在sqlite中查找重复的列值 [英] Find duplicate column value in sqlite

问题描述

我在表 DataTab 中插入了一些值。

I have inserted some values in the table DataTab.

SomeId: Integer     => Autogenerated primary key.
DataId: Guid
DataNumber: Integer
DataType: varchar

如果表包含重复的 DataId 值，以上就是我表中的列。
我已经使用数据库很长时间了。现在，我可以找出简单的查询了。但是我发现这有些困难。

The above are the column's in my tables, I want to find, if the table contains Repeated DataId values. It has been long time I had worked with databases. Now I can figure out simple queries. But I found this some what difficult.

我尝试了以下查询，这正确吗？

I tried the following query, is this correct?

SELECT * from (Select * from DataTab) AS X 
where DataId= X.DataId AND SomeId!=X.SomeId

推荐答案

SELECT DataId, COUNT(*) c FROM DataTab GROUP BY DataId HAVING c > 1;

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