{"id":188058,"date":"2024-11-11T19:26:19","date_gmt":"2024-11-11T11:26:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/188058\/"},"modified":"2024-11-11T19:26:20","modified_gmt":"2024-11-11T11:26:20","slug":"%e9%9b%99%e9%87%8d%e7%af%a9%e9%81%b8%ef%bc%9a%e7%b2%be%e6%ba%96%e6%9f%a5%e6%89%be%e6%95%b8%e6%93%9a%e5%ba%ab-%e5%b0%8d%e6%87%89%e5%85%a9%e5%80%8b%e6%a2%9d%e4%bb%b6%e6%9f%a5%e6%89%be%e7%9b%b8%e6%87%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/188058\/","title":{"rendered":"\u96d9\u91cd\u7be9\u9078\uff1a\u7cbe\u6e96\u67e5\u627e\u6578\u64da\u5eab (\u5c0d\u61c9\u5169\u500b\u689d\u4ef6\u67e5\u627e\u76f8\u61c9\u6578\u64da\u5eab)"},"content":{"rendered":"<h1 id=\"%e9%9b%99%e9%87%8d%e7%af%a9%e9%81%b8%ef%bc%9a%e7%b2%be%e6%ba%96%e6%9f%a5%e6%89%be%e6%95%b8%e6%93%9a%e5%ba%ab-%e5%b0%8d%e6%87%89%e5%85%a9%e5%80%8b%e6%a2%9d%e4%bb%b6%e6%9f%a5%e6%89%be%e7%9b%b8%e6%87%89-JWNOVkjqCX\">\u96d9\u91cd\u7be9\u9078\uff1a\u7cbe\u6e96\u67e5\u627e\u6578\u64da\u5eab (\u5c0d\u61c9\u5169\u500b\u689d\u4ef6\u67e5\u627e\u76f8\u61c9\u6578\u64da\u5eab)<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u7ba1\u7406\u548c\u67e5\u8a62\u8b8a\u5f97\u8d8a\u4f86\u8d8a\u91cd\u8981\u3002\u5c24\u5176\u662f\u5728\u9700\u8981\u6839\u64da\u591a\u500b\u689d\u4ef6\u9032\u884c\u67e5\u627e\u7684\u60c5\u6cc1\u4e0b\uff0c\u96d9\u91cd\u7be9\u9078\u6280\u8853\u986f\u5f97\u5c24\u70ba\u95dc\u9375\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728\u6578\u64da\u5eab\u4e2d\u5be6\u73fe\u96d9\u91cd\u7be9\u9078\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\uff0c\u4ee5\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u9019\u4e00\u904e\u7a0b\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e9%9b%99%e9%87%8d%e7%af%a9%e9%81%b8%ef%bc%9f-JWNOVkjqCX\">\u4ec0\u9ebc\u662f\u96d9\u91cd\u7be9\u9078\uff1f<\/h2>\n<p>\u96d9\u91cd\u7be9\u9078\u662f\u6307\u5728\u67e5\u8a62\u6578\u64da\u5eab\u6642\uff0c\u540c\u6642\u6839\u64da\u5169\u500b\u6216\u591a\u500b\u689d\u4ef6\u4f86\u904e\u6ffe\u6578\u64da\u3002\u9019\u7a2e\u65b9\u6cd5\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u7684\u7cbe\u78ba\u5ea6\uff0c\u4e26\u5e6b\u52a9\u7528\u6236\u5feb\u901f\u627e\u5230\u6240\u9700\u7684\u4fe1\u606f\u3002\u4f8b\u5982\uff0c\u5728\u4e00\u500b\u5305\u542b\u7528\u6236\u4fe1\u606f\u7684\u6578\u64da\u5eab\u4e2d\uff0c\u60a8\u53ef\u80fd\u5e0c\u671b\u6839\u64da\u7528\u6236\u7684\u5e74\u9f61\u548c\u5730\u5340\u4f86\u67e5\u627e\u7279\u5b9a\u7684\u7528\u6236\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e9%9c%80%e8%a6%81%e9%9b%99%e9%87%8d%e7%af%a9%e9%81%b8%ef%bc%9f-JWNOVkjqCX\">\u70ba\u4ec0\u9ebc\u9700\u8981\u96d9\u91cd\u7be9\u9078\uff1f<\/h2>\n<ul>\n<li><strong>\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\uff1a<\/strong>\u901a\u904e\u540c\u6642\u4f7f\u7528\u591a\u500b\u689d\u4ef6\uff0c\u53ef\u4ee5\u66f4\u5feb\u5730\u7e2e\u5c0f\u67e5\u8a62\u7bc4\u570d\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/li>\n<li><strong>\u589e\u5f37\u6578\u64da\u6e96\u78ba\u6027\uff1a<\/strong>\u96d9\u91cd\u7be9\u9078\u80fd\u5920\u66f4\u7cbe\u78ba\u5730\u5b9a\u4f4d\u5230\u7279\u5b9a\u6578\u64da\uff0c\u6e1b\u5c11\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u8fd4\u56de\u3002<\/li>\n<li><strong>\u652f\u6301\u8907\u96dc\u67e5\u8a62\uff1a<\/strong>\u5728\u8a31\u591a\u61c9\u7528\u5834\u666f\u4e2d\uff0c\u55ae\u4e00\u689d\u4ef6\u7684\u67e5\u8a62\u7121\u6cd5\u6eff\u8db3\u9700\u6c42\uff0c\u96d9\u91cd\u7be9\u9078\u63d0\u4f9b\u4e86\u66f4\u5927\u7684\u9748\u6d3b\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%af%a6%e7%8f%be%e9%9b%99%e9%87%8d%e7%af%a9%e9%81%b8%ef%bc%9f-JWNOVkjqCX\">\u5982\u4f55\u5be6\u73fe\u96d9\u91cd\u7be9\u9078\uff1f<\/h2>\n<p>\u5728\u5927\u591a\u6578\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u4e2d\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528 SQL \u8a9e\u53e5\u4f86\u5be6\u73fe\u96d9\u91cd\u7be9\u9078\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u5728 MySQL \u6578\u64da\u5eab\u4e2d\u6839\u64da\u5169\u500b\u689d\u4ef6\u67e5\u627e\u7528\u6236\u4fe1\u606f\uff1a<\/p>\n<pre><code>SELECT * FROM users \nWHERE age &gt; 18 AND region = 'Hong Kong';<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u67e5\u8a62\u4e86\u6240\u6709\u5e74\u9f61\u5927\u65bc 18 \u6b72\u4e14\u5c45\u4f4f\u5728\u9999\u6e2f\u7684\u7528\u6236\u3002\u9019\u6a23\u7684\u67e5\u8a62\u80fd\u5920\u6709\u6548\u5730\u904e\u6ffe\u51fa\u7b26\u5408\u689d\u4ef6\u7684\u6578\u64da\u3002<\/p>\n<h3 id=\"%e4%bd%bf%e7%94%a8-join-%e9%80%b2%e8%a1%8c%e9%9b%99%e9%87%8d%e7%af%a9%e9%81%b8-JWNOVkjqCX\">\u4f7f\u7528 JOIN \u9032\u884c\u96d9\u91cd\u7be9\u9078<\/h3>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u60a8\u53ef\u80fd\u9700\u8981\u5f9e\u591a\u500b\u8868\u4e2d\u67e5\u8a62\u6578\u64da\u3002\u9019\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528 JOIN \u8a9e\u53e5\u4f86\u5be6\u73fe\u96d9\u91cd\u7be9\u9078\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u5169\u500b\u8868\uff1a<code>users<\/code> \u548c <code>orders<\/code>\uff0c\u6211\u5011\u5e0c\u671b\u67e5\u627e\u6240\u6709\u5728\u7279\u5b9a\u5730\u5340\u4e0b\u8a02\u55ae\u7684\u7528\u6236\uff1a<\/p>\n<pre><code>SELECT u.* FROM users u\nJOIN orders o ON u.id = o.user_id\nWHERE u.region = 'Hong Kong' AND o.status = 'completed';<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u5728\u9999\u6e2f\u5730\u5340\u4e14\u8a02\u55ae\u72c0\u614b\u70ba\u201c\u5df2\u5b8c\u6210\u201d\u7684\u7528\u6236\u4fe1\u606f\u3002<\/p>\n<h2 id=\"%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-JWNOVkjqCX\">\u6700\u4f73\u5be6\u8e10<\/h2>\n<ul>\n<li><strong>\u4f7f\u7528\u7d22\u5f15\uff1a<\/strong>\u70ba\u7d93\u5e38\u67e5\u8a62\u7684\u5b57\u6bb5\u5efa\u7acb\u7d22\u5f15\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002<\/li>\n<li><strong>\u907f\u514d\u4f7f\u7528 SELECT *\uff1a<\/strong>\u50c5\u9078\u64c7\u9700\u8981\u7684\u5b57\u6bb5\uff0c\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u6578\u64da\u50b3\u8f38\u91cf\uff0c\u63d0\u9ad8\u6548\u7387\u3002<\/li>\n<li><strong>\u6e2c\u8a66\u67e5\u8a62\u6027\u80fd\uff1a<\/strong>\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0c\u5b9a\u671f\u6e2c\u8a66\u548c\u512a\u5316\u67e5\u8a62\u6027\u80fd\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-JWNOVkjqCX\">\u7d50\u8ad6<\/h2>\n<p>\u96d9\u91cd\u7be9\u9078\u662f\u4e00\u7a2e\u5f37\u5927\u7684\u6578\u64da\u67e5\u8a62\u6280\u8853\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u6839\u64da\u591a\u500b\u689d\u4ef6\u7cbe\u78ba\u67e5\u627e\u6240\u9700\u6578\u64da\u3002\u901a\u904e\u5408\u7406\u4f7f\u7528 SQL \u8a9e\u53e5\u548c\u6700\u4f73\u5be6\u8e10\uff0c\u60a8\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u6578\u64da\u67e5\u8a62\u7684\u6548\u7387\u548c\u6e96\u78ba\u6027\u3002\u7121\u8ad6\u662f\u5728\u958b\u767c\u61c9\u7528\u7a0b\u5e8f\u9084\u662f\u9032\u884c\u6578\u64da\u5206\u6790\u6642\uff0c\u638c\u63e1\u96d9\u91cd\u7be9\u9078\u7684\u6280\u5de7\u90fd\u662f\u975e\u5e38\u6709\u76ca\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u548c\u67e5\u8a62\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\u66f4\u9ad8\u7684\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u96d9\u91cd\u7be9\u9078\u529f\u80fd\u8b93\u60a8\u6839\u64da\u5169\u500b\u689d\u4ef6\u7cbe\u6e96\u67e5\u627e\u6578\u64da\u5eab\uff0c\u5feb\u901f\u7372\u53d6\u6240\u9700\u4fe1\u606f\uff0c\u63d0\u5347\u6578\u64da\u6aa2\u7d22\u6548\u7387\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-188058","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188058","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=188058"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188058\/revisions"}],"predecessor-version":[{"id":188059,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188058\/revisions\/188059"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=188058"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=188058"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=188058"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}