{"id":183926,"date":"2024-11-10T08:53:15","date_gmt":"2024-11-10T00:53:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/183926\/"},"modified":"2024-11-10T08:53:16","modified_gmt":"2024-11-10T00:53:16","slug":"%e4%bd%bf%e7%94%a8pg%e6%95%b8%e6%93%9a%e5%ba%ab%e5%af%a6%e7%8f%be%e9%ab%98%e6%95%88%e7%9a%84delete%e6%93%8d%e4%bd%9c-pg%e6%95%b8%e6%93%9a%e5%ba%ab-delete-from","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/183926\/","title":{"rendered":"\u4f7f\u7528PG\u6578\u64da\u5eab\u5be6\u73fe\u9ad8\u6548\u7684Delete\u64cd\u4f5c (pg\u6578\u64da\u5eab delete from)"},"content":{"rendered":"

\u4f7f\u7528PG\u6578\u64da\u5eab\u5be6\u73fe\u9ad8\u6548\u7684Delete\u64cd\u4f5c (pg\u6578\u64da\u5eab delete from)<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u522a\u9664\u64cd\u4f5c\u662f\u5e38\u898b\u4e14\u5fc5\u8981\u7684\u4efb\u52d9\u4e4b\u4e00\u3002\u5c0d\u65bc\u4f7f\u7528PostgreSQL\uff08PG\uff09\u6578\u64da\u5eab\u7684\u958b\u767c\u8005\u4f86\u8aaa\uff0c\u5982\u4f55\u9ad8\u6548\u5730\u57f7\u884c\u522a\u9664\u64cd\u4f5c\uff08DELETE\uff09\u662f\u63d0\u5347\u7cfb\u7d71\u6027\u80fd\u7684\u95dc\u9375\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5728PG\u6578\u64da\u5eab\u4e2d\u5be6\u73fe\u9ad8\u6548\u522a\u9664\u64cd\u4f5c\u7684\u5e7e\u7a2e\u65b9\u6cd5\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u548c\u6700\u4f73\u5be6\u8e10\u3002<\/p>\n

1. \u57fa\u672c\u7684DELETE\u8a9e\u53e5<\/h2>\n

\u5728PG\u6578\u64da\u5eab\u4e2d\uff0c\u6700\u57fa\u672c\u7684\u522a\u9664\u64cd\u4f5c\u662f\u4f7f\u7528DELETE\u8a9e\u53e5\u3002\u5176\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n

DELETE FROM \u8868\u540d WHERE \u689d\u4ef6;<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u82e5\u8981\u5f9e\u540d\u70ba\u201cusers\u201d\u7684\u8868\u4e2d\u522a\u9664\u6240\u6709\u5e74\u9f61\u5927\u65bc30\u7684\u7528\u6236\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n
DELETE FROM users WHERE age > 30;<\/code><\/pre>\n
2. \u4f7f\u7528LIMIT\u9650\u5236\u522a\u9664\u6578\u91cf<\/h2>\n
\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u522a\u9664\u5927\u91cf\u6578\u64da\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\u3002\u70ba\u4e86\u907f\u514d\u9019\u7a2e\u60c5\u6cc1\uff0c\u53ef\u4ee5\u4f7f\u7528LIMIT\u5b50\u53e5\u4f86\u9650\u5236\u6bcf\u6b21\u522a\u9664\u7684\u884c\u6578\u3002\u4f8b\u5982\uff1a<\/p>\n
DELETE FROM users WHERE age > 30 LIMIT 100;<\/code><\/pre>\n
\u9019\u6a23\u53ef\u4ee5\u5206\u6279\u522a\u9664\u6578\u64da\uff0c\u6e1b\u5c11\u5c0d\u7cfb\u7d71\u6027\u80fd\u7684\u5f71\u97ff\u3002<\/p>\n
3. \u4f7f\u7528\u4e8b\u52d9\u7ba1\u7406\u522a\u9664\u64cd\u4f5c<\/h2>\n
\u5728\u57f7\u884c\u522a\u9664\u64cd\u4f5c\u6642\uff0c\u4f7f\u7528\u4e8b\u52d9\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u3002\u53ef\u4ee5\u4f7f\u7528BEGIN\u548cCOMMIT\u4f86\u7ba1\u7406\u4e8b\u52d9\u3002\u4f8b\u5982\uff1a<\/p>\n
BEGIN;\nDELETE FROM users WHERE age > 30;\nCOMMIT;<\/code><\/pre>\n
\u5982\u679c\u5728\u522a\u9664\u904e\u7a0b\u4e2d\u767c\u751f\u932f\u8aa4\uff0c\u53ef\u4ee5\u4f7f\u7528ROLLBACK\u4f86\u64a4\u92b7\u64cd\u4f5c\uff0c\u78ba\u4fdd\u6578\u64da\u4e0d\u6703\u8655\u65bc\u4e0d\u4e00\u81f4\u7684\u72c0\u614b\u3002<\/p>\n
4. \u8003\u616e\u4f7f\u7528\u7d22\u5f15<\/h2>\n
\u5728\u522a\u9664\u64cd\u4f5c\u4e2d\uff0c\u7d22\u5f15\u7684\u4f7f\u7528\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u7576\u522a\u9664\u7684\u689d\u4ef6\u6d89\u53ca\u7d22\u5f15\u5217\u6642\uff0cPG\u6578\u64da\u5eab\u53ef\u4ee5\u66f4\u5feb\u5730\u5b9a\u4f4d\u5230\u9700\u8981\u522a\u9664\u7684\u884c\u3002\u4f8b\u5982\uff0c\u5982\u679c\u201cage\u201d\u5217\u4e0a\u6709\u7d22\u5f15\uff0c\u5247\u4e0a\u8ff0\u522a\u9664\u64cd\u4f5c\u7684\u6027\u80fd\u6703\u66f4\u597d\u3002<\/p>\n
5. \u4f7f\u7528VACUUM\u6e05\u7406\u7a7a\u9593<\/h2>\n
\u5728\u57f7\u884c\u5927\u91cf\u522a\u9664\u64cd\u4f5c\u5f8c\uff0cPG\u6578\u64da\u5eab\u4e2d\u7684\u7a7a\u9593\u53ef\u80fd\u6703\u8b8a\u5f97\u788e\u7247\u5316\u3002\u4f7f\u7528VACUUM\u547d\u4ee4\u53ef\u4ee5\u6e05\u7406\u9019\u4e9b\u7a7a\u9593\uff0c\u4e26\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u6027\u80fd\u3002\u53ef\u4ee5\u5b9a\u671f\u904b\u884c\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n
VACUUM;<\/code><\/pre>\n
\u9019\u6a23\u53ef\u4ee5\u91cb\u653e\u88ab\u522a\u9664\u884c\u4f54\u7528\u7684\u7a7a\u9593\uff0c\u4e26\u4fdd\u6301\u6578\u64da\u5eab\u7684\u5065\u5eb7\u72c0\u614b\u3002<\/p>\n
6. \u4f7f\u7528PARTITIONING\u9032\u884c\u6578\u64da\u7ba1\u7406<\/h2>\n
\u5c0d\u65bc\u5927\u578b\u6578\u64da\u96c6\uff0c\u8003\u616e\u4f7f\u7528\u8868\u5206\u5340\uff08Partitioning\uff09\u4f86\u7ba1\u7406\u6578\u64da\u3002\u901a\u904e\u5c07\u6578\u64da\u5206\u6210\u591a\u500b\u5c0f\u8868\uff0c\u53ef\u4ee5\u66f4\u9ad8\u6548\u5730\u57f7\u884c\u522a\u9664\u64cd\u4f5c\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u6839\u64da\u65e5\u671f\u5c07\u6578\u64da\u5206\u5340\uff0c\u7136\u5f8c\u91dd\u5c0d\u7279\u5b9a\u5206\u5340\u9032\u884c\u522a\u9664\uff1a<\/p>\n
DELETE FROM users_partitioned WHERE created_at < '2022-01-01';<\/code><\/pre>\n
\u9019\u6a23\u53ef\u4ee5\u907f\u514d\u5168\u8868\u6383\u63cf\uff0c\u63d0\u9ad8\u522a\u9664\u64cd\u4f5c\u7684\u6548\u7387\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u5728PostgreSQL\u6578\u64da\u5eab\u4e2d\uff0c\u5be6\u73fe\u9ad8\u6548\u7684\u522a\u9664\u64cd\u4f5c\u9700\u8981\u8003\u616e\u591a\u7a2e\u56e0\u7d20\uff0c\u5305\u62ec\u4f7f\u7528\u9069\u7576\u7684\u8a9e\u6cd5\u3001\u9650\u5236\u522a\u9664\u6578\u91cf\u3001\u7ba1\u7406\u4e8b\u52d9\u3001\u5229\u7528\u7d22\u5f15\u3001\u5b9a\u671f\u6e05\u7406\u7a7a\u9593\u4ee5\u53ca\u8003\u616e\u6578\u64da\u5206\u5340\u7b49\u3002\u9019\u4e9b\u65b9\u6cd5\u4e0d\u50c5\u80fd\u63d0\u9ad8\u522a\u9664\u64cd\u4f5c\u7684\u6027\u80fd\uff0c\u9084\u80fd\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528\u9999\u6e2fVPS<\/a>\u4f86\u90e8\u7f72\u60a8\u7684PG\u6578\u64da\u5eab\uff0c\u4eab\u53d7\u66f4\u5feb\u7684\u6578\u64da\u8655\u7406\u901f\u5ea6\u548c\u66f4\u9ad8\u7684\u7cfb\u7d71\u7a69\u5b9a\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22\u5982\u4f55\u5728PG\u6578\u64da\u5eab\u4e2d\u9ad8\u6548\u57f7\u884cDelete\u64cd\u4f5c\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\uff0c\u512a\u5316\u6027\u80fd\uff0c\u78ba\u4fdd\u6578\u64da\u5b8c\u6574\u6027\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-183926","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/183926","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=183926"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/183926\/revisions"}],"predecessor-version":[{"id":183927,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/183926\/revisions\/183927"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=183926"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=183926"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=183926"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}