PadLeft function in T-SQL

Question

I have the following table A:

id
----
1
2
12
123
1234

I need to left-pad the id values with zero\'s:

id
----
0         


        

Answer 1

Create Function :

    Create FUNCTION [dbo].[PadLeft]
      (
        @Text NVARCHAR(MAX) ,
        @Replace NVARCHAR(MAX) ,
        @Len INT
      )
RETURNS NVARCHAR(MAX)
AS
    BEGIN 


        DECLARE @var NVARCHAR(MAX) 

        SELECT @var = ISNULL(LTRIM(RTRIM(@Text)) , '')


        RETURN   RIGHT(REPLICATE(@Replace,@Len)+ @var, @Len)


    END

Example:

Select dbo.PadLeft('123456','0',8)