{"id":177935,"date":"2024-11-08T16:48:05","date_gmt":"2024-11-08T08:48:05","guid":{"rendered":"https:\/\/server.hk\/cnblog\/177935\/"},"modified":"2024-11-08T16:48:06","modified_gmt":"2024-11-08T08:48:06","slug":"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9mysql%e9%8c%af%e8%aa%a41249-sqlstate-01000-er_select_reduced-%e9%81%b8%e6%93%87u%e5%9c%a8%e5%84%aa%e5%8c%96%e9%81%8e%e7%a8%8b%e4%b8%ad%e8%a2%ab%e7%b8%ae","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/177935\/","title":{"rendered":"\u5982\u4f55\u4fee\u5fa9MySQL\u932f\u8aa41249 &#8211; SQLSTATE: 01000 (ER_SELECT_REDUCED) \u9078\u64c7%u\u5728\u512a\u5316\u904e\u7a0b\u4e2d\u88ab\u7e2e\u6e1b"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9mysql%e9%8c%af%e8%aa%a41249-sqlstate-01000-er_select_reduced-%e9%81%b8%e6%93%87u%e5%9c%a8%e5%84%aa%e5%8c%96%e9%81%8e%e7%a8%8b%e4%b8%ad%e8%a2%ab%e7%b8%ae-EBkmywJUrh\">\u5982\u4f55\u4fee\u5fa9MySQL\u932f\u8aa41249 &#8211; SQLSTATE: 01000 (ER_SELECT_REDUCED) \u9078\u64c7%u\u5728\u512a\u5316\u904e\u7a0b\u4e2d\u88ab\u7e2e\u6e1b<\/h1>\n<p>\u5728\u4f7f\u7528MySQL\u6578\u64da\u5eab\u6642\uff0c\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u53ef\u80fd\u6703\u9047\u5230\u5404\u7a2e\u932f\u8aa4\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f\u932f\u8aa41249\uff0c\u8a72\u932f\u8aa4\u7684SQLSTATE\u4ee3\u78bc\u70ba01000\u3002\u9019\u500b\u932f\u8aa4\u901a\u5e38\u51fa\u73fe\u5728\u57f7\u884c\u67e5\u8a62\u6642\uff0c\u7279\u5225\u662f\u5728\u512a\u5316\u904e\u7a0b\u4e2d\uff0c\u7576MySQL\u6c7a\u5b9a\u7e2e\u6e1b\u9078\u64c7\u7684\u5217\u6578\u6642\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u500b\u932f\u8aa4\u7684\u539f\u56e0\u3001\u5f71\u97ff\u4ee5\u53ca\u5982\u4f55\u6709\u6548\u5730\u4fee\u5fa9\u5b83\u3002<\/p>\n<h2 id=\"%e9%8c%af%e8%aa%a41249%e7%9a%84%e5%8e%9f%e5%9b%a0-EBkmywJUrh\">\u932f\u8aa41249\u7684\u539f\u56e0<\/h2>\n<p>\u932f\u8aa41249\u7684\u4e3b\u8981\u539f\u56e0\u662fMySQL\u5728\u57f7\u884c\u67e5\u8a62\u6642\uff0c\u6839\u64da\u67e5\u8a62\u7684\u4e0a\u4e0b\u6587\u548c\u512a\u5316\u5668\u7684\u6c7a\u7b56\uff0c\u9078\u64c7\u4e86\u7e2e\u6e1b\u7684\u5217\u3002\u9019\u901a\u5e38\u767c\u751f\u5728\u4ee5\u4e0b\u60c5\u6cc1\uff1a<\/p>\n<ul>\n<li><strong>\u4f7f\u7528\u4e86GROUP BY\u6216DISTINCT\uff1a<\/strong>\u7576\u67e5\u8a62\u4e2d\u4f7f\u7528\u4e86GROUP BY\u6216DISTINCT\u6642\uff0cMySQL\u53ef\u80fd\u6703\u81ea\u52d5\u7e2e\u6e1b\u9078\u64c7\u7684\u5217\uff0c\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/li>\n<li><strong>\u5b50\u67e5\u8a62\u7684\u4f7f\u7528\uff1a<\/strong>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u5b50\u67e5\u8a62\u7684\u7d50\u679c\u53ef\u80fd\u6703\u5c0e\u81f4MySQL\u9078\u64c7\u4e0d\u5fc5\u8981\u7684\u5217\uff0c\u5f9e\u800c\u5f15\u767c\u6b64\u932f\u8aa4\u3002<\/li>\n<li><strong>\u4e0d\u6b63\u78ba\u7684JOIN\u64cd\u4f5c\uff1a<\/strong>\u5982\u679c\u5728JOIN\u64cd\u4f5c\u4e2d\u4f7f\u7528\u4e86\u4e0d\u6b63\u78ba\u7684\u689d\u4ef6\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4MySQL\u7121\u6cd5\u6b63\u78ba\u89e3\u6790\u67e5\u8a62\uff0c\u5f9e\u800c\u7e2e\u6e1b\u9078\u64c7\u7684\u5217\u3002<\/li>\n<\/ul>\n<h2 id=\"%e9%8c%af%e8%aa%a4%e7%9a%84%e5%bd%b1%e9%9f%bf-EBkmywJUrh\">\u932f\u8aa4\u7684\u5f71\u97ff<\/h2>\n<p>\u7576\u51fa\u73fe\u932f\u8aa41249\u6642\uff0c\u67e5\u8a62\u5c07\u7121\u6cd5\u6b63\u78ba\u57f7\u884c\uff0c\u9019\u53ef\u80fd\u6703\u5c0e\u81f4\u6578\u64da\u4e1f\u5931\u6216\u4e0d\u4e00\u81f4\u7684\u7d50\u679c\u3002\u5c0d\u65bc\u4f9d\u8cf4\u65bc\u9019\u4e9b\u67e5\u8a62\u7684\u61c9\u7528\u7a0b\u5e8f\u4f86\u8aaa\uff0c\u9019\u53ef\u80fd\u6703\u9020\u6210\u56b4\u91cd\u7684\u5f71\u97ff\uff0c\u7279\u5225\u662f\u5728\u6578\u64da\u5eab\u64cd\u4f5c\u983b\u7e41\u7684\u60c5\u6cc1\u4e0b\u3002<\/p>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9%e9%8c%af%e8%aa%a41249-EBkmywJUrh\">\u5982\u4f55\u4fee\u5fa9\u932f\u8aa41249<\/h2>\n<p>\u4fee\u5fa9MySQL\u932f\u8aa41249\u7684\u904e\u7a0b\u901a\u5e38\u6d89\u53ca\u4ee5\u4e0b\u5e7e\u500b\u6b65\u9a5f\uff1a<\/p>\n<h3 id=\"1-%e6%aa%a2%e6%9f%a5%e6%9f%a5%e8%a9%a2%e8%aa%9e%e5%8f%a5-EBkmywJUrh\">1. \u6aa2\u67e5\u67e5\u8a62\u8a9e\u53e5<\/h3>\n<p>\u9996\u5148\uff0c\u4ed4\u7d30\u6aa2\u67e5\u5c0e\u81f4\u932f\u8aa4\u7684\u67e5\u8a62\u8a9e\u53e5\u3002\u78ba\u4fdd\u6240\u6709\u7684\u5217\u90fd\u6b63\u78ba\u5730\u5217\u51fa\uff0c\u4e26\u4e14\u6c92\u6709\u591a\u9918\u7684\u5217\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT column1, column2 FROM table_name WHERE condition;<\/code><\/pre>\n<p>\u5982\u679c\u4f7f\u7528\u4e86GROUP BY\u6216DISTINCT\uff0c\u8acb\u78ba\u4fdd\u9019\u4e9b\u64cd\u4f5c\u662f\u5fc5\u8981\u7684\uff0c\u4e26\u4e14\u6240\u6709\u7684\u5217\u90fd\u6b63\u78ba\u5730\u5305\u542b\u5728\u67e5\u8a62\u4e2d\u3002<\/p>\n<h3 id=\"2-%e5%84%aa%e5%8c%96join%e6%93%8d%e4%bd%9c-EBkmywJUrh\">2. \u512a\u5316JOIN\u64cd\u4f5c<\/h3>\n<p>\u5982\u679c\u67e5\u8a62\u4e2d\u5305\u542bJOIN\u64cd\u4f5c\uff0c\u8acb\u6aa2\u67e5JOIN\u689d\u4ef6\u662f\u5426\u6b63\u78ba\u3002\u78ba\u4fdd\u6240\u6709\u7684\u8868\u90fd\u6b63\u78ba\u5730\u9023\u63a5\uff0c\u4e26\u4e14\u6c92\u6709\u907a\u6f0f\u5fc5\u8981\u7684\u689d\u4ef6\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u6b63\u78ba\u7684JOIN\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT a.column1, b.column2 FROM table_a a JOIN table_b b ON a.id = b.a_id;<\/code><\/pre>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8explain%e5%88%86%e6%9e%90%e6%9f%a5%e8%a9%a2-EBkmywJUrh\">3. \u4f7f\u7528EXPLAIN\u5206\u6790\u67e5\u8a62<\/h3>\n<p>\u4f7f\u7528EXPLAIN\u8a9e\u53e5\u4f86\u5206\u6790\u67e5\u8a62\u7684\u57f7\u884c\u8a08\u5283\uff0c\u9019\u53ef\u4ee5\u5e6b\u52a9\u4f60\u4e86\u89e3MySQL\u662f\u5982\u4f55\u8655\u7406\u67e5\u8a62\u7684\u3002\u9019\u6a23\u53ef\u4ee5\u627e\u51fa\u53ef\u80fd\u5c0e\u81f4\u932f\u8aa4\u7684\u90e8\u5206\u3002<\/p>\n<pre><code>EXPLAIN SELECT column1, column2 FROM table_name WHERE condition;<\/code><\/pre>\n<h3 id=\"4-%e6%b8%ac%e8%a9%a6%e5%92%8c%e9%a9%97%e8%ad%89-EBkmywJUrh\">4. \u6e2c\u8a66\u548c\u9a57\u8b49<\/h3>\n<p>\u5728\u9032\u884c\u4e86\u4e0a\u8ff0\u4fee\u6539\u5f8c\uff0c\u91cd\u65b0\u57f7\u884c\u67e5\u8a62\u4ee5\u6aa2\u67e5\u932f\u8aa4\u662f\u5426\u5df2\u7d93\u4fee\u5fa9\u3002\u78ba\u4fdd\u67e5\u8a62\u8fd4\u56de\u7684\u7d50\u679c\u662f\u6b63\u78ba\u7684\uff0c\u4e26\u4e14\u6c92\u6709\u51fa\u73fe\u65b0\u7684\u932f\u8aa4\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-EBkmywJUrh\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u932f\u8aa41249\uff08SQLSTATE: 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