SQL查询,计数和分组

+---+----+
|Key|Name|
+---+----+
|1  |Dan |
+---+----+
|2  |Tom |
+---+----+
|3  |Jon |
+---+----+
|4  |Tom |
+---+----+
|5  |Sam |
+---+----+
|6  |Dan |
+---+----+

什么是SQL查询带回的名称重复2次以上的记录？

所以我想要的结果是

+---+
 |Tom|
 +---+
 |Dan|
 +---+

解决方法

Select
Name,Count(Name) As Count
From
Table
Group By
Name
Having
Count(Name) > 1
Order By
Count(Name) Desc

这也可以扩展到删除重复项：

Delete
From
Table
Where
Key In (
    Select
    Max(Key)
    From
    Table
    Group By
    Name
    Having
Count(Name) > 1)

（编辑：李大同）

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