如何使这个跳过重复?TSQL分割功能跳过重复
该柱可以是 一个;二;三;二
想上的分裂; while循环中插入前要跳过所述第二两(任何重复)
CREATE FUNCTION dbo.Split2
(
@RowData varchar(max),
@SplitOn varchar(5)
)
RETURNS @RtnValue table
(
Id int identity(1,1),
Data varchar(8000)
)
AS
BEGIN
Declare @Cnt int
Set @Cnt = 1
While (Charindex(@SplitOn,@RowData)>0)
Begin
Insert Into @RtnValue (data)
Select
Data = ltrim(rtrim(Substring(@RowData,1,Charindex(@SplitOn,@RowData)-1)))
Set @RowData = Substring(@RowData,Charindex(@SplitOn,@RowData)+1,len(@RowData))
Set @Cnt = @Cnt + 1
End
Insert Into @RtnValue (data)
Select Data = ltrim(rtrim(@RowData))
Return
END
回答
CREATE FUNCTION dbo.Split2
(
@RowData varchar(max),
@SplitOn varchar(5)
)
RETURNS @RtnValue table
(
Id int identity(1,1),
Data varchar(8000)
)
AS
BEGIN
Declare @Data varchar(8000)
Declare @Cnt int
Set @Cnt = 1
While (Charindex(@SplitOn,@RowData)>0)
Begin
set @Data = ltrim(rtrim(Substring(@RowData,1,Charindex(@SplitOn,@RowData)-1)))
IF NOT EXISTS (SELECT * FROM @RtnValue WHERE data = @Data)
BEGIN
INSERT INTO @RtnValue (data)
VALUES (@Data)
END
Set @RowData = Substring(@RowData,Charindex(@SplitOn,@RowData)+1,len(@RowData))
Set @Cnt = @Cnt + 1
End
set @Data = ltrim(rtrim(@RowData))
IF NOT EXISTS (SELECT * FROM @RtnValue WHERE data = @Data)
BEGIN
INSERT INTO @RtnValue (data)
VALUES (@Data)
END
Return
END
明确你通过重复的意思的IF条件?你不能只在这里放置一个DISTINCT子句吗? – Neil
数据可能是重复的。将更新问题 – Paparazzi