MYSQL提示錯誤代碼：1248 Every derived table must have its own alias

本文轉載自查看原文 2016-07-28 18:22 5877 MYSQL

MYSQL中執行如下嵌套子查詢時報錯

SELECT COUNT(c) FROM (SELECT c,COUNT(s) AS scount FROM sc GROUP BY c) WHERE scount>1

報錯如下：

　　錯誤代碼： 1248
　　Every derived table must have its own alias

意思是派生出來的表需要有自己的別名。

解決方法：將子查詢派生的表賦予別名即可

SELECT COUNT(c) FROM (SELECT c,COUNT(s) AS scount FROM sc GROUP BY c)AS temp WHERE scount>1

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