column ambiguously defined

今天碰到的问题：

nested exception is java.sql.SQLException: ORA-00918: column ambiguously defined

查到如下资料：

出错原因：
SELECT 1 AS cc ,2 AS cc FROM dual;这个语句是没错的。
而下面这个就有问题了：
SELECT * FROM ( SELECT 1 AS cc ,2 AS cc FROM dual );

所以出现这种错误，就找找是不是有字段的别名定义重复了。

问题解决！

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