sql server lpad rpad

最新推荐文章于 2022-04-24 09:16:55 发布

原创最新推荐文章于 2022-04-24 09:16:55 发布 · 1k 阅读

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本文介绍如何在SQL中创建LPad和RPad函数，用于字符串左侧填充和右侧填充。通过具体实例展示了这两个函数的工作原理及用法。

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-- ================================================
-- Template generated from Template Explorer using:
-- Create Scalar Function (New Menu).SQL
--
-- Use the Specify Values for Template Parameters 
-- command (Ctrl-Shift-M) to fill in the parameter 
-- values below.
--
-- This block of comments will not be included in
-- the definition of the function.
-- ================================================
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author:		patrick
-- Create date: 2018
-- Description:	
-- =============================================
CREATE FUNCTION Lpad 
(
	-- Add the parameters for the function here
	@str nvarchar(100),@len INT,@fix NVARCHAR(1)
)
RETURNS nvarchar(100)
AS
BEGIN
	-- Declare the return variable here
	DECLARE @res nvarchar(100)
	
	

	-- Add the T-SQL statements to compute the return value here
	SELECT @res = replicate(@fix,@len-len(@str))+@str

	-- Return the result of the function
	RETURN @res

END
GO


CREATE FUNCTION Rpad 
(
	-- Add the parameters for the function here
	@str nvarchar(100),@len INT,@fix NVARCHAR(1)
)
RETURNS nvarchar(100)
AS
BEGIN
	-- Declare the return variable here
	DECLARE @res nvarchar(100)
	
	

	-- Add the T-SQL statements to compute the return value here
	SELECT @res = @str+replicate(@fix,@len-len(@str))

	-- Return the result of the function
	RETURN @res

END
GO

SELECT dbo.lpad('abc',10,'0'),dbo.rpad('abc',10,'0')