{"id":143875,"date":"2024-11-01T01:59:23","date_gmt":"2024-10-31T17:59:23","guid":{"rendered":"https:\/\/server.hk\/cnblog\/143875\/"},"modified":"2024-11-01T01:59:24","modified_gmt":"2024-10-31T17:59:24","slug":"sql-%e6%89%b9%e9%87%8f%e5%88%aa%e9%99%a4%e7%94%a8%e6%88%b6%e8%a1%a8%e7%9a%84%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/143875\/","title":{"rendered":"SQL \u6279\u91cf\u522a\u9664\u7528\u6236\u8868\u7684\u65b9\u6cd5"},"content":{"rendered":"

SQL \u6279\u91cf\u522a\u9664\u7528\u6236\u8868\u7684\u65b9\u6cd5<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u6279\u91cf\u522a\u9664\u7528\u6236\u8868\u4e2d\u7684\u6578\u64da\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f\u56e0\u70ba\u7528\u6236\u4e0d\u518d\u6d3b\u8e8d\uff0c\u9084\u662f\u56e0\u70ba\u9700\u8981\u6e05\u7406\u904e\u671f\u7684\u6578\u64da\uff0c\u638c\u63e1\u6709\u6548\u7684\u6279\u91cf\u522a\u9664\u65b9\u6cd5\u5c0d\u65bc\u7dad\u8b77\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u6574\u6f54\u81f3\u95dc\u91cd\u8981\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5e7e\u7a2e\u5728 SQL \u4e2d\u6279\u91cf\u522a\u9664\u7528\u6236\u8868\u6578\u64da\u7684\u65b9\u6cd5\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u793a\u4f8b\u548c\u6ce8\u610f\u4e8b\u9805\u3002<\/p>\n

1. \u4f7f\u7528 DELETE \u8a9e\u53e5<\/h2>\n

\u6700\u57fa\u672c\u7684\u6279\u91cf\u522a\u9664\u65b9\u6cd5\u662f\u4f7f\u7528 SQL \u7684 DELETE \u8a9e\u53e5\u3002\u9019\u7a2e\u65b9\u6cd5\u9069\u5408\u65bc\u522a\u9664\u7b26\u5408\u7279\u5b9a\u689d\u4ef6\u7684\u591a\u689d\u8a18\u9304\u3002<\/p>\n

DELETE FROM users WHERE last_login < '2022-01-01';<\/code><\/pre>\n
\u4e0a\u8ff0\u8a9e\u53e5\u5c07\u522a\u9664\u6240\u6709\u5728 2022 \u5e74 1 \u6708 1 \u65e5\u4e4b\u524d\u672a\u767b\u9304\u7684\u7528\u6236\u3002\u9019\u7a2e\u65b9\u6cd5\u7c21\u55ae\u660e\u4e86\uff0c\u4f46\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u554f\u984c\u3002<\/p>\n
2. \u4f7f\u7528 TRUNCATE \u8a9e\u53e5<\/h2>\n
\u5982\u679c\u9700\u8981\u522a\u9664\u6574\u500b\u7528\u6236\u8868\u4e2d\u7684\u6240\u6709\u6578\u64da\uff0c\u53ef\u4ee5\u4f7f\u7528 TRUNCATE \u8a9e\u53e5\u3002\u9019\u7a2e\u65b9\u6cd5\u6bd4 DELETE \u66f4\u5feb\uff0c\u56e0\u70ba\u5b83\u4e0d\u6703\u9010\u884c\u522a\u9664\uff0c\u800c\u662f\u76f4\u63a5\u91cb\u653e\u6574\u500b\u8868\u7684\u7a7a\u9593\u3002<\/p>\n
TRUNCATE TABLE users;<\/code><\/pre>\n
\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cTRUNCATE \u4e0d\u80fd\u7528\u65bc\u6709\u5916\u9375\u7d04\u675f\u7684\u8868\uff0c\u4e26\u4e14\u7121\u6cd5\u9032\u884c\u689d\u4ef6\u522a\u9664\u3002<\/p>\n
3. \u4f7f\u7528 WHERE \u5b50\u53e5\u9032\u884c\u689d\u4ef6\u522a\u9664<\/h2>\n
\u5728\u6279\u91cf\u522a\u9664\u6642\uff0c\u4f7f\u7528 WHERE \u5b50\u53e5\u53ef\u4ee5\u66f4\u7cbe\u78ba\u5730\u63a7\u5236\u522a\u9664\u7684\u7bc4\u570d\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u522a\u9664\u7279\u5b9a\u5e74\u9f61\u6bb5\u7684\u7528\u6236\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n
DELETE FROM users WHERE age > 60;<\/code><\/pre>\n
\u9019\u5c07\u522a\u9664\u6240\u6709\u5e74\u9f61\u5927\u65bc 60 \u6b72\u7684\u7528\u6236\u3002\u4f7f\u7528 WHERE \u5b50\u53e5\u53ef\u4ee5\u6709\u6548\u907f\u514d\u8aa4\u522a\u9664\u4e0d\u61c9\u8a72\u522a\u9664\u7684\u6578\u64da\u3002<\/p>\n
4. \u4f7f\u7528 JOIN \u8a9e\u53e5\u522a\u9664\u76f8\u95dc\u6578\u64da<\/h2>\n
\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u53ef\u80fd\u9700\u8981\u6839\u64da\u5176\u4ed6\u8868\u4e2d\u7684\u6578\u64da\u4f86\u522a\u9664\u7528\u6236\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u522a\u9664\u6240\u6709\u5728\u8a02\u55ae\u8868\u4e2d\u6c92\u6709\u4efb\u4f55\u8a02\u55ae\u7684\u7528\u6236\uff0c\u53ef\u4ee5\u4f7f\u7528 JOIN \u8a9e\u53e5\uff1a<\/p>\n
DELETE u FROM users u LEFT JOIN orders o ON u.id = o.user_id WHERE o.id IS NULL;<\/code><\/pre>\n
\u9019\u689d\u8a9e\u53e5\u5c07\u522a\u9664\u6240\u6709\u5728\u8a02\u55ae\u8868\u4e2d\u6c92\u6709\u5c0d\u61c9\u8a18\u9304\u7684\u7528\u6236\u3002\u9019\u7a2e\u65b9\u6cd5\u975e\u5e38\u9748\u6d3b\uff0c\u9069\u5408\u65bc\u8907\u96dc\u7684\u6578\u64da\u95dc\u806f\u60c5\u6cc1\u3002<\/p>\n
5. \u4f7f\u7528\u4e8b\u52d9\u4fdd\u8b77\u6578\u64da\u5b8c\u6574\u6027<\/h2>\n
\u5728\u9032\u884c\u6279\u91cf\u522a\u9664\u64cd\u4f5c\u6642\uff0c\u5efa\u8b70\u4f7f\u7528\u4e8b\u52d9\u4f86\u4fdd\u8b77\u6578\u64da\u7684\u5b8c\u6574\u6027\u3002\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u5728\u522a\u9664\u904e\u7a0b\u4e2d\u51fa\u73fe\u932f\u8aa4\u6642\uff0c\u53ef\u4ee5\u56de\u6efe\u5230\u4e4b\u524d\u7684\u72c0\u614b\u3002<\/p>\n
START TRANSACTION;\nDELETE FROM users WHERE last_login < '2022-01-01';\nCOMMIT;<\/code><\/pre>\n
\u9019\u6a23\uff0c\u5982\u679c\u5728\u522a\u9664\u904e\u7a0b\u4e2d\u51fa\u73fe\u554f\u984c\uff0c\u53ef\u4ee5\u4f7f\u7528 ROLLBACK \u4f86\u64a4\u92b7\u64cd\u4f5c\uff0c\u5f9e\u800c\u4fdd\u8b77\u6578\u64da\u7684\u5b89\u5168\u6027\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u6279\u91cf\u522a\u9664\u7528\u6236\u8868\u4e2d\u7684\u6578\u64da\u662f\u4e00\u9805\u91cd\u8981\u7684\u6578\u64da\u5eab\u7ba1\u7406\u4efb\u52d9\u3002\u901a\u904e\u4f7f\u7528 DELETE\u3001TRUNCATE\u3001WHERE \u5b50\u53e5\u3001JOIN \u8a9e\u53e5\u4ee5\u53ca\u4e8b\u52d9\u7b49\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406\u548c\u6e05\u7406\u6578\u64da\u3002\u9078\u64c7\u5408\u9069\u7684\u65b9\u6cd5\u4e0d\u50c5\u80fd\u63d0\u9ad8\u64cd\u4f5c\u6548\u7387\uff0c\u9084\u80fd\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u5b89\u5168\u6027\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u7528\u6236\uff0c\u9078\u64c7\u5408\u9069\u7684 VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u5c07\u6709\u52a9\u65bc\u63d0\u5347\u6574\u9ad4\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3\u5982\u4f55\u4f7f\u7528 SQL \u6279\u91cf\u522a\u9664\u7528\u6236\u8868\u4e2d\u7684\u6578\u64da\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\uff0c\u7c21\u5316\u6578\u64da\u6e05\u7406\u904e\u7a0b\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-143875","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143875","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=143875"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143875\/revisions"}],"predecessor-version":[{"id":143876,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143875\/revisions\/143876"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=143875"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=143875"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=143875"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}