Oracle “column ambiguously defined ” 错误

在Oracle中执行查询，有时候会报错“column ambiguously defined ”，中文意思是字段定义模糊。报错如下图：

这个错误通常是由于FROM的两个表中都有某个字段，例如：

SELECT aFROM table1,table2WHERE 1=1

若table1和table2两个表中都有a字段，就会发生此类错误。

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Oracle “column ambiguously defined ” 错误

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