{"id":178998,"date":"2024-11-08T22:09:17","date_gmt":"2024-11-08T14:09:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/178998\/"},"modified":"2024-11-08T22:09:19","modified_gmt":"2024-11-08T14:09:19","slug":"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9-postgresql-%e9%8c%af%e8%aa%a4%e4%bb%a3%e7%a2%bc%ef%bc%9a42712-duplicate_alias%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/178998\/","title":{"rendered":"\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a42712 &#8211; duplicate_alias\uff1f"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9-postgresql-%e9%8c%af%e8%aa%a4%e4%bb%a3%e7%a2%bc%ef%bc%9a42712-duplicate_alias%ef%bc%9f-fYjfrMCyyS\">\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a42712 &#8211; duplicate_alias\uff1f<\/h1>\n<p>\u5728\u4f7f\u7528 PostgreSQL \u6578\u64da\u5eab\u6642\uff0c\u958b\u767c\u8005\u53ef\u80fd\u6703\u9047\u5230\u5404\u7a2e\u932f\u8aa4\u4ee3\u78bc\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f\u932f\u8aa4\u4ee3\u78bc 42712\uff0c\u8a72\u932f\u8aa4\u901a\u5e38\u8868\u793a\u5b58\u5728\u91cd\u8907\u7684\u5225\u540d\uff08alias\uff09\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u500b\u932f\u8aa4\u7684\u6210\u56e0\u3001\u5f71\u97ff\u4ee5\u53ca\u5982\u4f55\u6709\u6548\u5730\u4fee\u5fa9\u5b83\u3002<\/p>\n<h2 id=\"%e9%8c%af%e8%aa%a4%e4%bb%a3%e7%a2%bc-42712-%e7%9a%84%e6%88%90%e5%9b%a0-fYjfrMCyyS\">\u932f\u8aa4\u4ee3\u78bc 42712 \u7684\u6210\u56e0<\/h2>\n<p>PostgreSQL \u4e2d\u7684\u932f\u8aa4\u4ee3\u78bc 42712 \u901a\u5e38\u51fa\u73fe\u5728 SQL \u67e5\u8a62\u4e2d\uff0c\u7576\u4f60\u70ba\u540c\u4e00\u500b\u67e5\u8a62\u4e2d\u7684\u591a\u500b\u5217\u6216\u8868\u6307\u5b9a\u4e86\u76f8\u540c\u7684\u5225\u540d\u6642\uff0c\u5c31\u6703\u5f15\u767c\u6b64\u932f\u8aa4\u3002\u9019\u7a2e\u60c5\u6cc1\u901a\u5e38\u767c\u751f\u5728\u4f7f\u7528 <code>SELECT<\/code> \u8a9e\u53e5\u6642\uff0c\u5c24\u5176\u662f\u5728\u9032\u884c\u806f\u63a5\uff08JOIN\uff09\u64cd\u4f5c\u6216\u4f7f\u7528\u5b50\u67e5\u8a62\u6642\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b-fYjfrMCyyS\">\u793a\u4f8b<\/h3>\n<pre><code>SELECT \n    a.id AS user_id, \n    a.name AS user_name, \n    b.id AS user_id \nFROM \n    users a \nJOIN \n    orders b ON a.id = b.user_id;\n<\/code><\/pre>\n<p>\u5728\u4e0a\u8ff0\u67e5\u8a62\u4e2d\uff0c<code>user_id<\/code> \u5225\u540d\u88ab\u91cd\u8907\u4f7f\u7528\uff0c\u9019\u5c07\u5c0e\u81f4 PostgreSQL \u8fd4\u56de\u932f\u8aa4\u4ee3\u78bc 42712\u3002\u70ba\u4e86\u89e3\u6c7a\u9019\u500b\u554f\u984c\uff0c\u6211\u5011\u9700\u8981\u78ba\u4fdd\u6bcf\u500b\u5225\u540d\u90fd\u662f\u552f\u4e00\u7684\u3002<\/p>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9%e9%8c%af%e8%aa%a4%e4%bb%a3%e7%a2%bc-42712-fYjfrMCyyS\">\u5982\u4f55\u4fee\u5fa9\u932f\u8aa4\u4ee3\u78bc 42712<\/h2>\n<p>\u4fee\u5fa9\u6b64\u932f\u8aa4\u7684\u7b2c\u4e00\u6b65\u662f\u6aa2\u67e5 SQL \u67e5\u8a62\u4e2d\u6240\u6709\u7684\u5225\u540d\uff0c\u78ba\u4fdd\u5b83\u5011\u4e0d\u6703\u91cd\u8907\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4fee\u5fa9\u6b64\u932f\u8aa4\u7684\u5efa\u8b70\uff1a<\/p>\n<ul>\n<li><strong>\u6aa2\u67e5\u5225\u540d\uff1a<\/strong>\u4ed4\u7d30\u6aa2\u67e5\u67e5\u8a62\u4e2d\u7684\u6bcf\u500b\u5225\u540d\uff0c\u78ba\u4fdd\u5b83\u5011\u662f\u552f\u4e00\u7684\u3002<\/li>\n<li><strong>\u4f7f\u7528\u4e0d\u540c\u7684\u5225\u540d\uff1a<\/strong>\u5982\u679c\u767c\u73fe\u91cd\u8907\u7684\u5225\u540d\uff0c\u8acb\u70ba\u5176\u4e2d\u4e00\u500b\u6216\u591a\u500b\u5225\u540d\u66f4\u6539\u540d\u7a31\u3002<\/li>\n<li><strong>\u7c21\u5316\u67e5\u8a62\uff1a<\/strong>\u5982\u679c\u67e5\u8a62\u904e\u65bc\u8907\u96dc\uff0c\u8003\u616e\u5c07\u5176\u62c6\u5206\u70ba\u591a\u500b\u7c21\u55ae\u7684\u67e5\u8a62\uff0c\u9019\u6a23\u53ef\u4ee5\u66f4\u5bb9\u6613\u5730\u7ba1\u7406\u5225\u540d\u3002<\/li>\n<\/ul>\n<h3 id=\"%e4%bf%ae%e6%ad%a3%e7%a4%ba%e4%be%8b-fYjfrMCyyS\">\u4fee\u6b63\u793a\u4f8b<\/h3>\n<pre><code>SELECT \n    a.id AS user_id, \n    a.name AS user_name, \n    b.id AS order_id \nFROM \n    users a \nJOIN \n    orders b ON a.id = b.user_id;\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4fee\u6b63\u5f8c\u7684\u67e5\u8a62\u4e2d\uff0c\u6211\u5011\u5c07\u7b2c\u4e8c\u500b <code>user_id<\/code> \u5225\u540d\u66f4\u6539\u70ba <code>order_id<\/code>\uff0c\u9019\u6a23\u5c31\u907f\u514d\u4e86\u91cd\u8907\uff0c\u5f9e\u800c\u89e3\u6c7a\u4e86\u932f\u8aa4\u3002<\/p>\n<h2 id=\"%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-fYjfrMCyyS\">\u6700\u4f73\u5be6\u8e10<\/h2>\n<p>\u70ba\u4e86\u907f\u514d\u672a\u4f86\u518d\u6b21\u51fa\u73fe\u932f\u8aa4\u4ee3\u78bc 42712\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u9075\u5faa\u4ee5\u4e0b\u6700\u4f73\u5be6\u8e10\uff1a<\/p>\n<ul>\n<li><strong>\u4f7f\u7528\u6e05\u6670\u7684\u547d\u540d\u898f\u5247\uff1a<\/strong>\u70ba\u5225\u540d\u9078\u64c7\u5177\u6709\u63cf\u8ff0\u6027\u7684\u540d\u7a31\uff0c\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u91cd\u8907\u7684\u53ef\u80fd\u6027\u3002<\/li>\n<li><strong>\u5b9a\u671f\u5be9\u67e5\u67e5\u8a62\uff1a<\/strong>\u5728\u7de8\u5beb\u8907\u96dc\u67e5\u8a62\u6642\uff0c\u5b9a\u671f\u6aa2\u67e5\u5225\u540d\u7684\u4f7f\u7528\u60c5\u6cc1\u3002<\/li>\n<li><strong>\u4f7f\u7528 SQL \u7de8\u8f2f\u5668\u7684\u63d0\u793a\u529f\u80fd\uff1a<\/strong>\u8a31\u591a SQL \u7de8\u8f2f\u5668\u63d0\u4f9b\u4e86\u8a9e\u6cd5\u9ad8\u4eae\u548c\u932f\u8aa4\u63d0\u793a\u529f\u80fd\uff0c\u53ef\u4ee5\u5e6b\u52a9\u8b58\u5225\u6f5b\u5728\u7684\u554f\u984c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-fYjfrMCyyS\">\u7e3d\u7d50<\/h2>\n<p>PostgreSQL \u932f\u8aa4\u4ee3\u78bc 42712 &#8211; duplicate_alias \u662f\u4e00\u500b\u5e38\u898b\u7684\u554f\u984c\uff0c\u901a\u5e38\u7531\u65bc\u5728 SQL \u67e5\u8a62\u4e2d\u4f7f\u7528\u4e86\u91cd\u8907\u7684\u5225\u540d\u6240\u5f15\u8d77\u3002\u901a\u904e\u4ed4\u7d30\u6aa2\u67e5\u548c\u4fee\u6b63\u67e5\u8a62\u4e2d\u7684\u5225\u540d\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u8f15\u9b06\u89e3\u6c7a\u6b64\u554f\u984c\u3002\u9075\u5faa\u6700\u4f73\u5be6\u8e10\u53ef\u4ee5\u5e6b\u52a9\u907f\u514d\u672a\u4f86\u51fa\u73fe\u985e\u4f3c\u7684\u932f\u8aa4\u3002\u5982\u679c\u60a8\u9700\u8981\u9032\u4e00\u6b65\u7684\u652f\u6301\u6216\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc 42712 &#8211; duplicate_alias\uff0c\u907f\u514d\u91cd\u8907\u5225\u540d\u554f\u984c\uff0c\u78ba\u4fdd\u67e5\u8a62\u9806\u5229\u57f7\u884c\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-178998","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/178998","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=178998"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/178998\/revisions"}],"predecessor-version":[{"id":178999,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/178998\/revisions\/178999"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=178998"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=178998"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=178998"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}