题
如果我有这样的数据:
+---+----+
|Key|Name|
+---+----+
|1 |Dan |
+---+----+
|2 |Tom |
+---+----+
|3 |Jon |
+---+----+
|4 |Tom |
+---+----+
|5 |Sam |
+---+----+
|6 |Dan |
+---+----+
什么是SQL query带回来的记录 Name
重复2个或更多次?
因此结果,我希望是
+---+
|Tom|
+---+
|Dan|
+---+
解决方案
不能简单...
Select
Name,
Count(Name) As Count
From
Table
Group By
Name
Having
Count(Name) > 1
Order By
Count(Name) Desc
这也可以扩展,以删除重复:
Delete
From
Table
Where
Key In (
Select
Max(Key)
From
Table
Group By
Name
Having
Count(Name) > 1)
其他提示
select name from table group by name having count(name) > 1
这也可以通过加入该表本身,
SELECT DISTINCT t1.name
FROM tbl t1
INNER JOIN tbl t2
ON t1.name = t2.name
WHERE t1.key != t2.key;
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