{"id":179004,"date":"2024-11-08T22:12:17","date_gmt":"2024-11-08T14:12:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/179004\/"},"modified":"2024-11-08T22:12:18","modified_gmt":"2024-11-08T14:12:18","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%9a42803-grouping_error%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/179004\/","title":{"rendered":"\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a42803 &#8211; grouping_error\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%9a42803-grouping_error-tekfHrfMzY\">\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a42803 &#8211; grouping_error<\/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 42803\uff0c\u901a\u5e38\u88ab\u7a31\u70ba <strong>grouping_error<\/strong>\u3002\u9019\u500b\u932f\u8aa4\u901a\u5e38\u767c\u751f\u5728\u4f7f\u7528\u805a\u5408\u51fd\u6578\u548c GROUP BY \u5b50\u53e5\u6642\uff0c\u7576\u67e5\u8a62\u4e2d\u7684\u67d0\u4e9b\u5217\u672a\u6b63\u78ba\u5206\u7d44\u6642\uff0c\u6703\u5c0e\u81f4\u6b64\u932f\u8aa4\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u500b\u932f\u8aa4\u7684\u539f\u56e0\u53ca\u5176\u4fee\u5fa9\u65b9\u6cd5\u3002<\/p>\n<h2 id=\"%e9%8c%af%e8%aa%a4%e4%bb%a3%e7%a2%bc-42803-%e7%9a%84%e5%8e%9f%e5%9b%a0-tekfHrfMzY\">\u932f\u8aa4\u4ee3\u78bc 42803 \u7684\u539f\u56e0<\/h2>\n<p>PostgreSQL \u7684\u932f\u8aa4\u4ee3\u78bc 42803 \u901a\u5e38\u8868\u793a\u5728 SQL \u67e5\u8a62\u4e2d\u5b58\u5728\u5206\u7d44\u554f\u984c\u3002\u5177\u9ad4\u4f86\u8aaa\uff0c\u7576\u4f60\u5728 SELECT \u8a9e\u53e5\u4e2d\u4f7f\u7528\u4e86\u805a\u5408\u51fd\u6578\uff08\u5982 COUNT\u3001SUM\u3001AVG \u7b49\uff09\uff0c\u4f46\u5728 GROUP BY \u5b50\u53e5\u4e2d\u672a\u5305\u542b\u6240\u6709\u975e\u805a\u5408\u5217\u6642\uff0c\u5c31\u6703\u51fa\u73fe\u6b64\u932f\u8aa4\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u8003\u616e\u4ee5\u4e0b SQL \u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT department, COUNT(employee_id) \nFROM employees \nWHERE salary &gt; 50000;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c\u6211\u5011\u8a66\u5716\u8a08\u7b97\u6bcf\u500b\u90e8\u9580\u4e2d\u85aa\u6c34\u9ad8\u65bc 50000 \u7684\u54e1\u5de5\u6578\u91cf\uff0c\u4f46\u6c92\u6709\u4f7f\u7528 GROUP BY \u5b50\u53e5\u3002\u9019\u5c07\u5c0e\u81f4\u932f\u8aa4 42803\uff0c\u56e0\u70ba PostgreSQL \u7121\u6cd5\u78ba\u5b9a\u5982\u4f55\u5c0d department \u5217\u9032\u884c\u5206\u7d44\u3002<\/p>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9-grouping_error-tekfHrfMzY\">\u5982\u4f55\u4fee\u5fa9 grouping_error<\/h2>\n<p>\u8981\u4fee\u5fa9\u9019\u500b\u932f\u8aa4\uff0c\u60a8\u9700\u8981\u78ba\u4fdd\u5728 SELECT \u8a9e\u53e5\u4e2d\u4f7f\u7528\u7684\u6240\u6709\u975e\u805a\u5408\u5217\u90fd\u5305\u542b\u5728 GROUP BY \u5b50\u53e5\u4e2d\u3002\u4ee5\u4e0b\u662f\u4fee\u6b63\u5f8c\u7684\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT department, COUNT(employee_id) \nFROM employees \nWHERE salary &gt; 50000 \nGROUP BY department;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4fee\u6b63\u7684\u67e5\u8a62\u4e2d\uff0c\u6211\u5011\u6dfb\u52a0\u4e86 GROUP BY department\uff0c\u9019\u6a23 PostgreSQL \u5c31\u80fd\u6b63\u78ba\u5730\u5c0d\u6bcf\u500b\u90e8\u9580\u9032\u884c\u5206\u7d44\uff0c\u4e26\u8a08\u7b97\u6bcf\u500b\u90e8\u9580\u4e2d\u7b26\u5408\u689d\u4ef6\u7684\u54e1\u5de5\u6578\u91cf\u3002<\/p>\n<h2 id=\"%e5%85%b6%e4%bb%96%e5%b8%b8%e8%a6%8b%e7%9a%84-grouping_error-%e6%83%85%e6%b3%81-tekfHrfMzY\">\u5176\u4ed6\u5e38\u898b\u7684 grouping_error \u60c5\u6cc1<\/h2>\n<ul>\n<li><strong>\u4f7f\u7528\u591a\u500b\u805a\u5408\u51fd\u6578\uff1a<\/strong>\u5982\u679c\u5728\u540c\u4e00\u67e5\u8a62\u4e2d\u4f7f\u7528\u591a\u500b\u805a\u5408\u51fd\u6578\uff0c\u78ba\u4fdd\u6240\u6709\u975e\u805a\u5408\u5217\u90fd\u5728 GROUP BY \u5b50\u53e5\u4e2d\u3002\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<pre><code>SELECT department, AVG(salary), COUNT(employee_id) \nFROM employees \nGROUP BY department;<\/code><\/pre>\n<ul>\n<li><strong>\u5b50\u67e5\u8a62\u4e2d\u7684\u5206\u7d44\uff1a<\/strong>\u5982\u679c\u60a8\u5728\u5b50\u67e5\u8a62\u4e2d\u4f7f\u7528\u4e86\u805a\u5408\u51fd\u6578\uff0c\u8acb\u78ba\u4fdd\u5916\u90e8\u67e5\u8a62\u4e5f\u6b63\u78ba\u8655\u7406\u5206\u7d44\u3002\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<pre><code>SELECT department, total_salary \nFROM (SELECT department, SUM(salary) AS total_salary \n      FROM employees \n      GROUP BY department) AS dept_salaries;<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-tekfHrfMzY\">\u7e3d\u7d50<\/h2>\n<p>PostgreSQL \u932f\u8aa4\u4ee3\u78bc 42803 &#8211; grouping_error \u901a\u5e38\u662f\u7531\u65bc\u5728\u4f7f\u7528\u805a\u5408\u51fd\u6578\u6642\u672a\u6b63\u78ba\u8655\u7406 GROUP BY \u5b50\u53e5\u6240\u5f15\u8d77\u7684\u3002\u901a\u904e\u78ba\u4fdd\u6240\u6709\u975e\u805a\u5408\u5217\u90fd\u5305\u542b\u5728 GROUP BY \u5b50\u53e5\u4e2d\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u4fee\u5fa9\u6b64\u932f\u8aa4\u3002\u4e86\u89e3\u9019\u4e9b\u57fa\u672c\u539f\u5247\u5c07\u6709\u52a9\u65bc\u958b\u767c\u8005\u5728\u4f7f\u7528 PostgreSQL \u6642\u907f\u514d\u5e38\u898b\u7684\u932f\u8aa4\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2f VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u7528\u6236\u3002\u7121\u8ad6\u662f\u5c0f\u578b\u4f01\u696d\u9084\u662f\u5927\u578b\u4f01\u696d\uff0c\u6211\u5011\u7684 <a href=\"https:\/\/server.hk\">\u4e91\u4f3a\u670d\u5668<\/a> \u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u6027\u80fd\u548c\u53ef\u9760\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc 42803 &#8211; grouping_error\uff0c\u89e3\u6c7a\u67e5\u8a62\u4e2d\u7684\u5206\u7d44\u554f\u984c\uff0c\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\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-179004","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179004","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=179004"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179004\/revisions"}],"predecessor-version":[{"id":179005,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179004\/revisions\/179005"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=179004"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=179004"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=179004"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}