{"id":21424,"date":"2024-01-02T09:09:21","date_gmt":"2024-01-02T09:09:21","guid":{"rendered":"https:\/\/server.hk\/blog\/21424\/"},"modified":"2024-11-14T10:34:40","modified_gmt":"2024-11-14T02:34:40","slug":"how-to-fix-postgresql-error-code-42712-duplicate_alias","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/21424\/","title":{"rendered":"\u5982\u4f55\u89e3\u6c7a PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a42712 &#8211; duplicate_alias"},"content":{"rendered":"<h1 id=\"how-to-fix-postgresql-error-code-42712-duplicate_alias-ngoulCnAzQ\">\u5982\u4f55\u89e3\u6c7a PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a42712 &#8211; duplicate_alias<\/h1>\n<p>PostgreSQL \u662f\u4e00\u6b3e\u5f37\u5927\u7684\u958b\u6e90\u95dc\u806f\u6027\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u5404\u7a2e\u61c9\u7528\u7a0b\u5f0f\u4e2d\u3002\u7136\u800c\uff0c\u548c\u6240\u6709\u8edf\u4ef6\u4e00\u6a23\uff0c\u5b83\u4e5f\u53ef\u80fd\u9047\u5230\u6703\u5f71\u97ff\u5176\u529f\u80fd\u7684\u932f\u8aa4\u3002\u5176\u4e2d\u4e00\u500b\u932f\u8aa4\u70ba PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a42712 &#8211; duplicate_alias\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u6b64\u932f\u8aa4\u7684\u6210\u56e0\u4e26\u63d0\u4f9b\u9010\u6b65\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n<h2 id=\"understanding-the-postgresql-error-code-42712-duplicate_alias-ngoulCnAzQ\">\u7406\u89e3 PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a42712 &#8211; duplicate_alias<\/h2>\n<p>\u7576\u60a8\u5617\u8a66\u57f7\u884c\u5305\u542b\u91cd\u8907\u5217\u5225\u540d\u7684\u67e5\u8a62\u6642\uff0c\u5c31\u6703\u7522\u751f PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a42712 &#8211; duplicate_alias\u3002\u5217\u5225\u540d\u7528\u65bc\u70ba\u67e5\u8a62\u7d50\u679c\u4e2d\u7684\u5217\u63d0\u4f9b\u66ff\u4ee3\u540d\u7a31\u3002\u7136\u800c\uff0cPostgreSQL \u9700\u8981\u552f\u4e00\u7684\u5225\u540d\u4ee5\u907f\u514d\u6b67\u7fa9\u3002<\/p>\n<p>\u7576\u6b64\u932f\u8aa4\u767c\u751f\u6642\uff0c\u60a8\u5c07\u6536\u5230\u985e\u4f3c\u4ee5\u4e0b\u7684\u932f\u8aa4\u6d88\u606f\uff1a<\/p>\n<p><code>ERROR: column reference \"alias_name\" is ambiguous<\/code><\/p>\n<p>\u9019\u689d\u932f\u8aa4\u6d88\u606f\u8868\u660e\uff0c\u201calias_name\u201d\u5217\u5225\u540d\u5728\u60a8\u7684\u67e5\u8a62\u4e2d\u91cd\u8907\uff0c\u5c0e\u81f4 PostgreSQL \u7121\u6cd5\u78ba\u5b9a\u60a8\u6240\u6307\u7684\u662f\u54ea\u4e00\u5217\u3002<\/p>\n<h2 id=\"causes-of-the-postgresql-error-code-42712-duplicate_alias-ngoulCnAzQ\">PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a42712 &#8211; duplicate_alias \u7684\u6210\u56e0<\/h2>\n<p>PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a42712 &#8211; duplicate_alias \u53ef\u80fd\u7531\u65bc\u591a\u7a2e\u56e0\u7d20\u9020\u6210\uff0c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u5728 SELECT \u8a9e\u53e5\u4e2d\u70ba\u591a\u500b\u5217\u4f7f\u7528\u76f8\u540c\u7684\u5225\u540d<\/li>\n<li>\u9023\u63a5\u5177\u6709\u76f8\u540c\u5217\u540d\u7684\u8868<\/li>\n<li>\u4f7f\u7528\u5177\u91cd\u8907\u5217\u5225\u540d\u7684\u5b50\u67e5\u8a62\u6216 CTE\uff08\u516c\u5171\u8868\u9054\u5f0f\uff09<\/li>\n<\/ul>\n<h2 id=\"fixing-the-postgresql-error-code-42712-duplicate_alias-ngoulCnAzQ\">\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a42712 &#8211; duplicate_alias<\/h2>\n<p>\u8981\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a42712 &#8211; duplicate_alias\uff0c\u60a8\u9700\u8981\u8b58\u5225\u67e5\u8a62\u4e2d\u7684\u91cd\u8907\u5225\u540d\u4e26\u63d0\u4f9b\u552f\u4e00\u7684\u5225\u540d\u3002\u4ee5\u4e0b\u662f\u9700\u9075\u5faa\u7684\u6b65\u9a5f\uff1a<\/p>\n<h3 id=\"step-1-identify-the-duplicate-aliases-ngoulCnAzQ\">\u6b65\u9a5f 1\uff1a\u8b58\u5225\u91cd\u8907\u5225\u540d<\/h3>\n<p>\u6aa2\u67e5\u60a8\u7684\u67e5\u8a62\uff0c\u627e\u51fa\u5177\u6709\u91cd\u8907\u5225\u540d\u7684\u5217\u6216\u8868\u9054\u5f0f\u3002\u67e5\u627e\u60a8\u662f\u5426\u5728\u591a\u500b\u5217\u4e2d\u4f7f\u7528\u4e86\u76f8\u540c\u7684\u5225\u540d\uff0c\u6216\u662f\u5426\u5728\u9023\u63a5\u8868\u6642\u6709\u5217\u540d\u76f8\u540c\u7684\u60c5\u6cc1\u3002<\/p>\n<h3 id=\"step-2-provide-unique-aliases-ngoulCnAzQ\">\u6b65\u9a5f 2\uff1a\u63d0\u4f9b\u552f\u4e00\u5225\u540d<\/h3>\n<p>\u4e00\u65e6\u8b58\u5225\u51fa\u91cd\u8907\u7684\u5225\u540d\uff0c\u4fbf\u4fee\u6539\u67e5\u8a62\uff0c\u70ba\u6bcf\u500b\u5217\u6216\u8868\u9054\u5f0f\u63d0\u4f9b\u552f\u4e00\u5225\u540d\u3002\u78ba\u4fdd\u6bcf\u500b\u5225\u540d\u5728\u67e5\u8a62\u7bc4\u570d\u5167\u90fd\u662f\u552f\u4e00\u7684\u3002<\/p>\n<h3 id=\"step-3-test-and-validate-ngoulCnAzQ\">\u6b65\u9a5f 3\uff1a\u6e2c\u8a66\u8207\u9a57\u8b49<\/h3>\n<p>\u5728\u505a\u51fa\u5fc5\u8981\u7684\u66f4\u6539\u5f8c\uff0c\u6e2c\u8a66\u60a8\u4fee\u6539\u904e\u7684\u67e5\u8a62\uff0c\u4ee5\u78ba\u4fdd PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a42712 &#8211; duplicate_alias \u4e0d\u518d\u767c\u751f\u3002\u9a57\u8b49\u7d50\u679c\u4ee5\u78ba\u4fdd\u67e5\u8a62\u80fd\u5920\u7522\u751f\u7121\u6b67\u7fa9\u7684\u671f\u671b\u8f38\u51fa\u3002<\/p>\n<h2 id=\"summary-ngoulCnAzQ\">\u7e3d\u7d50<\/h2>\n<p>PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a42712 &#8211; duplicate_alias \u53ef\u4ee5\u901a\u904e\u8b58\u5225\u4e26\u63d0\u4f9b\u552f\u4e00\u7684\u5225\u540d\u65bc\u67e5\u8a62\u4e2d\u7684\u5217\u6216\u8868\u9054\u5f0f\u4f86\u89e3\u6c7a\u3002\u6839\u64da\u672c\u6587\u6240\u8ff0\u6b65\u9a5f\uff0c\u60a8\u53ef\u4ee5\u4fee\u5fa9\u6b64\u932f\u8aa4\uff0c\u78ba\u4fdd PostgreSQL \u6578\u64da\u5eab\u7684\u9806\u5229\u904b\u884c\u3002<\/p>\n<p>\u5982\u9700\u9032\u4e00\u6b65\u4e86\u89e3 VPS \u4e3b\u6a5f\u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u8003\u616e <a href=\"https:\/\/server.hk\">\u9999\u6e2f VPS \u4e3b\u6a5f<\/a>\u3002\u6211\u5011\u53ef\u9760\u4e14\u9ad8\u6548\u7684 VPS \u4e3b\u6a5f\u670d\u52d9\u5c08\u70ba\u6eff\u8db3\u60a8\u7684\u7279\u5b9a\u9700\u6c42\u800c\u8a2d\u8a08\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u4f55\u89e3\u6c7a PostgreSQL &#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-21424","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21424","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=21424"}],"version-history":[{"count":2,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21424\/revisions"}],"predecessor-version":[{"id":24066,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21424\/revisions\/24066"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=21424"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=21424"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=21424"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}