不明确的列名：Sqlite中的DELETE

Question

这是我的查询。

DELETE 
FROM CategoryProduct_MM
WHERE PrdID IN 
(SELECT PrdID FROM CategoryProduct_MM t1
INNER JOIN db2.CategoryProduct_MM t2 
ON (t1.PrdID = t2.PrdID AND t1.CategoryID=t2.CategoryID));

为什么我收到此错误？

ambiguous column name: PrdID: DELETE 

Answer 1

DELETE 
FROM CategoryProduct_MM
WHERE PrdID IN 
(SELECT t1.PrdID FROM CategoryProduct_MM t1
INNER JOIN db2.CategoryProduct_MM t2 
ON (t1.PrdID = t2.PrdID AND t1.CategoryID=t2.CategoryID));