Question

愚蠢的问题和答案可能不存在（Gasp！呻吟！Gnash！牙齿！）

我有一个选择：

SELECT * FROM SockDrawer WHERE Color = 'red'

这导致3行，行ID为33896,35901,37903 （还有很多其他结果。）

我想要的是这样的：

DECLARE @ROWID INT --- HOW DO I USE ARRAYS? I'll google but an example would help.
DECLARE @COUNT INT
DECLARE @LIMIT INT

SELECT * FROM SockDrawer WHERE Color = 'red' 
--(Returns 3 rows. With 3 RowId's 33896, 35901, 33896)

SET @LIMIT = @@ROWCOUNT

SET @COUNT = 1
WHILE @COUNT < @LIMIT BEGIN
  SET @ROWID[0] = (SELECT SockKey From SockDrawer WHERE RowID = 33896)
  SET @ROWID[1] = (SELECT SockKey From SockDrawer WHERE RowID = 35901)
  SET @ROWID[2] = (SELECT SockKey From SockDrawer WHERE RowID = 33896)
  SET @Count = @Count + 1
 END
GO

Then I need to:


SET @COUNT = 0
WHILE @COUNT < @LIMIT 
    BEGIN
        DELETE FROM SockDrawer WHERE RowID = @ROWID[@COUNT]
    END
GO

诀窍是我永远不会知道我是否要处理1行删除或50。

我是个笨蛋。我可以改变。如果我想。

Answer 1

如果您不关心每种颜色的袜子，那么：

;WITH x AS 
(
  SELECT *, rn = ROW_NUMBER() OVER (PARTITION BY Color ORDER BY RowID)
    FROM dbo.SockDrawer
)
DELETE x WHERE rn > 1;

如果您关心自己保留哪一个，请相应地调整ORDER BY。

从TableWithNRows中选择TOP 1,2,3 RowId

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