{"id":144059,"date":"2024-11-01T03:51:22","date_gmt":"2024-10-31T19:51:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/144059\/"},"modified":"2024-11-01T03:51:23","modified_gmt":"2024-10-31T19:51:23","slug":"sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84%e5%ad%97%e7%ac%a6%e7%9b%b8%e7%ad%89%e6%af%94%e8%bc%83%ef%bc%9a%e6%98%af%e5%90%a6%e4%bd%bf%e7%94%a8%e5%91%bd%e4%bb%a4%ef%bc%9f-sql-%e6%95%b8%e6%93%9a","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/144059\/","title":{"rendered":"SQL \u6578\u64da\u5eab\u4e2d\u7684\u5b57\u7b26\u76f8\u7b49\u6bd4\u8f03\uff1a\u662f\u5426\u4f7f\u7528\u547d\u4ee4\uff1f (sql \u6578\u64da\u5eab\u5b57\u7b26\u76f8\u7b49\u662f\u5426\u547d\u4ee4)"},"content":{"rendered":"

SQL \u6578\u64da\u5eab\u4e2d\u7684\u5b57\u7b26\u76f8\u7b49\u6bd4\u8f03\uff1a\u662f\u5426\u4f7f\u7528\u547d\u4ee4\uff1f<\/h1>\n

\u5728 SQL \u6578\u64da\u5eab\u4e2d\uff0c\u5b57\u7b26\u76f8\u7b49\u6bd4\u8f03\u662f\u4e00\u500b\u57fa\u672c\u800c\u91cd\u8981\u7684\u64cd\u4f5c\u3002\u7121\u8ad6\u662f\u5728\u67e5\u8a62\u6578\u64da\u3001\u66f4\u65b0\u8a18\u9304\u9084\u662f\u9032\u884c\u6578\u64da\u5206\u6790\u6642\uff0c\u7406\u89e3\u5b57\u7b26\u76f8\u7b49\u7684\u6bd4\u8f03\u65b9\u5f0f\u90fd\u81f3\u95dc\u91cd\u8981\u3002\u672c\u6587\u5c07\u63a2\u8a0e SQL \u6578\u64da\u5eab\u4e2d\u5b57\u7b26\u76f8\u7b49\u6bd4\u8f03\u7684\u4e0d\u540c\u65b9\u6cd5\uff0c\u4e26\u5206\u6790\u662f\u5426\u9700\u8981\u4f7f\u7528\u547d\u4ee4\u4f86\u9032\u884c\u9019\u4e9b\u6bd4\u8f03\u3002<\/p>\n

\u5b57\u7b26\u76f8\u7b49\u6bd4\u8f03\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n

\u5b57\u7b26\u76f8\u7b49\u6bd4\u8f03\u662f\u6307\u5728 SQL \u67e5\u8a62\u4e2d\u6aa2\u67e5\u5169\u500b\u5b57\u7b26\u4e32\u662f\u5426\u76f8\u7b49\u3002\u9019\u901a\u5e38\u6d89\u53ca\u5230\u4f7f\u7528\u7b49\u865f\uff08=\uff09\u904b\u7b97\u7b26\u4f86\u9032\u884c\u6bd4\u8f03\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b SQL \u67e5\u8a62\u5c07\u6aa2\u7d22\u6240\u6709\u540d\u70ba “John” \u7684\u7528\u6236\uff1a<\/p>\n

SELECT * FROM users WHERE name = 'John';<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0cSQL \u5f15\u64ce\u6703\u6aa2\u67e5 “name” \u5217\u4e2d\u7684\u6bcf\u500b\u503c\uff0c\u4e26\u8fd4\u56de\u6240\u6709\u8207 “John” \u76f8\u7b49\u7684\u8a18\u9304\u3002<\/p>\n
\u5b57\u7b26\u6bd4\u8f03\u7684\u5927\u5c0f\u5beb\u654f\u611f\u6027<\/h2>\n
\u5728 SQL \u4e2d\uff0c\u5b57\u7b26\u76f8\u7b49\u6bd4\u8f03\u7684\u5927\u5c0f\u5beb\u654f\u611f\u6027\u53d6\u6c7a\u65bc\u6578\u64da\u5eab\u7684\u8a2d\u7f6e\u548c\u5b57\u7b26\u96c6\u7684\u4f7f\u7528\u3002\u4f8b\u5982\uff0c\u5728 MySQL \u4e2d\uff0c\u9ed8\u8a8d\u60c5\u6cc1\u4e0b\uff0c\u5b57\u7b26\u6bd4\u8f03\u662f\u5927\u5c0f\u5beb\u4e0d\u654f\u611f\u7684\uff0c\u9019\u610f\u5473\u8457 “john” \u548c “John” \u88ab\u8996\u70ba\u76f8\u7b49\u3002\u7136\u800c\uff0c\u9019\u53ef\u4ee5\u901a\u904e\u4f7f\u7528\u4e8c\u9032\u5236\u5b57\u7b26\u96c6\u6216\u7279\u5b9a\u7684 COLLATION \u4f86\u6539\u8b8a\u3002<\/p>\n
SELECT * FROM users WHERE BINARY name = 'John';<\/code><\/pre>\n
\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c\u4f7f\u7528\u4e86 BINARY \u95dc\u9375\u5b57\uff0c\u9019\u5c07\u4f7f\u6bd4\u8f03\u8b8a\u5f97\u5927\u5c0f\u5beb\u654f\u611f\u3002<\/p>\n
\u4f7f\u7528\u547d\u4ee4\u9032\u884c\u5b57\u7b26\u76f8\u7b49\u6bd4\u8f03<\/h2>\n
\u5728 SQL \u4e2d\uff0c\u5b57\u7b26\u76f8\u7b49\u6bd4\u8f03\u901a\u5e38\u4e0d\u9700\u8981\u984d\u5916\u7684\u547d\u4ee4\u3002\u4f7f\u7528\u7b49\u865f\u904b\u7b97\u7b26\uff08=\uff09\u5df2\u7d93\u8db3\u5920\u3002\u7136\u800c\uff0c\u6839\u64da\u9700\u6c42\uff0c\u958b\u767c\u8005\u53ef\u80fd\u6703\u9078\u64c7\u4f7f\u7528\u5176\u4ed6\u51fd\u6578\u4f86\u9032\u884c\u66f4\u8907\u96dc\u7684\u6bd4\u8f03\u3002\u4f8b\u5982\uff0c\u4f7f\u7528 LIKE<\/code> \u547d\u4ee4\u53ef\u4ee5\u9032\u884c\u6a21\u5f0f\u5339\u914d\uff1a<\/p>\n
SELECT * FROM users WHERE name LIKE 'J%';<\/code><\/pre>\n
\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u4ee5 “J” \u958b\u982d\u7684\u7528\u6236\u540d\u3002\u9019\u7a2e\u65b9\u5f0f\u5728\u9700\u8981\u9032\u884c\u90e8\u5206\u5339\u914d\u6642\u975e\u5e38\u6709\u7528\u3002<\/p>\n
\u5b57\u7b26\u76f8\u7b49\u6bd4\u8f03\u7684\u6027\u80fd\u8003\u91cf<\/h2>\n
\u5728\u9032\u884c\u5b57\u7b26\u76f8\u7b49\u6bd4\u8f03\u6642\uff0c\u6027\u80fd\u662f\u4e00\u500b\u91cd\u8981\u7684\u8003\u91cf\u56e0\u7d20\u3002\u5c0d\u65bc\u5927\u578b\u6578\u64da\u96c6\uff0c\u4f7f\u7528\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u78ba\u4fdd\u5728\u9700\u8981\u9032\u884c\u5b57\u7b26\u6bd4\u8f03\u7684\u5217\u4e0a\u5275\u5efa\u7d22\u5f15\uff0c\u53ef\u4ee5\u52a0\u5feb\u67e5\u8a62\u901f\u5ea6\u3002\u4f8b\u5982\uff1a<\/p>\n
CREATE INDEX idx_name ON users(name);<\/code><\/pre>\n
\u9019\u6a23\uff0c\u7576\u57f7\u884c\u5b57\u7b26\u76f8\u7b49\u6bd4\u8f03\u6642\uff0c\u6578\u64da\u5eab\u53ef\u4ee5\u66f4\u5feb\u5730\u5b9a\u4f4d\u5230\u76f8\u95dc\u8a18\u9304\u3002<\/p>\n
\u7d50\u8ad6<\/h2>\n
\u5728 SQL \u6578\u64da\u5eab\u4e2d\uff0c\u5b57\u7b26\u76f8\u7b49\u6bd4\u8f03\u662f\u4e00\u500b\u57fa\u672c\u7684\u64cd\u4f5c\uff0c\u901a\u5e38\u4e0d\u9700\u8981\u984d\u5916\u7684\u547d\u4ee4\u3002\u4f7f\u7528\u7b49\u865f\u904b\u7b97\u7b26\uff08=\uff09\u5df2\u7d93\u80fd\u5920\u6eff\u8db3\u5927\u591a\u6578\u9700\u6c42\u3002\u7136\u800c\uff0c\u6839\u64da\u5177\u9ad4\u60c5\u6cc1\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u9078\u64c7\u4f7f\u7528\u5176\u4ed6\u51fd\u6578\u4f86\u9032\u884c\u66f4\u8907\u96dc\u7684\u6bd4\u8f03\u3002\u4e86\u89e3\u5b57\u7b26\u6bd4\u8f03\u7684\u5927\u5c0f\u5beb\u654f\u611f\u6027\u548c\u6027\u80fd\u8003\u91cf\uff0c\u5c0d\u65bc\u512a\u5316\u6578\u64da\u5eab\u67e5\u8a62\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u5eab\u9700\u6c42\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u5e6b\u52a9\u60a8\u8f15\u9b06\u7ba1\u7406\u548c\u512a\u5316\u60a8\u7684\u6578\u64da\u5eab\u6027\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22 SQL \u6578\u64da\u5eab\u4e2d\u5b57\u7b26\u76f8\u7b49\u6bd4\u8f03\u7684\u547d\u4ee4\u4f7f\u7528\uff0c\u4e86\u89e3\u5982\u4f55\u6709\u6548\u9032\u884c\u5b57\u7b26\u5339\u914d\u548c\u67e5\u8a62\u512a\u5316\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-144059","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/144059","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=144059"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/144059\/revisions"}],"predecessor-version":[{"id":144060,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/144059\/revisions\/144060"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=144059"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=144059"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=144059"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}