Sql Function to Split a string and return a table

create ALTER FUNCTION [dbo].[Split]
(
 @RowData nvarchar(2000),
 @SplitOn nvarchar(5)
)  
RETURNS @RtnValue table 
(
 Id int identity(1,1),
 Data nvarchar(100)
) 
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

use it like this:

select * from dbo.Split('a,b,c,d,e,f,g',',')