{"id":172527,"date":"2024-11-07T13:52:23","date_gmt":"2024-11-07T05:52:23","guid":{"rendered":"https:\/\/server.hk\/cnblog\/172527\/"},"modified":"2024-11-07T13:52:24","modified_gmt":"2024-11-07T05:52:24","slug":"%e5%a6%82%e4%bd%95%e9%81%bf%e5%85%8d%e5%af%ab%e5%87%ba%e6%85%a2sql","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/172527\/","title":{"rendered":"\u5982\u4f55\u907f\u514d\u5beb\u51fa\u201c\u6162SQL\u201d"},"content":{"rendered":"

\u5982\u4f55\u907f\u514d\u5beb\u51fa\u201c\u6162SQL\u201d<\/h1>\n

\u5728\u73fe\u4eca\u7684\u6578\u64da\u9a45\u52d5\u6642\u4ee3\uff0cSQL\u67e5\u8a62\u7684\u6027\u80fd\u5c0d\u65bc\u61c9\u7528\u7a0b\u5e8f\u7684\u6574\u9ad4\u6548\u80fd\u81f3\u95dc\u91cd\u8981\u3002\u6162SQL\u67e5\u8a62\u4e0d\u50c5\u6703\u5f71\u97ff\u7528\u6236\u9ad4\u9a57\uff0c\u9084\u53ef\u80fd\u5c0e\u81f4\u7cfb\u7d71\u8cc7\u6e90\u7684\u6d6a\u8cbb\u3002\u56e0\u6b64\uff0c\u4e86\u89e3\u5982\u4f55\u907f\u514d\u5beb\u51fa\u6162SQL\u67e5\u8a62\u662f\u6bcf\u4f4d\u958b\u767c\u8005\u5fc5\u9808\u638c\u63e1\u7684\u6280\u80fd\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u4e00\u4e9b\u5e38\u898b\u7684\u6700\u4f73\u5be6\u8e10\uff0c\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u512a\u5316SQL\u67e5\u8a62\u6027\u80fd\u3002<\/p>\n

1. \u4f7f\u7528\u7d22\u5f15<\/h2>\n

\u7d22\u5f15\u662f\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u7684\u95dc\u9375\u3002\u901a\u904e\u5728\u8868\u7684\u5217\u4e0a\u5275\u5efa\u7d22\u5f15\uff0c\u53ef\u4ee5\u986f\u8457\u6e1b\u5c11\u67e5\u8a62\u6240\u9700\u7684\u6642\u9593\u3002\u7576\u6578\u64da\u91cf\u589e\u5927\u6642\uff0c\u7d22\u5f15\u7684\u4f5c\u7528\u5c24\u70ba\u660e\u986f\u3002\u4ee5\u4e0b\u662f\u5275\u5efa\u7d22\u5f15\u7684\u57fa\u672c\u8a9e\u6cd5\uff1a<\/p>\n

CREATE INDEX index_name ON table_name (column1, column2, ...);<\/code><\/pre>\n
\u7136\u800c\uff0c\u904e\u591a\u7684\u7d22\u5f15\u4e5f\u6703\u5f71\u97ff\u5beb\u5165\u6027\u80fd\uff0c\u56e0\u6b64\u61c9\u6839\u64da\u5be6\u969b\u9700\u6c42\u8b39\u614e\u9078\u64c7\u3002<\/p>\n
2. \u907f\u514d\u4f7f\u7528SELECT *<\/h2>\n
\u4f7f\u7528\u201cSELECT *\u201d\u6703\u5c0e\u81f4\u67e5\u8a62\u8fd4\u56de\u6240\u6709\u5217\uff0c\u9019\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u53ef\u80fd\u6703\u5c0e\u81f4\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u50b3\u8f38\u3002\u76f8\u53cd\uff0c\u61c9\u8a72\u660e\u78ba\u6307\u5b9a\u6240\u9700\u7684\u5217\uff0c\u4ee5\u6e1b\u5c11\u6578\u64da\u91cf\u3002\u4f8b\u5982\uff1a<\/p>\n
SELECT column1, column2 FROM table_name WHERE condition;<\/code><\/pre>\n
3. \u4f7f\u7528JOIN\u800c\u975e\u5b50\u67e5\u8a62<\/h2>\n
\u5728\u8a31\u591a\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528JOIN\u64cd\u4f5c\u6bd4\u4f7f\u7528\u5b50\u67e5\u8a62\u66f4\u6709\u6548\u7387\u3002\u5b50\u67e5\u8a62\u53ef\u80fd\u6703\u5c0e\u81f4\u591a\u6b21\u67e5\u8a62\uff0c\u800cJOIN\u5247\u53ef\u4ee5\u5728\u4e00\u6b21\u67e5\u8a62\u4e2d\u7372\u53d6\u6240\u9700\u7684\u6578\u64da\u3002\u4ee5\u4e0b\u662fJOIN\u7684\u57fa\u672c\u7528\u6cd5\uff1a<\/p>\n
SELECT a.column1, b.column2 \nFROM table_a a \nJOIN table_b b ON a.id = b.a_id;<\/code><\/pre>\n
4. \u9069\u7576\u4f7f\u7528WHERE\u689d\u4ef6<\/h2>\n
\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528WHERE\u689d\u4ef6\u53ef\u4ee5\u986f\u8457\u6e1b\u5c11\u8fd4\u56de\u7684\u6578\u64da\u91cf\u3002\u78ba\u4fdd\u5728WHERE\u5b50\u53e5\u4e2d\u4f7f\u7528\u9069\u7576\u7684\u689d\u4ef6\uff0c\u4ee5\u904e\u6ffe\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u3002\u4f8b\u5982\uff1a<\/p>\n
SELECT column1 FROM table_name WHERE column2 = 'value';<\/code><\/pre>\n
5. \u907f\u514d\u4e0d\u5fc5\u8981\u7684\u8a08\u7b97<\/h2>\n
\u5728SQL\u67e5\u8a62\u4e2d\u9032\u884c\u8a08\u7b97\u6703\u589e\u52a0\u67e5\u8a62\u7684\u8907\u96dc\u6027\uff0c\u4e26\u53ef\u80fd\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\u3002\u61c9\u76e1\u91cf\u907f\u514d\u5728\u67e5\u8a62\u4e2d\u9032\u884c\u8a08\u7b97\uff0c\u5c24\u5176\u662f\u5728WHERE\u5b50\u53e5\u4e2d\u3002\u53ef\u4ee5\u8003\u616e\u5728\u61c9\u7528\u5c64\u9032\u884c\u8a08\u7b97\uff0c\u6216\u4f7f\u7528\u9810\u8a08\u7b97\u7684\u5b57\u6bb5\u3002<\/p>\n
6. \u4f7f\u7528LIMIT\u9650\u5236\u7d50\u679c\u96c6<\/h2>\n
\u5728\u9700\u8981\u8fd4\u56de\u5927\u91cf\u6578\u64da\u7684\u67e5\u8a62\u4e2d\uff0c\u4f7f\u7528LIMIT\u53ef\u4ee5\u9650\u5236\u8fd4\u56de\u7684\u884c\u6578\uff0c\u5f9e\u800c\u63d0\u9ad8\u6027\u80fd\u3002\u4f8b\u5982\uff1a<\/p>\n
SELECT column1 FROM table_name LIMIT 10;<\/code><\/pre>\n
7. \u5b9a\u671f\u6aa2\u67e5\u548c\u512a\u5316\u67e5\u8a62<\/h2>\n
\u5b9a\u671f\u6aa2\u67e5\u548c\u512a\u5316SQL\u67e5\u8a62\u662f\u4fdd\u6301\u7cfb\u7d71\u6027\u80fd\u7684\u5fc5\u8981\u6b65\u9a5f\u3002\u53ef\u4ee5\u4f7f\u7528\u6578\u64da\u5eab\u63d0\u4f9b\u7684\u6027\u80fd\u5206\u6790\u5de5\u5177\u4f86\u8b58\u5225\u6162\u67e5\u8a62\uff0c\u4e26\u6839\u64da\u5206\u6790\u7d50\u679c\u9032\u884c\u512a\u5316\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u907f\u514d\u5beb\u51fa\u6162SQL\u67e5\u8a62\u9700\u8981\u958b\u767c\u8005\u5728\u8a2d\u8a08\u548c\u7de8\u5beb\u67e5\u8a62\u6642\u4fdd\u6301\u8b39\u614e\u3002\u901a\u904e\u4f7f\u7528\u7d22\u5f15\u3001\u907f\u514d\u4f7f\u7528SELECT *\u3001\u9069\u7576\u4f7f\u7528JOIN\u3001\u4f7f\u7528WHERE\u689d\u4ef6\u3001\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u8a08\u7b97\u3001\u4f7f\u7528LIMIT\u4ee5\u53ca\u5b9a\u671f\u6aa2\u67e5\u548c\u512a\u5316\u67e5\u8a62\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8SQL\u67e5\u8a62\u7684\u6027\u80fd\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684\u9999\u6e2fVPS<\/a>\u6216\u96f2\u4f3a\u670d\u5668<\/a>\u89e3\u6c7a\u65b9\u6848\u4e5f\u662f\u81f3\u95dc\u91cd\u8981\u7684\uff0c\u9019\u5c07\u6709\u52a9\u65bc\u78ba\u4fdd\u7cfb\u7d71\u7684\u7a69\u5b9a\u6027\u548c\u9ad8\u6548\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5b78\u7fd2\u5982\u4f55\u907f\u514d\u5beb\u51fa\u201c\u6162SQL\u201d\uff0c\u63d0\u5347\u67e5\u8a62\u6548\u7387\uff0c\u512a\u5316\u6578\u64da\u5eab\u6027\u80fd\uff0c\u78ba\u4fdd\u61c9\u7528\u7a0b\u5f0f\u5feb\u901f\u97ff\u61c9\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-172527","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172527","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=172527"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172527\/revisions"}],"predecessor-version":[{"id":172528,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172527\/revisions\/172528"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=172527"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=172527"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=172527"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}