{"id":177919,"date":"2024-11-08T16:39:27","date_gmt":"2024-11-08T08:39:27","guid":{"rendered":"https:\/\/server.hk\/cnblog\/177919\/"},"modified":"2024-11-08T16:39:29","modified_gmt":"2024-11-08T08:39:29","slug":"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9mysql%e9%8c%af%e8%aa%a41241-sqlstate-21000-er_operand_columns-%e6%93%8d%e4%bd%9c%e6%95%b8%e6%87%89%e5%8c%85%e5%90%abd%e5%88%97","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/177919\/","title":{"rendered":"\u5982\u4f55\u4fee\u5fa9MySQL\u932f\u8aa41241 &#8211; SQLSTATE: 21000 (ER_OPERAND_COLUMNS) \u64cd\u4f5c\u6578\u61c9\u5305\u542b%d\u5217"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9mysql%e9%8c%af%e8%aa%a41241-sqlstate-21000-er_operand_columns-%e6%93%8d%e4%bd%9c%e6%95%b8%e6%87%89%e5%8c%85%e5%90%abd%e5%88%97-fdnScdvNWX\">\u5982\u4f55\u4fee\u5fa9MySQL\u932f\u8aa41241 &#8211; SQLSTATE: 21000 (ER_OPERAND_COLUMNS) \u64cd\u4f5c\u6578\u61c9\u5305\u542b%d\u5217<\/h1>\n<p>\u5728\u4f7f\u7528MySQL\u6578\u64da\u5eab\u6642\uff0c\u958b\u767c\u8005\u53ef\u80fd\u6703\u9047\u5230\u5404\u7a2e\u932f\u8aa4\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f\u932f\u8aa41241\uff0c\u8a72\u932f\u8aa4\u7684SQLSTATE\u4ee3\u78bc\u70ba21000\uff0c\u8868\u793a\u64cd\u4f5c\u6578\u61c9\u5305\u542b\u7279\u5b9a\u7684\u5217\u6578\u3002\u9019\u500b\u932f\u8aa4\u901a\u5e38\u767c\u751f\u5728\u57f7\u884c\u6d89\u53ca\u591a\u500b\u5217\u7684\u67e5\u8a62\u6642\uff0c\u7279\u5225\u662f\u5728\u4f7f\u7528\u805a\u5408\u51fd\u6578\u6216\u5b50\u67e5\u8a62\u7684\u60c5\u6cc1\u4e0b\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u8a72\u932f\u8aa4\u7684\u6210\u56e0\u53ca\u5176\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n<h2 id=\"%e9%8c%af%e8%aa%a41241%e7%9a%84%e6%88%90%e5%9b%a0-fdnScdvNWX\">\u932f\u8aa41241\u7684\u6210\u56e0<\/h2>\n<p>\u932f\u8aa41241\u901a\u5e38\u51fa\u73fe\u5728\u4ee5\u4e0b\u5e7e\u7a2e\u60c5\u6cc1\u4e2d\uff1a<\/p>\n<ul>\n<li><strong>\u4e0d\u5339\u914d\u7684\u5217\u6578\uff1a<\/strong>\u7576\u4f60\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528\u4e86\u4e0d\u5339\u914d\u7684\u5217\u6578\u6642\uff0c\u4f8b\u5982\u5728SELECT\u8a9e\u53e5\u4e2d\u9078\u64c7\u7684\u5217\u6578\u8207GROUP BY\u6216HAVING\u5b50\u53e5\u4e2d\u7684\u5217\u6578\u4e0d\u4e00\u81f4\u3002<\/li>\n<li><strong>\u5b50\u67e5\u8a62\u8fd4\u56de\u591a\u5217\uff1a<\/strong>\u5982\u679c\u5b50\u67e5\u8a62\u8fd4\u56de\u591a\u65bc\u4e00\u5217\uff0c\u800c\u4e3b\u67e5\u8a62\u671f\u671b\u7684\u537b\u662f\u55ae\u5217\uff0c\u5247\u6703\u5f15\u767c\u6b64\u932f\u8aa4\u3002<\/li>\n<li><strong>\u4f7f\u7528\u4e0d\u7576\u7684\u805a\u5408\u51fd\u6578\uff1a<\/strong>\u5728\u4f7f\u7528\u805a\u5408\u51fd\u6578\u6642\uff0c\u82e5\u672a\u6b63\u78ba\u6307\u5b9aGROUP BY\u5b50\u53e5\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u6b64\u932f\u8aa4\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%a4%ba%e4%be%8b%e5%88%86%e6%9e%90-fdnScdvNWX\">\u793a\u4f8b\u5206\u6790<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u53ef\u80fd\u5c0e\u81f4\u932f\u8aa41241\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT department, COUNT(*)\nFROM employees\nWHERE salary &gt; (SELECT salary FROM employees WHERE department = 'Sales')\nGROUP BY department;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c\u5b50\u67e5\u8a62\u8fd4\u56de\u4e86\u591a\u500b\u85aa\u6c34\u503c\uff0c\u800c\u4e3b\u67e5\u8a62\u671f\u671b\u7684\u662f\u55ae\u4e00\u503c\u3002\u9019\u6a23\u7684\u60c5\u6cc1\u6703\u5c0e\u81f4\u932f\u8aa41241\u7684\u767c\u751f\u3002<\/p>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9%e9%8c%af%e8%aa%a41241-fdnScdvNWX\">\u5982\u4f55\u4fee\u5fa9\u932f\u8aa41241<\/h2>\n<p>\u8981\u4fee\u5fa9\u932f\u8aa41241\uff0c\u53ef\u4ee5\u63a1\u53d6\u4ee5\u4e0b\u5e7e\u500b\u6b65\u9a5f\uff1a<\/p>\n<h3 id=\"1-%e7%a2%ba%e8%aa%8d%e5%88%97%e6%95%b8%e5%8c%b9%e9%85%8d-fdnScdvNWX\">1. \u78ba\u8a8d\u5217\u6578\u5339\u914d<\/h3>\n<p>\u6aa2\u67e5\u4f60\u7684\u67e5\u8a62\uff0c\u78ba\u4fdd\u6240\u6709\u6d89\u53ca\u7684\u5217\u6578\u662f\u5339\u914d\u7684\u3002\u4f8b\u5982\uff0c\u5728GROUP BY\u5b50\u53e5\u4e2d\u5217\u51fa\u7684\u6240\u6709\u5217\u90fd\u61c9\u8a72\u5728SELECT\u8a9e\u53e5\u4e2d\u51fa\u73fe\uff0c\u6216\u8005\u5728\u805a\u5408\u51fd\u6578\u4e2d\u9032\u884c\u8655\u7406\u3002<\/p>\n<h3 id=\"2-%e4%bf%ae%e6%94%b9%e5%ad%90%e6%9f%a5%e8%a9%a2-fdnScdvNWX\">2. \u4fee\u6539\u5b50\u67e5\u8a62<\/h3>\n<p>\u5982\u679c\u5b50\u67e5\u8a62\u8fd4\u56de\u591a\u5217\uff0c\u5247\u9700\u8981\u4fee\u6539\u5b83\u4ee5\u78ba\u4fdd\u53ea\u8fd4\u56de\u4e00\u5217\u3002\u53ef\u4ee5\u4f7f\u7528\u805a\u5408\u51fd\u6578\u4f86\u9054\u5230\u9019\u4e00\u76ee\u7684\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT department, COUNT(*)\nFROM employees\nWHERE salary &gt; (SELECT MAX(salary) FROM employees WHERE department = 'Sales')\nGROUP BY department;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u5b50\u67e5\u8a62\u4f7f\u7528\u4e86MAX\u51fd\u6578\uff0c\u78ba\u4fdd\u53ea\u8fd4\u56de\u4e00\u500b\u503c\uff0c\u5f9e\u800c\u907f\u514d\u4e86\u932f\u8aa41241\u3002<\/p>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8join%e6%9b%bf%e4%bb%a3%e5%ad%90%e6%9f%a5%e8%a9%a2-fdnScdvNWX\">3. \u4f7f\u7528JOIN\u66ff\u4ee3\u5b50\u67e5\u8a62<\/h3>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528JOIN\u8a9e\u53e5\u53ef\u4ee5\u66f4\u6e05\u6670\u5730\u8868\u9054\u67e5\u8a62\u908f\u8f2f\uff0c\u4e26\u907f\u514d\u932f\u8aa4\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT e.department, COUNT(*)\nFROM employees e\nJOIN (SELECT MAX(salary) AS max_salary FROM employees WHERE department = 'Sales') s\nON e.salary &gt; s.max_salary\nGROUP BY e.department;<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u5beb\u6cd5\u4e0d\u50c5\u907f\u514d\u4e86\u932f\u8aa4\uff0c\u9084\u63d0\u9ad8\u4e86\u67e5\u8a62\u7684\u53ef\u8b80\u6027\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-fdnScdvNWX\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u932f\u8aa41241 &#8211; SQLSTATE: 21000 (ER_OPERAND_COLUMNS) \u662f\u4e00\u500b\u5e38\u898b\u7684\u932f\u8aa4\uff0c\u901a\u5e38\u7531\u65bc\u67e5\u8a62\u4e2d\u5217\u6578\u4e0d\u5339\u914d\u6216\u5b50\u67e5\u8a62\u8fd4\u56de\u591a\u5217\u6240\u5f15\u8d77\u3002\u901a\u904e\u4ed4\u7d30\u6aa2\u67e5\u67e5\u8a62\u7d50\u69cb\u3001\u78ba\u4fdd\u5217\u6578\u5339\u914d\u4ee5\u53ca\u9069\u7576\u4f7f\u7528\u805a\u5408\u51fd\u6578\u6216JOIN\u8a9e\u53e5\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u4fee\u5fa9\u6b64\u932f\u8aa4\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> \u662f\u81f3\u95dc\u91cd\u8981\u7684\uff0c\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u53ef\u9760\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4fee\u5fa9MySQL\u932f\u8aa41241 (SQLSTATE: 21000) \u7684\u65b9\u6cd5\uff0c\u89e3\u6c7a\u64cd\u4f5c\u6578\u5217\u6578\u4e0d\u5339\u914d\u554f\u984c\uff0c\u78ba\u4fdd\u67e5\u8a62\u6b63\u78ba\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-177919","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/177919","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=177919"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/177919\/revisions"}],"predecessor-version":[{"id":177920,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/177919\/revisions\/177920"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=177919"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=177919"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=177919"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}