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SELECT ID FROM dbo.SplitIds('1,2,3,4,5')


CREATE FUNCTION [dbo].[SplitIds](
  @identities varchar(2000)
)
RETURNS 
@IdList table(  ID int )
AS
BEGIN
  DECLARE @ID varchar(10), @idx int

  SELECT @identities = LTRIM(RTRIM(@identities))+ ','
  SELECT @idx = CHARINDEX(',', @identities, 1)

  IF REPLACE(@identities, ',', '') <> ''
  BEGIN
    WHILE @idx > 0
    BEGIN
      SELECT @ID = LTRIM(RTRIM(LEFT(@identities, @idx - 1)))
      IF @ID <> ''
      BEGIN
        INSERT INTO @IdList (ID) 
        VALUES (CAST(@ID AS int))
      END
      SET @identities = RIGHT(@identities, LEN(@identities) - @idx)
      SET @idx = CHARINDEX(',', @identities, 1)
    END
  END  
  RETURN
END