u54e1\u5de5\u7684\u59d3\u540d\u548c\u85aa\u6c34\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT name, salary FROM employees;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u8fd4\u56de\u6240\u6709\u54e1\u5de5\u7684\u59d3\u540d\u548c\u85aa\u6c34\u4fe1\u606f\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e6%a2%9d%e4%bb%b6%e9%81%8e%e6%bf%be%e6%95%b8%e6%93%9a-GqwRbtPiwy\">\u4f7f\u7528\u689d\u4ef6\u904e\u6ffe\u6578\u64da<\/h2>\n<p>\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0c\u6211\u5011\u7d93\u5e38\u9700\u8981\u6839\u64da\u7279\u5b9a\u689d\u4ef6\u4f86\u904e\u6ffe\u67e5\u8a62\u7d50\u679c\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u53ea\u60f3\u67e5\u8a62\u85aa\u6c34\u9ad8\u65bc50000\u7684\u54e1\u5de5\u59d3\u540d\u548c\u85aa\u6c34\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>SELECT name, salary FROM employees WHERE salary &gt; 50000;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u50c5\u8fd4\u56de\u85aa\u6c34\u9ad8\u65bc50000\u7684\u54e1\u5de5\u7684\u59d3\u540d\u548c\u85aa\u6c34\u3002<\/p>\n<h2 id=\"%e8%81%af%e6%8e%a5%e6%9f%a5%e8%a9%a2-GqwRbtPiwy\">\u806f\u63a5\u67e5\u8a62<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u6211\u5011\u53ef\u80fd\u9700\u8981\u5f9e\u591a\u500b\u8868\u4e2d\u67e5\u8a62\u6578\u64da\u3002\u9019\u6642\u53ef\u4ee5\u4f7f\u7528\u806f\u63a5\uff08JOIN\uff09\u4f86\u5be6\u73fe\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u9084\u6709\u4e00\u500b\u540d\u70ba<code>departments<\/code>\u7684\u8868\uff0c\u8a72\u8868\u5305\u542b\u90e8\u9580\u7684\u8a73\u7d30\u4fe1\u606f\uff1a<\/p>\n<ul>\n<li><code>id<\/code> &#8211; \u90e8\u9580ID<\/li>\n<li><code>name<\/code> &#8211; \u90e8\u9580\u540d\u7a31<\/li>\n<\/ul>\n<p>\u5982\u679c\u6211\u5011\u60f3\u8981\u67e5\u8a62\u6bcf\u4f4d\u54e1\u5de5\u7684\u59d3\u540d\u53ca\u5176\u6240\u5c6c\u90e8\u9580\u540d\u7a31\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT employees.name, departments.name \nFROM employees \nJOIN departments ON employees.department = departments.id;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u8fd4\u56de\u6bcf\u4f4d\u54e1\u5de5\u7684\u59d3\u540d\u53ca\u5176\u6240\u5c6c\u90e8\u9580\u7684\u540d\u7a31\uff0c\u901a\u904e<code>JOIN<\/code>\u8a9e\u53e5\u5c07\u5169\u500b\u8868\u806f\u63a5\u5728\u4e00\u8d77\u3002<\/p>\n<h2 id=\"%e5%b0%8f%e7%b5%90-GqwRbtPiwy\">\u5c0f\u7d50<\/h2>\n<p>\u4f7f\u7528SQL\u67e5\u8a62\u6578\u64da\u5eab\u4e2d\u5169\u500b\u5b57\u6bb5\u7684\u6578\u64da\u662f\u4e00\u500b\u57fa\u672c\u800c\u91cd\u8981\u7684\u6280\u80fd\u3002\u901a\u904e\u638c\u63e1SELECT\u8a9e\u53e5\u7684\u57fa\u672c\u7528\u6cd5\u3001\u689d\u4ef6\u904e\u6ffe\u4ee5\u53ca\u806f\u63a5\u67e5\u8a62\uff0c\u60a8\u53ef\u4ee5\u6709\u6548\u5730\u5f9e\u6578\u64da\u5eab\u4e2d\u63d0\u53d6\u6240\u9700\u7684\u4fe1\u606f\u3002\u7121\u8ad6\u662f\u5728\u6578\u64da\u5206\u6790\u3001\u5831\u544a\u751f\u6210\u9084\u662f\u61c9\u7528\u958b\u767c\u4e2d\uff0c\u9019\u4e9b\u6280\u80fd\u90fd\u5c07\u5927\u6709\u5e6b\u52a9\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>\u670d\u52d9\u4f86\u642d\u5efa\u60a8\u7684\u6578\u64da\u5eab\u74b0\u5883\uff0c\u4eab\u53d7\u7a69\u5b9a\u548c\u9ad8\u6548\u7684\u6027\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u4f7f\u7528SQL\u67e5\u8a62\u6578\u64da\u5eab\u4e2d\u5169\u500b\u5b57\u6bb5\u7684\u6578\u64da\uff0c\u638c\u63e1\u57fa\u672c\u8a9e\u6cd5\u548c\u6280\u5de7\uff0c\u8f15\u9b06\u7372\u53d6\u6240\u9700\u4fe1\u606f\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-175409","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/175409","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=175409"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/175409\/revisions"}],"predecessor-version":[{"id":175410,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/175409\/revisions\/175410"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=175409"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=175409"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=175409"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}