{"id":175589,"date":"2024-11-08T07:08:17","date_gmt":"2024-11-07T23:08:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/175589\/"},"modified":"2024-11-08T07:08:17","modified_gmt":"2024-11-07T23:08:17","slug":"%e5%a6%82%e4%bd%95%e9%80%9a%e9%81%8e%e5%91%bd%e4%bb%a4%e6%89%93%e9%96%8b%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%ef%bc%9f-%e7%94%a8%e5%91%bd%e4%bb%a4%e6%89%93%e9%96%8b%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/175589\/","title":{"rendered":"\u5982\u4f55\u901a\u904e\u547d\u4ee4\u6253\u958b\u6578\u64da\u5eab\u8868\uff1f (\u7528\u547d\u4ee4\u6253\u958b\u6578\u64da\u5eab\u8868)"},"content":{"rendered":"

\u5982\u4f55\u901a\u904e\u547d\u4ee4\u6253\u958b\u6578\u64da\u5eab\u8868\uff1f<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u80fd\u5920\u901a\u904e\u547d\u4ee4\u884c\u64cd\u4f5c\u6578\u64da\u5eab\u8868\u662f\u4e00\u9805\u57fa\u672c\u800c\u91cd\u8981\u7684\u6280\u80fd\u3002\u7121\u8ad6\u662f\u4f7f\u7528 MySQL\u3001PostgreSQL \u9084\u662f\u5176\u4ed6\u6578\u64da\u5eab\u7cfb\u7d71\uff0c\u547d\u4ee4\u884c\u90fd\u63d0\u4f9b\u4e86\u4e00\u7a2e\u9ad8\u6548\u4e14\u9748\u6d3b\u7684\u65b9\u5f0f\u4f86\u7ba1\u7406\u6578\u64da\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u901a\u904e\u547d\u4ee4\u6253\u958b\u6578\u64da\u5eab\u8868\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u6280\u5de7\u3002<\/p>\n

1. \u9023\u63a5\u5230\u6578\u64da\u5eab<\/h2>\n

\u5728\u57f7\u884c\u4efb\u4f55\u547d\u4ee4\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u9023\u63a5\u5230\u6578\u64da\u5eab\u3002\u4ee5 MySQL \u70ba\u4f8b\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u9023\u63a5\u5230\u6578\u64da\u5eab\uff1a<\/p>\n

mysql -u \u7528\u6236\u540d -p<\/code><\/pre>\n
\u57f7\u884c\u6b64\u547d\u4ee4\u5f8c\uff0c\u7cfb\u7d71\u6703\u63d0\u793a\u60a8\u8f38\u5165\u5bc6\u78bc\u3002\u6210\u529f\u767b\u9304\u5f8c\uff0c\u60a8\u5c07\u9032\u5165 MySQL \u547d\u4ee4\u884c\u754c\u9762\u3002<\/p>\n
2. \u9078\u64c7\u6578\u64da\u5eab<\/h2>\n
\u9023\u63a5\u5230\u6578\u64da\u5eab\u5f8c\uff0c\u60a8\u9700\u8981\u9078\u64c7\u8981\u64cd\u4f5c\u7684\u6578\u64da\u5eab\u3002\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u4f86\u9078\u64c7\u6578\u64da\u5eab\uff1a<\/p>\n
USE \u6578\u64da\u5eab\u540d\u7a31;<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u5982\u679c\u60a8\u7684\u6578\u64da\u5eab\u540d\u7a31\u70ba `my_database`\uff0c\u5247\u547d\u4ee4\u70ba\uff1a<\/p>\n
USE my_database;<\/code><\/pre>\n
3. \u67e5\u770b\u6578\u64da\u5eab\u4e2d\u7684\u8868<\/h2>\n
\u5728\u9078\u64c7\u4e86\u6578\u64da\u5eab\u5f8c\uff0c\u60a8\u53ef\u4ee5\u67e5\u770b\u8a72\u6578\u64da\u5eab\u4e2d\u7684\u6240\u6709\u8868\u3002\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n
SHOW TABLES;<\/code><\/pre>\n
\u9019\u5c07\u5217\u51fa\u6240\u6709\u8868\u7684\u540d\u7a31\uff0c\u60a8\u53ef\u4ee5\u6839\u64da\u9700\u8981\u9078\u64c7\u8981\u67e5\u770b\u7684\u8868\u3002<\/p>\n
4. \u6253\u958b\u6578\u64da\u5eab\u8868<\/h2>\n
\u8981\u67e5\u770b\u7279\u5b9a\u8868\u7684\u5167\u5bb9\uff0c\u53ef\u4ee5\u4f7f\u7528 `SELECT` \u8a9e\u53e5\u3002\u4ee5\u4e0b\u662f\u57fa\u672c\u7684\u8a9e\u6cd5\uff1a<\/p>\n
SELECT * FROM \u8868\u540d\u7a31;<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u5982\u679c\u60a8\u60f3\u67e5\u770b\u540d\u70ba `users` \u7684\u8868\u7684\u6240\u6709\u6578\u64da\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n
SELECT * FROM users;<\/code><\/pre>\n
\u9019\u5c07\u986f\u793a `users` \u8868\u4e2d\u7684\u6240\u6709\u884c\u548c\u5217\u3002<\/p>\n
5. \u9650\u5236\u67e5\u8a62\u7d50\u679c<\/h2>\n
\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u60a8\u53ef\u80fd\u53ea\u60f3\u67e5\u770b\u8868\u4e2d\u7684\u90e8\u5206\u6578\u64da\u3002\u53ef\u4ee5\u4f7f\u7528 `LIMIT` \u5b50\u53e5\u4f86\u9650\u5236\u67e5\u8a62\u7d50\u679c\u7684\u6578\u91cf\u3002\u4f8b\u5982\uff1a<\/p>\n
SELECT * FROM users LIMIT 10;<\/code><\/pre>\n
\u9019\u5c07\u50c5\u986f\u793a `users` \u8868\u4e2d\u7684\u524d 10 \u884c\u6578\u64da\u3002<\/p>\n
6. \u689d\u4ef6\u67e5\u8a62<\/h2>\n
\u5982\u679c\u60a8\u53ea\u60f3\u67e5\u770b\u7b26\u5408\u7279\u5b9a\u689d\u4ef6\u7684\u6578\u64da\uff0c\u53ef\u4ee5\u4f7f\u7528 `WHERE` \u5b50\u53e5\u3002\u4f8b\u5982\uff0c\u5982\u679c\u60a8\u60f3\u67e5\u627e\u6240\u6709\u5e74\u9f61\u5927\u65bc 18 \u6b72\u7684\u7528\u6236\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n
SELECT * FROM users WHERE age > 18;<\/code><\/pre>\n
7. \u6578\u64da\u6392\u5e8f<\/h2>\n
\u60a8\u9084\u53ef\u4ee5\u5c0d\u67e5\u8a62\u7d50\u679c\u9032\u884c\u6392\u5e8f\uff0c\u4f7f\u7528 `ORDER BY` \u5b50\u53e5\u3002\u4f8b\u5982\uff0c\u6309\u5e74\u9f61\u5347\u5e8f\u6392\u5217\u7528\u6236\uff1a<\/p>\n
SELECT * FROM users ORDER BY age ASC;<\/code><\/pre>\n
\u5982\u679c\u8981\u6309\u5e74\u9f61\u964d\u5e8f\u6392\u5217\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n
SELECT * FROM users ORDER BY age DESC;<\/code><\/pre>\n
8. \u7e3d\u7d50<\/h2>\n
\u901a\u904e\u547d\u4ee4\u884c\u6253\u958b\u6578\u64da\u5eab\u8868\u662f\u4e00\u9805\u975e\u5e38\u5be6\u7528\u7684\u6280\u80fd\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5feb\u901f\u67e5\u8a62\u548c\u7ba1\u7406\u6578\u64da\u3002\u7121\u8ad6\u662f\u57fa\u672c\u7684\u67e5\u8a62\u9084\u662f\u8907\u96dc\u7684\u689d\u4ef6\u904e\u6ffe\uff0c\u547d\u4ee4\u884c\u90fd\u63d0\u4f9b\u4e86\u9748\u6d3b\u7684\u89e3\u6c7a\u65b9\u6848\u3002\u638c\u63e1\u9019\u4e9b\u57fa\u672c\u547d\u4ee4\u5f8c\uff0c\u60a8\u5c07\u80fd\u5920\u66f4\u6709\u6548\u5730\u8207\u6578\u64da\u5eab\u9032\u884c\u4e92\u52d5\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u904b\u884c\u60a8\u7684\u6578\u64da\u5eab\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u7528\u6236\u3002\u7121\u8ad6\u662f \u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5b78\u7fd2\u5982\u4f55\u901a\u904e\u547d\u4ee4\u884c\u8f15\u9b06\u6253\u958b\u6578\u64da\u5eab\u8868\uff0c\u638c\u63e1\u57fa\u672c\u6307\u4ee4\u548c\u6280\u5de7\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\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-175589","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/175589","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=175589"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/175589\/revisions"}],"predecessor-version":[{"id":175590,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/175589\/revisions\/175590"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=175589"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=175589"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=175589"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}