{"id":96854,"date":"2024-10-20T12:55:20","date_gmt":"2024-10-20T04:55:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/96854\/"},"modified":"2024-10-20T12:55:20","modified_gmt":"2024-10-20T04:55:20","slug":"postgresql-42p22-%e4%b8%8d%e7%a2%ba%e5%ae%9a%e7%9a%84%e6%8e%92%e5%ba%8f-%e6%8a%a5%e9%94%99-%e6%95%85%e9%9a%9c%e4%bf%ae%e5%a4%8d-%e8%bf%9c%e7%a8%8b%e5%a4%84%e7%90%86","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/96854\/","title":{"rendered":"PostgreSQL 42P22: \u4e0d\u78ba\u5b9a\u7684\u6392\u5e8f \u62a5\u9519 \u6545\u969c\u4fee\u590d \u8fdc\u7a0b\u5904\u7406"},"content":{"rendered":"<h1 id=\"postgresql-42p22-%e4%b8%8d%e7%a2%ba%e5%ae%9a%e7%9a%84%e6%8e%92%e5%ba%8f%e5%a0%b1%e9%8c%af%e6%95%85%e9%9a%9c%e4%bf%ae%e5%be%a9%e9%81%a0%e7%a8%8b%e8%99%95%e7%90%86-NqGJarOMDn\">PostgreSQL 42P22: \u4e0d\u78ba\u5b9a\u7684\u6392\u5e8f\u5831\u932f\u6545\u969c\u4fee\u5fa9\u9060\u7a0b\u8655\u7406<\/h1>\n<p>\u5728\u4f7f\u7528 PostgreSQL \u6578\u64da\u5eab\u6642\uff0c\u958b\u767c\u8005\u53ef\u80fd\u6703\u9047\u5230\u5404\u7a2e\u932f\u8aa4\uff0c\u5176\u4e2d\u4e4b\u4e00\u4fbf\u662f 42P22 \u932f\u8aa4\uff0c\u9019\u901a\u5e38\u8207\u4e0d\u78ba\u5b9a\u7684\u6392\u5e8f\u6709\u95dc\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u4e00\u932f\u8aa4\u7684\u6210\u56e0\u3001\u5f71\u97ff\u4ee5\u53ca\u5982\u4f55\u9032\u884c\u6545\u969c\u4fee\u5fa9\uff0c\u7279\u5225\u662f\u5728\u9060\u7a0b\u74b0\u5883\u4e2d\u7684\u8655\u7406\u65b9\u5f0f\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-42p22-%e9%8c%af%e8%aa%a4%ef%bc%9f-NqGJarOMDn\">\u4ec0\u9ebc\u662f 42P22 \u932f\u8aa4\uff1f<\/h2>\n<p>PostgreSQL \u7684 42P22 \u932f\u8aa4\u4ee3\u78bc\u8868\u793a\u300c\u4e0d\u78ba\u5b9a\u7684\u6392\u5e8f\u300d\u3002\u9019\u901a\u5e38\u767c\u751f\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528\u4e86\u4e0d\u660e\u78ba\u7684\u6392\u5e8f\u689d\u4ef6\uff0c\u5c0e\u81f4\u6578\u64da\u5eab\u7121\u6cd5\u78ba\u5b9a\u5982\u4f55\u5c0d\u7d50\u679c\u9032\u884c\u6392\u5e8f\u3002\u9019\u7a2e\u60c5\u6cc1\u5e38\u898b\u65bc\u4f7f\u7528\u4e86\u591a\u500b\u6392\u5e8f\u689d\u4ef6\uff0c\u4f46\u5176\u4e2d\u67d0\u4e9b\u689d\u4ef6\u7684\u6392\u5e8f\u65b9\u5f0f\u4e0d\u4e00\u81f4\uff0c\u6216\u8005\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528\u4e86\u4e0d\u652f\u6301\u7684\u6578\u64da\u985e\u578b\u3002<\/p>\n<h2 id=\"%e9%8c%af%e8%aa%a4%e7%9a%84%e6%88%90%e5%9b%a0-NqGJarOMDn\">\u932f\u8aa4\u7684\u6210\u56e0<\/h2>\n<ul>\n<li><strong>\u591a\u91cd\u6392\u5e8f\u689d\u4ef6\uff1a<\/strong>\u7576\u67e5\u8a62\u4e2d\u5305\u542b\u591a\u500b\u6392\u5e8f\u689d\u4ef6\u6642\uff0c\u5982\u679c\u9019\u4e9b\u689d\u4ef6\u4e4b\u9593\u5b58\u5728\u885d\u7a81\uff0c\u5247\u53ef\u80fd\u5c0e\u81f4\u4e0d\u78ba\u5b9a\u7684\u6392\u5e8f\u3002<\/li>\n<li><strong>\u4e0d\u652f\u6301\u7684\u6578\u64da\u985e\u578b\uff1a<\/strong>\u67d0\u4e9b\u6578\u64da\u985e\u578b\u5728\u6392\u5e8f\u6642\u53ef\u80fd\u6703\u51fa\u73fe\u554f\u984c\uff0c\u4f8b\u5982\u81ea\u5b9a\u7fa9\u985e\u578b\u6216\u8907\u96dc\u7684\u6578\u64da\u7d50\u69cb\u3002<\/li>\n<li><strong>\u7f3a\u5c11\u660e\u78ba\u7684\u6392\u5e8f\u898f\u5247\uff1a<\/strong>\u5982\u679c\u5728\u67e5\u8a62\u4e2d\u672a\u660e\u78ba\u6307\u5b9a\u6392\u5e8f\u898f\u5247\uff0cPostgreSQL \u53ef\u80fd\u7121\u6cd5\u78ba\u5b9a\u5982\u4f55\u9032\u884c\u6392\u5e8f\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9-42p22-%e9%8c%af%e8%aa%a4-NqGJarOMDn\">\u5982\u4f55\u4fee\u5fa9 42P22 \u932f\u8aa4<\/h2>\n<p>\u4fee\u5fa9 42P22 \u932f\u8aa4\u7684\u7b2c\u4e00\u6b65\u662f\u78ba\u5b9a\u67e5\u8a62\u4e2d\u5c0e\u81f4\u554f\u984c\u7684\u6392\u5e8f\u689d\u4ef6\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u89e3\u6c7a\u65b9\u6848\uff1a<\/p>\n<h3 id=\"1-%e6%aa%a2%e6%9f%a5%e6%8e%92%e5%ba%8f%e6%a2%9d%e4%bb%b6-NqGJarOMDn\">1. \u6aa2\u67e5\u6392\u5e8f\u689d\u4ef6<\/h3>\n<p>\u4ed4\u7d30\u6aa2\u67e5 SQL \u67e5\u8a62\u4e2d\u7684\u6392\u5e8f\u689d\u4ef6\uff0c\u78ba\u4fdd\u6240\u6709\u689d\u4ef6\u90fd\u662f\u4e00\u81f4\u7684\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT * FROM users ORDER BY last_name, first_name;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u78ba\u4fdd last_name \u548c first_name \u7684\u6392\u5e8f\u65b9\u5f0f\u662f\u4e00\u81f4\u7684\u3002<\/p>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8%e6%98%8e%e7%a2%ba%e7%9a%84%e6%8e%92%e5%ba%8f%e8%a6%8f%e5%89%87-NqGJarOMDn\">2. \u4f7f\u7528\u660e\u78ba\u7684\u6392\u5e8f\u898f\u5247<\/h3>\n<p>\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528 <code>COLLATE<\/code> \u4f86\u6307\u5b9a\u660e\u78ba\u7684\u6392\u5e8f\u898f\u5247\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT * FROM users ORDER BY last_name COLLATE \"C\";<\/code><\/pre>\n<h3 id=\"3-%e6%aa%a2%e6%9f%a5%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b-NqGJarOMDn\">3. \u6aa2\u67e5\u6578\u64da\u985e\u578b<\/h3>\n<p>\u78ba\u4fdd\u6240\u6709\u53c3\u8207\u6392\u5e8f\u7684\u5217\u90fd\u4f7f\u7528\u76f8\u540c\u7684\u6578\u64da\u985e\u578b\u3002\u5982\u679c\u6709\u5fc5\u8981\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>CAST<\/code> \u4f86\u8f49\u63db\u6578\u64da\u985e\u578b\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT * FROM users ORDER BY CAST(age AS INTEGER);<\/code><\/pre>\n<h2 id=\"%e9%81%a0%e7%a8%8b%e8%99%95%e7%90%86-42p22-%e9%8c%af%e8%aa%a4-NqGJarOMDn\">\u9060\u7a0b\u8655\u7406 42P22 \u932f\u8aa4<\/h2>\n<p>\u5728\u9060\u7a0b\u74b0\u5883\u4e2d\u8655\u7406 42P22 \u932f\u8aa4\u6642\uff0c\u958b\u767c\u8005\u9700\u8981\u8003\u616e\u5230\u7db2\u7d61\u5ef6\u9072\u548c\u6578\u64da\u5eab\u9023\u63a5\u7684\u7a69\u5b9a\u6027\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5efa\u8b70\uff1a<\/p>\n<ul>\n<li><strong>\u4f7f\u7528\u9023\u63a5\u6c60\uff1a<\/strong>\u78ba\u4fdd\u4f7f\u7528\u9023\u63a5\u6c60\u4f86\u7ba1\u7406\u6578\u64da\u5eab\u9023\u63a5\uff0c\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u9023\u63a5\u5ef6\u9072\u3002<\/li>\n<li><strong>\u65e5\u8a8c\u8a18\u9304\uff1a<\/strong>\u555f\u7528\u8a73\u7d30\u7684\u65e5\u8a8c\u8a18\u9304\uff0c\u4ee5\u4fbf\u5728\u51fa\u73fe\u932f\u8aa4\u6642\u80fd\u5920\u5feb\u901f\u5b9a\u4f4d\u554f\u984c\u3002<\/li>\n<li><strong>\u6e2c\u8a66\u74b0\u5883\uff1a<\/strong>\u5728\u751f\u7522\u74b0\u5883\u4e2d\u9032\u884c\u66f4\u6539\u4e4b\u524d\uff0c\u5148\u5728\u6e2c\u8a66\u74b0\u5883\u4e2d\u9a57\u8b49\u67e5\u8a62\u7684\u6b63\u78ba\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-NqGJarOMDn\">\u7e3d\u7d50<\/h2>\n<p>PostgreSQL \u7684 42P22 \u932f\u8aa4\u901a\u5e38\u8207\u4e0d\u78ba\u5b9a\u7684\u6392\u5e8f\u6709\u95dc\uff0c\u901a\u904e\u6aa2\u67e5\u6392\u5e8f\u689d\u4ef6\u3001\u4f7f\u7528\u660e\u78ba\u7684\u6392\u5e8f\u898f\u5247\u4ee5\u53ca\u78ba\u4fdd\u6578\u64da\u985e\u578b\u4e00\u81f4\u6027\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u4fee\u5fa9\u6b64\u932f\u8aa4\u3002\u5728\u9060\u7a0b\u74b0\u5883\u4e2d\uff0c\u4f7f\u7528\u9023\u63a5\u6c60\u548c\u8a73\u7d30\u7684\u65e5\u8a8c\u8a18\u9304\u5c07\u6709\u52a9\u65bc\u66f4\u5feb\u5730\u5b9a\u4f4d\u548c\u89e3\u6c7a\u554f\u984c\u3002\u5c0d\u65bc\u9700\u8981\u7a69\u5b9a\u548c\u9ad8\u6548\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u7684\u7528\u6236\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u6216 <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u5c07\u662f\u660e\u667a\u7684\u9078\u64c7\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u89e3\u51b3PostgreSQL 42P22\u4e0d\u786e\u5b9a\u6392\u5e8f\u9519\u8bef\u7684\u6545\u969c\uff0c\u63d0\u4f9b\u8fdc\u7a0b\u5904\u7406\u65b9\u6848\uff0c\u786e\u4fdd\u6570\u636e\u67e5\u8be2\u7684\u51c6\u786e\u6027\u4e0e\u7a33\u5b9a\u6027\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-96854","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96854","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=96854"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96854\/revisions"}],"predecessor-version":[{"id":96855,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96854\/revisions\/96855"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=96854"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=96854"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=96854"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}