{"id":189004,"date":"2024-11-12T03:43:25","date_gmt":"2024-11-11T19:43:25","guid":{"rendered":"https:\/\/server.hk\/cnblog\/189004\/"},"modified":"2024-11-12T03:43:27","modified_gmt":"2024-11-11T19:43:27","slug":"%e6%8f%90%e9%ab%98%e5%88%86%e5%b1%a4-sql-%e7%b5%90%e6%a7%8b%e7%9a%84%e6%80%a7%e8%83%bd","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/189004\/","title":{"rendered":"\u63d0\u9ad8\u5206\u5c64 SQL \u7d50\u69cb\u7684\u6027\u80fd"},"content":{"rendered":"

\u63d0\u9ad8\u5206\u5c64 SQL \u7d50\u69cb\u7684\u6027\u80fd<\/h1>\n

\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\u7279\u5225\u662f\u5728\u4f7f\u7528\u5206\u5c64 SQL \u7d50\u69cb\u6642\uff0c\u5982\u4f55\u63d0\u9ad8\u5176\u6027\u80fd\u6210\u70ba\u4e86\u8a31\u591a\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u9762\u81e8\u7684\u6311\u6230\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u4e00\u4e9b\u6709\u6548\u7684\u65b9\u6cd5\u4f86\u512a\u5316\u5206\u5c64 SQL \u7d50\u69cb\u7684\u6027\u80fd\u3002<\/p>\n

\u7406\u89e3\u5206\u5c64 SQL \u7d50\u69cb<\/h2>\n

\u5206\u5c64 SQL \u7d50\u69cb\u901a\u5e38\u6307\u7684\u662f\u5728\u6578\u64da\u5eab\u4e2d\u4f7f\u7528\u591a\u5c64\u6b21\u7684\u67e5\u8a62\u4f86\u7372\u53d6\u6578\u64da\u3002\u9019\u7a2e\u7d50\u69cb\u53ef\u4ee5\u5e6b\u52a9\u7d44\u7e54\u8907\u96dc\u7684\u6578\u64da\u95dc\u4fc2\uff0c\u4f46\u5982\u679c\u4e0d\u52a0\u4ee5\u512a\u5316\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u74f6\u9838\u3002\u5206\u5c64 SQL \u7d50\u69cb\u7684\u6027\u80fd\u554f\u984c\u901a\u5e38\u6e90\u65bc\u4e0d\u5fc5\u8981\u7684\u5d4c\u5957\u67e5\u8a62\u3001\u7f3a\u4e4f\u7d22\u5f15\u6216\u4e0d\u7576\u7684\u6578\u64da\u6a21\u578b\u8a2d\u8a08\u3002<\/p>\n

\u512a\u5316\u5206\u5c64 SQL \u67e5\u8a62\u7684\u7b56\u7565<\/h2>\n

1. \u4f7f\u7528\u7d22\u5f15<\/h3>\n

\u7d22\u5f15\u662f\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u7684\u95dc\u9375\u3002\u901a\u904e\u5728\u7d93\u5e38\u67e5\u8a62\u7684\u5217\u4e0a\u5275\u5efa\u7d22\u5f15\uff0c\u53ef\u4ee5\u986f\u8457\u6e1b\u5c11\u67e5\u8a62\u7684\u57f7\u884c\u6642\u9593\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff1a<\/p>\n

CREATE INDEX idx_user_name ON users(name);<\/code><\/pre>\n
\u9019\u6a23\uff0c\u7576\u67e5\u8a62\u7528\u6236\u540d\u6642\uff0c\u6578\u64da\u5eab\u53ef\u4ee5\u66f4\u5feb\u5730\u5b9a\u4f4d\u5230\u76f8\u95dc\u6578\u64da\u3002<\/p>\n
2. \u6e1b\u5c11\u5d4c\u5957\u67e5\u8a62<\/h3>\n
\u5d4c\u5957\u67e5\u8a62\u96d6\u7136\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u662f\u5fc5\u8981\u7684\uff0c\u4f46\u904e\u591a\u7684\u5d4c\u5957\u6703\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\u3002\u53ef\u4ee5\u8003\u616e\u4f7f\u7528\u806f\u63a5\uff08JOIN\uff09\u4f86\u66ff\u4ee3\u5d4c\u5957\u67e5\u8a62\u3002\u4f8b\u5982\uff0c\u5c07\u4ee5\u4e0b\u5d4c\u5957\u67e5\u8a62\uff1a<\/p>\n
SELECT * FROM orders WHERE user_id IN (SELECT id FROM users WHERE active = 1);<\/code><\/pre>\n
\u6539\u5beb\u70ba\uff1a<\/p>\n
SELECT o.* FROM orders o JOIN users u ON o.user_id = u.id WHERE u.active = 1;<\/code><\/pre>\n
3. \u4f7f\u7528\u9069\u7576\u7684\u6578\u64da\u985e\u578b<\/h3>\n
\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u4e0d\u50c5\u53ef\u4ee5\u7bc0\u7701\u5b58\u5132\u7a7a\u9593\uff0c\u9084\u80fd\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u4f8b\u5982\uff0c\u5c0d\u65bc\u5e03\u723e\u503c\uff0c\u4f7f\u7528 TINYINT \u800c\u4e0d\u662f INT \u53ef\u4ee5\u6e1b\u5c11\u6578\u64da\u5eab\u7684\u8ca0\u64d4\u3002<\/p>\n
4. \u5b9a\u671f\u9032\u884c\u6578\u64da\u5eab\u7dad\u8b77<\/h3>\n
\u5b9a\u671f\u7684\u6578\u64da\u5eab\u7dad\u8b77\uff0c\u5982\u91cd\u5efa\u7d22\u5f15\u548c\u66f4\u65b0\u7d71\u8a08\u4fe1\u606f\uff0c\u53ef\u4ee5\u5e6b\u52a9\u4fdd\u6301\u6578\u64da\u5eab\u7684\u6027\u80fd\u3002\u9019\u4e9b\u64cd\u4f5c\u53ef\u4ee5\u6e05\u7406\u788e\u7247\uff0c\u4e26\u78ba\u4fdd\u67e5\u8a62\u8a08\u5283\u7684\u6700\u4f73\u5316\u3002<\/p>\n
5. \u4f7f\u7528\u67e5\u8a62\u7de9\u5b58<\/h3>\n
\u67e5\u8a62\u7de9\u5b58\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u91cd\u8907\u67e5\u8a62\u7684\u6027\u80fd\u3002\u901a\u904e\u7de9\u5b58\u67e5\u8a62\u7d50\u679c\uff0c\u6578\u64da\u5eab\u53ef\u4ee5\u907f\u514d\u91cd\u8907\u8a08\u7b97\uff0c\u5f9e\u800c\u63d0\u9ad8\u97ff\u61c9\u901f\u5ea6\u3002<\/p>\n
\u76e3\u63a7\u548c\u5206\u6790\u6027\u80fd<\/h2>\n
\u70ba\u4e86\u6301\u7e8c\u63d0\u9ad8\u5206\u5c64 SQL \u7d50\u69cb\u7684\u6027\u80fd\uff0c\u76e3\u63a7\u548c\u5206\u6790\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\u3002\u4f7f\u7528\u6578\u64da\u5eab\u6027\u80fd\u76e3\u63a7\u5de5\u5177\uff0c\u53ef\u4ee5\u53ca\u6642\u767c\u73fe\u6027\u80fd\u74f6\u9838\uff0c\u4e26\u9032\u884c\u76f8\u61c9\u7684\u8abf\u6574\u3002\u9019\u4e9b\u5de5\u5177\u901a\u5e38\u63d0\u4f9b\u67e5\u8a62\u57f7\u884c\u8a08\u5283\u3001\u8cc7\u6e90\u4f7f\u7528\u60c5\u6cc1\u7b49\u4fe1\u606f\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u505a\u51fa\u660e\u667a\u7684\u6c7a\u7b56\u3002<\/p>\n
\u7d50\u8ad6<\/h2>\n
\u63d0\u9ad8\u5206\u5c64 SQL \u7d50\u69cb\u7684\u6027\u80fd\u9700\u8981\u591a\u65b9\u9762\u7684\u52aa\u529b\uff0c\u5305\u62ec\u4f7f\u7528\u7d22\u5f15\u3001\u6e1b\u5c11\u5d4c\u5957\u67e5\u8a62\u3001\u9078\u64c7\u9069\u7576\u7684\u6578\u64da\u985e\u578b\u3001\u5b9a\u671f\u7dad\u8b77\u4ee5\u53ca\u4f7f\u7528\u67e5\u8a62\u7de9\u5b58\u3002\u901a\u904e\u9019\u4e9b\u7b56\u7565\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u986f\u8457\u63d0\u5347\u6578\u64da\u5eab\u7684\u6027\u80fd\uff0c\u5f9e\u800c\u63d0\u9ad8\u61c9\u7528\u7a0b\u5e8f\u7684\u6574\u9ad4\u6548\u7387\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6027\u80fd\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u7684\u7528\u6236\uff0c\u9078\u64c7\u5408\u9069\u7684 VPS<\/a> \u6216 \u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u4e5f\u662f\u4e00\u500b\u91cd\u8981\u7684\u8003\u91cf\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22\u63d0\u9ad8\u5206\u5c64 SQL \u7d50\u69cb\u6027\u80fd\u7684\u6709\u6548\u7b56\u7565\uff0c\u512a\u5316\u67e5\u8a62\u6548\u7387\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u901f\u5ea6\uff0c\u5be6\u73fe\u66f4\u6d41\u66a2\u7684\u6578\u64da\u7ba1\u7406\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-189004","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/189004","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=189004"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/189004\/revisions"}],"predecessor-version":[{"id":189005,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/189004\/revisions\/189005"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=189004"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=189004"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=189004"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}