{"id":157932,"date":"2024-11-03T00:08:20","date_gmt":"2024-11-02T16:08:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/157932\/"},"modified":"2024-11-03T00:08:21","modified_gmt":"2024-11-02T16:08:21","slug":"%e9%ab%98%e6%95%88%e6%9b%b4%e6%96%b0%e6%95%b8%e6%93%9a%e5%ba%ab%ef%bc%8c%e6%8e%8c%e6%8f%a1%e9%ab%98%e7%b4%9a%e7%af%a9%e9%81%b8%e6%8a%80%e5%b7%a7%ef%bc%88%e9%ab%98%e7%b4%9a%e7%af%a9%e9%81%b8%e6%9b%b4","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/157932\/","title":{"rendered":"\u9ad8\u6548\u66f4\u65b0\u6578\u64da\u5eab\uff0c\u638c\u63e1\u9ad8\u7d1a\u7be9\u9078\u6280\u5de7\uff08\u9ad8\u7d1a\u7be9\u9078\u66f4\u65b0\u6578\u64da\u5eab\uff09"},"content":{"rendered":"<h1 id=\"%e9%ab%98%e6%95%88%e6%9b%b4%e6%96%b0%e6%95%b8%e6%93%9a%e5%ba%ab%ef%bc%8c%e6%8e%8c%e6%8f%a1%e9%ab%98%e7%b4%9a%e7%af%a9%e9%81%b8%e6%8a%80%e5%b7%a7%ef%bc%88%e9%ab%98%e7%b4%9a%e7%af%a9%e9%81%b8%e6%9b%b4-MUVwyDgUvR\">\u9ad8\u6548\u66f4\u65b0\u6578\u64da\u5eab\uff0c\u638c\u63e1\u9ad8\u7d1a\u7be9\u9078\u6280\u5de7\uff08\u9ad8\u7d1a\u7be9\u9078\u66f4\u65b0\u6578\u64da\u5eab\uff09<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u7ba1\u7406\u548c\u66f4\u65b0\u8b8a\u5f97\u8d8a\u4f86\u8d8a\u91cd\u8981\u3002\u7121\u8ad6\u662f\u4f01\u696d\u9084\u662f\u500b\u4eba\u7528\u6236\uff0c\u80fd\u5920\u9ad8\u6548\u5730\u66f4\u65b0\u6578\u64da\u5eab\u4e26\u904b\u7528\u9ad8\u7d1a\u7be9\u9078\u6280\u5de7\uff0c\u90fd\u662f\u63d0\u5347\u5de5\u4f5c\u6548\u7387\u7684\u95dc\u9375\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u9ad8\u6548\u66f4\u65b0\u6578\u64da\u5eab\uff0c\u4e26\u4ecb\u7d39\u4e00\u4e9b\u9ad8\u7d1a\u7be9\u9078\u6280\u5de7\uff0c\u5e6b\u52a9\u7528\u6236\u66f4\u597d\u5730\u7ba1\u7406\u548c\u5229\u7528\u6578\u64da\u3002<\/p>\n<h2 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9b%b4%e6%96%b0%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-MUVwyDgUvR\">\u6578\u64da\u5eab\u66f4\u65b0\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u6578\u64da\u5eab\u66f4\u65b0\u662f\u6307\u5c0d\u6578\u64da\u5eab\u4e2d\u73fe\u6709\u6578\u64da\u9032\u884c\u4fee\u6539\u3001\u522a\u9664\u6216\u65b0\u589e\u7684\u904e\u7a0b\u3002\u9019\u4e00\u904e\u7a0b\u901a\u5e38\u6d89\u53ca\u5230SQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u8a9e\u53e5\u7684\u4f7f\u7528\u3002\u5e38\u898b\u7684\u66f4\u65b0\u64cd\u4f5c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><code>UPDATE<\/code>\uff1a\u7528\u65bc\u4fee\u6539\u73fe\u6709\u8a18\u9304\u3002<\/li>\n<li><code>INSERT<\/code>\uff1a\u7528\u65bc\u65b0\u589e\u8a18\u9304\u3002<\/li>\n<li><code>DELETE<\/code>\uff1a\u7528\u65bc\u522a\u9664\u8a18\u9304\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u66f4\u65b0\u67d0\u500b\u7528\u6236\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/p>\n<pre><code>UPDATE users SET email = 'newemail@example.com' WHERE id = 1;<\/code><\/pre>\n<h2 id=\"%e9%ab%98%e7%b4%9a%e7%af%a9%e9%81%b8%e6%8a%80%e5%b7%a7-MUVwyDgUvR\">\u9ad8\u7d1a\u7be9\u9078\u6280\u5de7<\/h2>\n<p>\u5728\u6578\u64da\u5eab\u4e2d\uff0c\u7be9\u9078\u662f\u6307\u6839\u64da\u7279\u5b9a\u689d\u4ef6\u9078\u64c7\u6578\u64da\u7684\u904e\u7a0b\u3002\u9ad8\u7d1a\u7be9\u9078\u6280\u5de7\u53ef\u4ee5\u5e6b\u52a9\u7528\u6236\u66f4\u7cbe\u78ba\u5730\u67e5\u8a62\u548c\u66f4\u65b0\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u7684\u9ad8\u7d1a\u7be9\u9078\u6280\u5de7\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8%e8%a4%87%e9%9b%9c%e7%9a%84%e6%a2%9d%e4%bb%b6-MUVwyDgUvR\">1. \u4f7f\u7528\u8907\u96dc\u7684\u689d\u4ef6<\/h3>\n<p>\u5728\u9032\u884c\u7be9\u9078\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528\u591a\u500b\u689d\u4ef6\u4f86\u7cbe\u78ba\u67e5\u8a62\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u67e5\u8a62\u5e74\u9f61\u572818\u523030\u6b72\u4e4b\u9593\u4e14\u5c45\u4f4f\u5728\u9999\u6e2f\u7684\u7528\u6236\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT * FROM users WHERE age BETWEEN 18 AND 30 AND city = 'Hong Kong';<\/code><\/pre>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8%e5%ad%90%e6%9f%a5%e8%a9%a2-MUVwyDgUvR\">2. \u4f7f\u7528\u5b50\u67e5\u8a62<\/h3>\n<p>\u5b50\u67e5\u8a62\u662f\u6307\u5728\u4e00\u500b\u67e5\u8a62\u4e2d\u5d4c\u5957\u53e6\u4e00\u500b\u67e5\u8a62\u3002\u9019\u7a2e\u65b9\u6cd5\u53ef\u4ee5\u7528\u4f86\u9032\u884c\u66f4\u8907\u96dc\u7684\u7be9\u9078\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u67e5\u8a62\u6240\u6709\u8a02\u55ae\u91d1\u984d\u8d85\u904e\u5e73\u5747\u503c\u7684\u7528\u6236\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT * FROM users WHERE id IN (SELECT user_id FROM orders WHERE amount &gt; (SELECT AVG(amount) FROM orders));<\/code><\/pre>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8join%e6%93%8d%e4%bd%9c-MUVwyDgUvR\">3. \u4f7f\u7528JOIN\u64cd\u4f5c<\/h3>\n<p>JOIN\u64cd\u4f5c\u53ef\u4ee5\u5c07\u591a\u500b\u8868\u4e2d\u7684\u6578\u64da\u7d50\u5408\u8d77\u4f86\uff0c\u5f9e\u800c\u9032\u884c\u66f4\u5168\u9762\u7684\u7be9\u9078\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u67e5\u8a62\u6240\u6709\u4e0b\u904e\u8a02\u55ae\u7684\u7528\u6236\u53ca\u5176\u8a02\u55ae\u91d1\u984d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT users.name, orders.amount FROM users JOIN orders ON users.id = orders.user_id;<\/code><\/pre>\n<h2 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9b%b4%e6%96%b0%e7%9a%84%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-MUVwyDgUvR\">\u6578\u64da\u5eab\u66f4\u65b0\u7684\u6700\u4f73\u5be6\u8e10<\/h2>\n<p>\u5728\u9032\u884c\u6578\u64da\u5eab\u66f4\u65b0\u6642\uff0c\u9075\u5faa\u4e00\u4e9b\u6700\u4f73\u5be6\u8e10\u53ef\u4ee5\u63d0\u9ad8\u6548\u7387\u4e26\u6e1b\u5c11\u932f\u8aa4\uff1a<\/p>\n<ul>\n<li><strong>\u5099\u4efd\u6578\u64da\uff1a<\/strong>\u5728\u9032\u884c\u4efb\u4f55\u66f4\u65b0\u4e4b\u524d\uff0c\u52d9\u5fc5\u5099\u4efd\u6578\u64da\uff0c\u4ee5\u9632\u6b62\u610f\u5916\u4e1f\u5931\u3002<\/li>\n<li><strong>\u4f7f\u7528\u4e8b\u52d9\uff1a<\/strong>\u5728\u9032\u884c\u591a\u500b\u66f4\u65b0\u64cd\u4f5c\u6642\uff0c\u4f7f\u7528\u4e8b\u52d9\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002<\/li>\n<li><strong>\u6e2c\u8a66\u66f4\u65b0\uff1a<\/strong>\u5728\u751f\u7522\u74b0\u5883\u4e2d\u9032\u884c\u66f4\u65b0\u4e4b\u524d\uff0c\u61c9\u5728\u6e2c\u8a66\u74b0\u5883\u4e2d\u9032\u884c\u5145\u5206\u6e2c\u8a66\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-MUVwyDgUvR\">\u7d50\u8ad6<\/h2>\n<p>\u9ad8\u6548\u66f4\u65b0\u6578\u64da\u5eab\u548c\u638c\u63e1\u9ad8\u7d1a\u7be9\u9078\u6280\u5de7\u662f\u6578\u64da\u7ba1\u7406\u4e2d\u7684\u91cd\u8981\u6280\u80fd\u3002\u901a\u904e\u4f7f\u7528\u8907\u96dc\u7684\u689d\u4ef6\u3001\u5b50\u67e5\u8a62\u548cJOIN\u64cd\u4f5c\uff0c\u7528\u6236\u53ef\u4ee5\u66f4\u7cbe\u78ba\u5730\u67e5\u8a62\u548c\u66f4\u65b0\u6578\u64da\u3002\u6b64\u5916\uff0c\u9075\u5faa\u6700\u4f73\u5be6\u8e10\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u5b89\u5168\u6027\u548c\u4e00\u81f4\u6027\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u7ba1\u7406\u7684\u7528\u6236\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u81f3\u95dc\u91cd\u8981\u3002\u82e5\u60a8\u5c0d\u65bc<code>VPS<\/code>\u3001<code>\u9999\u6e2fVPS<\/code>\u6216\u5176\u4ed6<code>\u4e91\u670d\u52a1\u5668<\/code>\u89e3\u6c7a\u65b9\u6848\u611f\u8208\u8da3\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9 <a href=\"https:\/\/server.hk\">Server.HK<\/a> \u7372\u53d6\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u638c\u63e1\u9ad8\u7d1a\u7be9\u9078\u6280\u5de7\uff0c\u5feb\u901f\u9ad8\u6548\u66f4\u65b0\u6578\u64da\u5eab\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u80fd\u529b\uff0c\u512a\u5316\u5de5\u4f5c\u6d41\u7a0b\uff0c\u5be6\u73fe\u7cbe\u6e96\u6578\u64da\u5206\u6790\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-157932","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/157932","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=157932"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/157932\/revisions"}],"predecessor-version":[{"id":157933,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/157932\/revisions\/157933"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=157932"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=157932"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=157932"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}