SQL Server 实现类似C#中 PadLeft功能

 USE [Test]
 GO
 SET ANSI_NULLS ON
 GO
 SET QUOTED_IDENTIFIER ON
 GO
 --@column 表示字段或者常量，@paddingChar  表示 补位字符， @len  补位数量， @returnStr
 create function [dbo].[PadLeft](@column varchar(16),@paddingChar char(1),@len int)

 returns varchar(16) as
     begin
         declare @returnStr varchar(16)
         select @returnStr = isnull(replicate(@paddingChar,@len - len(isnull(@column ,0))), '') + @column
         return @returnStr
     end