{"id":183378,"date":"2024-11-10T04:19:18","date_gmt":"2024-11-09T20:19:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/183378\/"},"modified":"2024-11-10T04:19:18","modified_gmt":"2024-11-09T20:19:18","slug":"%e5%af%a6%e7%8f%be%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9f%a5%e8%a9%a2%e5%84%aa%e5%8c%96%ef%bc%9a%e9%80%a3%e6%8e%a5%e5%85%a9%e5%80%8b%e5%ad%97%e6%ae%b5%e7%9a%84%e6%9f%a5%e8%a9%a2%e6%8a%80%e5%b7%a7-%e6%95%b8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/183378\/","title":{"rendered":"\u5be6\u73fe\u6578\u64da\u5eab\u67e5\u8a62\u512a\u5316\uff1a\u9023\u63a5\u5169\u500b\u5b57\u6bb5\u7684\u67e5\u8a62\u6280\u5de7 (\u6578\u64da\u5eab\u67e5\u8a62\u9023\u63a5\u5169\u500b\u5b57\u6bb5)"},"content":{"rendered":"<h1 id=\"%e5%af%a6%e7%8f%be%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9f%a5%e8%a9%a2%e5%84%aa%e5%8c%96%ef%bc%9a%e9%80%a3%e6%8e%a5%e5%85%a9%e5%80%8b%e5%ad%97%e6%ae%b5%e7%9a%84%e6%9f%a5%e8%a9%a2%e6%8a%80%e5%b7%a7-aryXtJjvmr\">\u5be6\u73fe\u6578\u64da\u5eab\u67e5\u8a62\u512a\u5316\uff1a\u9023\u63a5\u5169\u500b\u5b57\u6bb5\u7684\u67e5\u8a62\u6280\u5de7<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u6027\u80fd\u5c0d\u65bc\u61c9\u7528\u7a0b\u5e8f\u7684\u6574\u9ad4\u6548\u7387\u81f3\u95dc\u91cd\u8981\u3002\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u9577\uff0c\u5982\u4f55\u512a\u5316\u6578\u64da\u5eab\u67e5\u8a62\u6210\u70ba\u4e86\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u9762\u81e8\u7684\u4e00\u5927\u6311\u6230\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u901a\u904e\u9023\u63a5\u5169\u500b\u5b57\u6bb5\u4f86\u512a\u5316\u6578\u64da\u5eab\u67e5\u8a62\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u6280\u5de7\u548c\u793a\u4f8b\u3002<\/p>\n<h2 id=\"%e7%90%86%e8%a7%a3%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9f%a5%e8%a9%a2%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-aryXtJjvmr\">\u7406\u89e3\u6578\u64da\u5eab\u67e5\u8a62\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u6578\u64da\u5eab\u67e5\u8a62\u662f\u7528\u4f86\u5f9e\u6578\u64da\u5eab\u4e2d\u6aa2\u7d22\u6578\u64da\u7684\u8acb\u6c42\u3002\u67e5\u8a62\u7684\u6548\u7387\u76f4\u63a5\u5f71\u97ff\u5230\u61c9\u7528\u7a0b\u5e8f\u7684\u97ff\u61c9\u6642\u9593\u548c\u7528\u6236\u9ad4\u9a57\u3002\u7576\u67e5\u8a62\u6d89\u53ca\u591a\u500b\u5b57\u6bb5\u6642\uff0c\u7279\u5225\u662f\u9700\u8981\u9023\u63a5\u5169\u500b\u6216\u591a\u500b\u5b57\u6bb5\u7684\u60c5\u6cc1\uff0c\u67e5\u8a62\u7684\u6027\u80fd\u53ef\u80fd\u6703\u53d7\u5230\u5f71\u97ff\u3002\u56e0\u6b64\uff0c\u4e86\u89e3\u5982\u4f55\u6709\u6548\u5730\u9023\u63a5\u5b57\u6bb5\u662f\u512a\u5316\u67e5\u8a62\u7684\u95dc\u9375\u3002<\/p>\n<h2 id=\"%e9%80%a3%e6%8e%a5%e5%85%a9%e5%80%8b%e5%ad%97%e6%ae%b5%e7%9a%84%e6%9f%a5%e8%a9%a2%e6%8a%80%e5%b7%a7-aryXtJjvmr\">\u9023\u63a5\u5169\u500b\u5b57\u6bb5\u7684\u67e5\u8a62\u6280\u5de7<\/h2>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8%e5%90%88%e9%81%a9%e7%9a%84%e7%b4%a2%e5%bc%95-aryXtJjvmr\">1. \u4f7f\u7528\u5408\u9069\u7684\u7d22\u5f15<\/h3>\n<p>\u5728\u6578\u64da\u5eab\u4e2d\uff0c\u7d22\u5f15\u662f\u4e00\u7a2e\u6578\u64da\u7d50\u69cb\uff0c\u53ef\u4ee5\u52a0\u901f\u67e5\u8a62\u64cd\u4f5c\u3002\u7576\u4f60\u9700\u8981\u9023\u63a5\u5169\u500b\u5b57\u6bb5\u6642\uff0c\u78ba\u4fdd\u9019\u4e9b\u5b57\u6bb5\u4e0a\u6709\u9069\u7576\u7684\u7d22\u5f15\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6709\u4e00\u500b\u7528\u6236\u8868\uff0c\u5305\u542b\u5b57\u6bb5 <code>first_name<\/code> \u548c <code>last_name<\/code>\uff0c\u5982\u679c\u7d93\u5e38\u9700\u8981\u6839\u64da\u9019\u5169\u500b\u5b57\u6bb5\u9032\u884c\u67e5\u8a62\uff0c\u5247\u53ef\u4ee5\u8003\u616e\u5275\u5efa\u4e00\u500b\u8907\u5408\u7d22\u5f15\uff1a<\/p>\n<pre><code>CREATE INDEX idx_name ON users (first_name, last_name);\n<\/code><\/pre>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8%e8%81%af%e6%8e%a5%ef%bc%88join%ef%bc%89%e6%93%8d%e4%bd%9c-aryXtJjvmr\">2. \u4f7f\u7528\u806f\u63a5\uff08JOIN\uff09\u64cd\u4f5c<\/h3>\n<p>\u5728 SQL \u4e2d\uff0c\u806f\u63a5\u64cd\u4f5c\u53ef\u4ee5\u7528\u4f86\u5f9e\u591a\u500b\u8868\u4e2d\u6aa2\u7d22\u6578\u64da\u3002\u7576\u9700\u8981\u6839\u64da\u5169\u500b\u5b57\u6bb5\u9032\u884c\u67e5\u8a62\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>INNER JOIN<\/code> \u6216 <code>LEFT JOIN<\/code> \u7b49\u64cd\u4f5c\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6709\u5169\u500b\u8868\uff1a<code>orders<\/code> \u548c <code>customers<\/code>\uff0c\u53ef\u4ee5\u6839\u64da\u5ba2\u6236\u7684\u540d\u5b57\u548c\u59d3\u6c0f\u4f86\u67e5\u8a62\u8a02\u55ae\uff1a<\/p>\n<pre><code>SELECT o.order_id, c.first_name, c.last_name\nFROM orders o\nINNER JOIN customers c ON o.customer_id = c.id\nWHERE c.first_name = 'John' AND c.last_name = 'Doe';\n<\/code><\/pre>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8%e6%a2%9d%e4%bb%b6%e9%81%8e%e6%bf%be-aryXtJjvmr\">3. \u4f7f\u7528\u689d\u4ef6\u904e\u6ffe<\/h3>\n<p>\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528\u689d\u4ef6\u904e\u6ffe\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u7576\u9023\u63a5\u5169\u500b\u5b57\u6bb5\u6642\uff0c\u61c9\u8a72\u5728 <code>WHERE<\/code> \u5b50\u53e5\u4e2d\u660e\u78ba\u6307\u5b9a\u689d\u4ef6\uff0c\u4ee5\u6e1b\u5c11\u8fd4\u56de\u7684\u6578\u64da\u91cf\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT * FROM users\nWHERE first_name = 'Alice' AND last_name = 'Smith';\n<\/code><\/pre>\n<p>\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u53ea\u6aa2\u7d22\u7b26\u5408\u689d\u4ef6\u7684\u8a18\u9304\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/p>\n<h3 id=\"4-%e9%81%bf%e5%85%8d%e4%bd%bf%e7%94%a8-select-aryXtJjvmr\">4. \u907f\u514d\u4f7f\u7528 SELECT *<\/h3>\n<p>\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528 <code>SELECT *<\/code> \u6703\u5c0e\u81f4\u6aa2\u7d22\u6240\u6709\u5b57\u6bb5\uff0c\u9019\u5728\u6578\u64da\u91cf\u5927\u6642\u6703\u5f71\u97ff\u6027\u80fd\u3002\u61c9\u8a72\u660e\u78ba\u6307\u5b9a\u9700\u8981\u7684\u5b57\u6bb5\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT first_name, last_name FROM users\nWHERE first_name = 'Alice' AND last_name = 'Smith';\n<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-aryXtJjvmr\">\u7e3d\u7d50<\/h2>\n<p>\u901a\u904e\u4ee5\u4e0a\u6280\u5de7\uff0c\u6211\u5011\u53ef\u4ee5\u6709\u6548\u5730\u512a\u5316\u6578\u64da\u5eab\u67e5\u8a62\uff0c\u7279\u5225\u662f\u5728\u9700\u8981\u9023\u63a5\u5169\u500b\u5b57\u6bb5\u7684\u60c5\u6cc1\u4e0b\u3002\u4f7f\u7528\u5408\u9069\u7684\u7d22\u5f15\u3001\u806f\u63a5\u64cd\u4f5c\u3001\u689d\u4ef6\u904e\u6ffe\u4ee5\u53ca\u907f\u514d\u4f7f\u7528 <code>SELECT *<\/code> \u90fd\u662f\u63d0\u5347\u67e5\u8a62\u6027\u80fd\u7684\u6709\u6548\u65b9\u6cd5\u3002\u96a8\u8457\u6578\u64da\u5eab\u6280\u8853\u7684\u767c\u5c55\uff0c\u6301\u7e8c\u5b78\u7fd2\u548c\u5be6\u8e10\u9019\u4e9b\u6280\u5de7\u5c07\u6709\u52a9\u65bc\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u66f4\u597d\u5730\u61c9\u5c0d\u65e5\u76ca\u589e\u9577\u7684\u6578\u64da\u6311\u6230\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u5eab\u61c9\u7528\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u5e6b\u52a9\u60a8\u5be6\u73fe\u6700\u4f73\u6027\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u5be6\u73fe\u6578\u64da\u5eab\u67e5\u8a62\u512a\u5316\u7684\u6280\u5de7\uff0c\u5b78\u7fd2\u5982\u4f55\u6709\u6548\u9023\u63a5\u5169\u500b\u5b57\u6bb5\u4ee5\u63d0\u5347\u67e5\u8a62\u6548\u7387\u548c\u6027\u80fd\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-183378","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/183378","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=183378"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/183378\/revisions"}],"predecessor-version":[{"id":183379,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/183378\/revisions\/183379"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=183378"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=183378"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=183378"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}