SQLクエリ、カウントおよびグループ化

original title: "SQL query, count and group by"

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If I have data like this:

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

What is the SQL query to bring back the records where Name is repeated 2 or more times?

So the result I would want is

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

ソース

次のようなデータがある場合：+ --- + ---- + | Key | Name | + --- + ---- + | 1 |ダン| + --- + ---- + | 2 |トム| + --- + ---- + | 3 |ジョン| + --- + ---- + | 4 |トム| + --- + ---- + | 5 |サム| + --- + ---- + | 6 |ダン| + --- + ---- + Wh ...

これは翻訳後の要約です。完全な翻訳を表示する必要がある場合は、「翻訳」アイコンをクリックしてください。

すべての答え

GateKiller #1

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Couldn't be simpler...

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

This could also be extended to delete duplicates:

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

Ryan #2

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select name from table group by name having count(name) > 1

Dag Haavi Finstad #3

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This could also be accomplished by joining the table with itself,

SELECT DISTINCT t1.name
FROM    tbl t1
        INNER JOIN tbl t2
        ON      t1.name = t2.name
WHERE   t1.key         != t2.key;

SQLクエリ、カウントおよびグループ化

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