{"id":80896,"date":"2024-10-16T14:50:13","date_gmt":"2024-10-16T06:50:13","guid":{"rendered":"https:\/\/server.hk\/cnblog\/80896\/"},"modified":"2024-10-16T14:50:13","modified_gmt":"2024-10-16T06:50:13","slug":"mysql%e5%ad%97%e7%ac%a6%e4%b8%b2%e4%b8%ad%e6%95%b8%e5%ad%97%e6%8e%92%e5%ba%8f%e7%9a%84%e5%95%8f%e9%a1%8c","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/80896\/","title":{"rendered":"MySQL\u5b57\u7b26\u4e32\u4e2d\u6578\u5b57\u6392\u5e8f\u7684\u554f\u984c"},"content":{"rendered":"

MySQL\u5b57\u7b26\u4e32\u4e2d\u6578\u5b57\u6392\u5e8f\u7684\u554f\u984c<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u6392\u5e8f\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\uff0c\u5c24\u5176\u662f\u5728\u8655\u7406\u5b57\u7b26\u4e32\u6642\u3002MySQL\u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u6392\u5e8f\u65b9\u6cd5\uff0c\u4f46\u5728\u5b57\u7b26\u4e32\u4e2d\u5305\u542b\u6578\u5b57\u7684\u60c5\u6cc1\u4e0b\uff0c\u6392\u5e8f\u7684\u884c\u70ba\u53ef\u80fd\u6703\u8b93\u4eba\u611f\u5230\u56f0\u60d1\u3002\u672c\u6587\u5c07\u63a2\u8a0eMySQL\u5728\u5b57\u7b26\u4e32\u4e2d\u6578\u5b57\u6392\u5e8f\u7684\u554f\u984c\uff0c\u4e26\u63d0\u4f9b\u89e3\u6c7a\u65b9\u6848\u548c\u793a\u4f8b\u3002<\/p>\n

\u5b57\u7b26\u4e32\u6392\u5e8f\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n

\u5728MySQL\u4e2d\uff0c\u5b57\u7b26\u4e32\u7684\u6392\u5e8f\u662f\u57fa\u65bc\u5b57\u5178\u9806\u5e8f\u9032\u884c\u7684\u3002\u9019\u610f\u5473\u8457\uff0c\u7576\u5b57\u7b26\u4e32\u4e2d\u5305\u542b\u6578\u5b57\u6642\uff0c\u9019\u4e9b\u6578\u5b57\u6703\u88ab\u8996\u70ba\u5b57\u7b26\uff0c\u800c\u4e0d\u662f\u6578\u503c\u3002\u4f8b\u5982\uff0c\u5b57\u7b26\u4e32\u201c10\u201d\u6703\u6392\u5728\u201c2\u201d\u4e4b\u524d\uff0c\u56e0\u70ba\u5728\u5b57\u5178\u9806\u5e8f\u4e2d\uff0c\u5b57\u7b26\u201c1\u201d\u6bd4\u5b57\u7b26\u201c2\u201d\u5c0f\u3002<\/p>\n

\u554f\u984c\u793a\u4f8b<\/h2>\n

\u8003\u616e\u4ee5\u4e0b\u6578\u64da\u8868\uff0c\u540d\u70ba\u201citems\u201d\uff0c\u5176\u4e2d\u5305\u542b\u4e00\u5217\u201citem_name\u201d\uff1a<\/p>\n

\n+------------+\n| item_name  |\n+------------+\n| item1     |\n| item10    |\n| item2     |\n| item20    |\n| item3     |\n+------------+\n<\/pre>\n
\u5982\u679c\u6211\u5011\u57f7\u884c\u4ee5\u4e0b\u67e5\u8a62\u4f86\u6392\u5e8f\u9019\u4e9b\u9805\u76ee\uff1a<\/p>\n
\nSELECT item_name FROM items ORDER BY item_name;\n<\/pre>\n
\u7d50\u679c\u5c07\u662f\uff1a<\/p>\n
\n+------------+\n| item_name  |\n+------------+\n| item1     |\n| item10    |\n| item2     |\n| item20    |\n| item3     |\n+------------+\n<\/pre>\n
\u5982\u4e0a\u6240\u793a\uff0c\u6392\u5e8f\u7d50\u679c\u4e26\u4e0d\u7b26\u5408\u6211\u5011\u7684\u9810\u671f\uff0c\u56e0\u70ba\u201citem10\u201d\u6392\u5728\u201citem2\u201d\u4e4b\u524d\u3002<\/p>\n
\u89e3\u6c7a\u65b9\u6848\uff1a\u4f7f\u7528CAST\u51fd\u6578<\/h2>\n
\u70ba\u4e86\u89e3\u6c7a\u9019\u500b\u554f\u984c\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528MySQL\u7684CAST\u51fd\u6578\u5c07\u5b57\u7b26\u4e32\u4e2d\u7684\u6578\u5b57\u90e8\u5206\u8f49\u63db\u70ba\u6574\u6578\u3002\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6578\u5b57\u6309\u7167\u6578\u503c\u5927\u5c0f\u9032\u884c\u6392\u5e8f\uff0c\u800c\u4e0d\u662f\u5b57\u5178\u9806\u5e8f\u3002<\/p>\n
\u4ee5\u4e0b\u662f\u4fee\u6539\u5f8c\u7684\u67e5\u8a62\u793a\u4f8b\uff1a<\/p>\n
\nSELECT item_name \nFROM items \nORDER BY CAST(SUBSTRING(item_name, 5) AS UNSIGNED);\n<\/pre>\n
\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c\u6211\u5011\u4f7f\u7528SUBSTRING\u51fd\u6578\u63d0\u53d6\u5b57\u7b26\u4e32\u4e2d\u7684\u6578\u5b57\u90e8\u5206\uff0c\u7136\u5f8c\u4f7f\u7528CAST\u5c07\u5176\u8f49\u63db\u70ba\u7121\u7b26\u865f\u6574\u6578\u3002\u9019\u6a23\uff0c\u6392\u5e8f\u7d50\u679c\u5c07\u6703\u662f\uff1a<\/p>\n
\n+------------+\n| item_name  |\n+------------+\n| item1     |\n| item2     |\n| item3     |\n| item10    |\n| item20    |\n+------------+\n<\/pre>\n
\u5176\u4ed6\u8003\u616e\u56e0\u7d20<\/h2>\n
\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0c\u5b57\u7b26\u4e32\u7684\u683c\u5f0f\u53ef\u80fd\u6703\u6709\u6240\u4e0d\u540c\uff0c\u56e0\u6b64\u5728\u4f7f\u7528SUBSTRING\u51fd\u6578\u6642\u9700\u8981\u6839\u64da\u5177\u9ad4\u60c5\u6cc1\u9032\u884c\u8abf\u6574\u3002\u6b64\u5916\uff0c\u5c0d\u65bc\u66f4\u8907\u96dc\u7684\u5b57\u7b26\u4e32\u7d50\u69cb\uff0c\u53ef\u80fd\u9700\u8981\u4f7f\u7528\u6b63\u5247\u8868\u9054\u5f0f\u4f86\u63d0\u53d6\u6578\u5b57\u90e8\u5206\u3002<\/p>\n
\u7d50\u8ad6<\/h2>\n
\u5728MySQL\u4e2d\uff0c\u5b57\u7b26\u4e32\u4e2d\u6578\u5b57\u7684\u6392\u5e8f\u554f\u984c\u4e3b\u8981\u662f\u7531\u65bc\u5b57\u5178\u9806\u5e8f\u7684\u7279\u6027\u9020\u6210\u7684\u3002\u901a\u904e\u4f7f\u7528CAST\u548cSUBSTRING\u51fd\u6578\uff0c\u6211\u5011\u53ef\u4ee5\u6709\u6548\u5730\u89e3\u6c7a\u9019\u4e00\u554f\u984c\uff0c\u78ba\u4fdd\u6578\u5b57\u6309\u7167\u6578\u503c\u5927\u5c0f\u9032\u884c\u6392\u5e8f\u3002\u9019\u5c0d\u65bc\u9700\u8981\u7cbe\u78ba\u6392\u5e8f\u7684\u61c9\u7528\u5834\u666f\u5c24\u70ba\u91cd\u8981\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\u6258\u7ba1\u60a8\u7684MySQL\u6578\u64da\u5eab\uff0c\u9019\u5c07\u70ba\u60a8\u7684\u61c9\u7528\u63d0\u4f9b\u7a69\u5b9a\u7684\u6027\u80fd\u548c\u9748\u6d3b\u7684\u64f4\u5c55\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u8a0eMySQL\u4e2d\u5b57\u7b26\u4e32\u6578\u5b57\u6392\u5e8f\u7684\u6311\u6230\uff0c\u63d0\u4f9b\u89e3\u6c7a\u65b9\u6848\u4ee5\u78ba\u4fdd\u6b63\u78ba\u7684\u6578\u5b57\u9806\u5e8f\u986f\u793a\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-80896","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/80896","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=80896"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/80896\/revisions"}],"predecessor-version":[{"id":80897,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/80896\/revisions\/80897"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=80896"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=80896"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=80896"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}