{"id":171365,"date":"2024-11-07T02:08:18","date_gmt":"2024-11-06T18:08:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/171365\/"},"modified":"2024-11-07T02:08:18","modified_gmt":"2024-11-06T18:08:18","slug":"%e6%b7%ba%e8%ab%87sql%e6%80%a7%e8%83%bd%e5%84%aa%e5%8c%96%e7%9a%84%e5%8d%81%e6%a2%9d%e6%8e%aa%e6%96%bd","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/171365\/","title":{"rendered":"\u6dfa\u8ac7SQL\u6027\u80fd\u512a\u5316\u7684\u5341\u689d\u63aa\u65bd"},"content":{"rendered":"

\u6dfa\u8ac7SQL\u6027\u80fd\u512a\u5316\u7684\u5341\u689d\u63aa\u65bd<\/h1>\n

\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0cSQL\u6027\u80fd\u512a\u5316\u5c0d\u65bc\u78ba\u4fdd\u6578\u64da\u5eab\u7684\u9ad8\u6548\u904b\u884c\u81f3\u95dc\u91cd\u8981\u3002\u7121\u8ad6\u662f\u5927\u578b\u4f01\u696d\u9084\u662f\u4e2d\u5c0f\u578b\u516c\u53f8\uff0c\u512a\u5316SQL\u67e5\u8a62\u4e0d\u50c5\u80fd\u63d0\u9ad8\u61c9\u7528\u7a0b\u5e8f\u7684\u97ff\u61c9\u901f\u5ea6\uff0c\u9084\u80fd\u964d\u4f4e\u8cc7\u6e90\u6d88\u8017\u3002\u4ee5\u4e0b\u662f\u5341\u689d\u6709\u6548\u7684SQL\u6027\u80fd\u512a\u5316\u63aa\u65bd\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u63d0\u5347\u6578\u64da\u5eab\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\u52a0\u5feb\u67e5\u8a62\u901f\u5ea6\u3002\u7279\u5225\u662f\u5728\u9032\u884c\u7be9\u9078\u3001\u6392\u5e8f\u6216\u9023\u63a5\u64cd\u4f5c\u6642\uff0c\u7d22\u5f15\u80fd\u5920\u6e1b\u5c11\u6578\u64da\u6383\u63cf\u7684\u7bc4\u570d\u3002<\/p>\n

CREATE INDEX idx_column_name ON table_name(column_name);<\/code><\/pre>\n
2. \u907f\u514dSELECT *<\/h2>\n
\u4f7f\u7528SELECT *\u6703\u5c0e\u81f4\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u50b3\u8f38\uff0c\u589e\u52a0\u67e5\u8a62\u7684\u8ca0\u64d4\u3002\u61c9\u8a72\u660e\u78ba\u6307\u5b9a\u6240\u9700\u7684\u5217\uff0c\u4ee5\u6e1b\u5c11\u6578\u64da\u91cf\u3002<\/p>\n
SELECT column1, column2 FROM table_name;<\/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\u9ad8\u6548\u3002JOIN\u53ef\u4ee5\u5728\u55ae\u4e00\u67e5\u8a62\u4e2d\u7372\u53d6\u6240\u9700\u7684\u6578\u64da\uff0c\u6e1b\u5c11\u67e5\u8a62\u7684\u8907\u96dc\u6027\u548c\u57f7\u884c\u6642\u9593\u3002<\/p>\n
SELECT a.column1, b.column2 FROM table_a a JOIN table_b b ON a.id = b.a_id;<\/code><\/pre>\n
4. \u512a\u5316WHERE\u689d\u4ef6<\/h2>\n
\u5728WHERE\u5b50\u53e5\u4e2d\u4f7f\u7528\u9069\u7576\u7684\u689d\u4ef6\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u61c9\u907f\u514d\u4f7f\u7528\u4e0d\u5fc5\u8981\u7684\u51fd\u6578\u6216\u8a08\u7b97\uff0c\u56e0\u70ba\u9019\u6703\u5c0e\u81f4\u5168\u8868\u6383\u63cf\u3002<\/p>\n
SELECT * FROM table_name WHERE column_name = 'value';<\/code><\/pre>\n
5. \u4f7f\u7528LIMIT\u9650\u5236\u7d50\u679c\u96c6<\/h2>\n
\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528LIMIT\u53ef\u4ee5\u9650\u5236\u8fd4\u56de\u7684\u7d50\u679c\u96c6\u5927\u5c0f\uff0c\u9019\u5c0d\u65bc\u63d0\u9ad8\u6027\u80fd\u5c24\u5176\u91cd\u8981\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u3002<\/p>\n
SELECT * FROM table_name LIMIT 10;<\/code><\/pre>\n
6. \u5b9a\u671f\u7dad\u8b77\u6578\u64da\u5eab<\/h2>\n
\u5b9a\u671f\u9032\u884c\u6578\u64da\u5eab\u7dad\u8b77\uff0c\u5982\u91cd\u5efa\u7d22\u5f15\u548c\u66f4\u65b0\u7d71\u8a08\u4fe1\u606f\uff0c\u53ef\u4ee5\u4fdd\u6301\u6578\u64da\u5eab\u7684\u6700\u4f73\u6027\u80fd\u3002\u9019\u6709\u52a9\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u66f4\u597d\u5730\u512a\u5316\u67e5\u8a62\u8a08\u5283\u3002<\/p>\n
7. \u4f7f\u7528\u9069\u7576\u7684\u6578\u64da\u985e\u578b<\/h2>\n
\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u53ef\u4ee5\u6e1b\u5c11\u5b58\u5132\u7a7a\u9593\u4e26\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u4f8b\u5982\uff0c\u5c0d\u65bc\u6574\u6578\u6578\u64da\uff0c\u61c9\u4f7f\u7528\u6574\u6578\u985e\u578b\u800c\u975e\u5b57\u7b26\u985e\u578b\u3002<\/p>\n
CREATE TABLE table_name (id INT, name VARCHAR(100));<\/code><\/pre>\n
8. \u907f\u514d\u904e\u591a\u7684\u7d22\u5f15<\/h2>\n
\u96d6\u7136\u7d22\u5f15\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u4f46\u904e\u591a\u7684\u7d22\u5f15\u6703\u5f71\u97ff\u63d2\u5165\u3001\u66f4\u65b0\u548c\u522a\u9664\u64cd\u4f5c\u7684\u6027\u80fd\u3002\u56e0\u6b64\uff0c\u61c9\u6839\u64da\u5be6\u969b\u9700\u6c42\u5408\u7406\u8a2d\u7f6e\u7d22\u5f15\u3002<\/p>\n
9. \u4f7f\u7528\u4e8b\u52d9<\/h2>\n
\u5728\u9032\u884c\u591a\u500b\u6578\u64da\u64cd\u4f5c\u6642\uff0c\u4f7f\u7528\u4e8b\u52d9\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\uff0c\u4e26\u63d0\u9ad8\u6027\u80fd\u3002\u4e8b\u52d9\u53ef\u4ee5\u6e1b\u5c11\u6578\u64da\u5eab\u7684\u9396\u5b9a\u6642\u9593\u3002<\/p>\n
BEGIN; \nUPDATE table_name SET column_name = 'value' WHERE condition; \nCOMMIT;<\/code><\/pre>\n
10. \u76e3\u63a7\u548c\u5206\u6790\u67e5\u8a62\u6027\u80fd<\/h2>\n
\u4f7f\u7528\u6578\u64da\u5eab\u63d0\u4f9b\u7684\u6027\u80fd\u76e3\u63a7\u5de5\u5177\uff0c\u5b9a\u671f\u5206\u6790\u67e5\u8a62\u6027\u80fd\uff0c\u627e\u51fa\u74f6\u9838\u4e26\u9032\u884c\u512a\u5316\u3002\u9019\u6a23\u53ef\u4ee5\u6301\u7e8c\u6539\u9032\u6578\u64da\u5eab\u7684\u6027\u80fd\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
SQL\u6027\u80fd\u512a\u5316\u662f\u4e00\u500b\u6301\u7e8c\u7684\u904e\u7a0b\uff0c\u901a\u904e\u4e0a\u8ff0\u5341\u689d\u63aa\u65bd\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u6548\u7387\u3002\u7121\u8ad6\u662f\u4f7f\u7528\u9999\u6e2fVPS<\/a>\u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\u914d\u7f6e\u548c\u512a\u5316\u7b56\u7565\u90fd\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u6301\u7e8c\u76e3\u63a7\u548c\u8abf\u6574\u5c07\u6709\u52a9\u65bc\u78ba\u4fdd\u6578\u64da\u5eab\u5728\u9ad8\u8ca0\u8f09\u4e0b\u7684\u7a69\u5b9a\u904b\u884c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22\u5341\u689dSQL\u6027\u80fd\u512a\u5316\u63aa\u65bd\uff0c\u63d0\u5347\u67e5\u8a62\u6548\u7387\uff0c\u6e1b\u5c11\u8cc7\u6e90\u6d88\u8017\uff0c\u52a9\u529b\u6578\u64da\u5eab\u904b\u884c\u66f4\u6d41\u66a2\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-171365","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/171365","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=171365"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/171365\/revisions"}],"predecessor-version":[{"id":171366,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/171365\/revisions\/171366"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=171365"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=171365"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=171365"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}