相比之下,说:

REPLICATE(@padchar, @len - LEN(@str)) + @str

当前回答

select right(replicate(@padchar, @len) + @str, @len)

其他回答

我不确定你给出的方法真的是低效的,但另一种方法,只要它不需要灵活的长度或填充字符,将是(假设你想用“0”到10个字符填充它:

DECLARE
   @pad_characters VARCHAR(10)

SET @pad_characters = '0000000000'

SELECT RIGHT(@pad_characters + @str, 10)

我希望这能帮助到一些人。

STUFF ( character_expression , start , length ,character_expression )

select stuff(@str, 1, 0, replicate('0', @n - len(@str)))

我有一个函数lpad有x个小数 创建函数[dbo].[LPAD_DEC] ( ——在这里添加函数的参数 @pad nvarchar (MAX), @string nvarchar (MAX), @length int, @dec int ) 返回nvarchar (max) 作为 开始 ——在这里声明返回变量 声明@resp nvarchar(max)

IF LEN(@string)=@length
BEGIN
    IF CHARINDEX('.',@string)>0
    BEGIN
        SELECT @resp = CASE SIGN(@string)
            WHEN -1 THEN
                -- Nros negativos grandes con decimales
                concat('-',SUBSTRING(replicate(@pad,@length),1,@length-len(@string)),ltrim(str(abs(@string),@length,@dec)))
            ELSE
                -- Nros positivos grandes con decimales
                concat(SUBSTRING(replicate(@pad,@length),1,@length-len(@string)),ltrim(str(@string,@length,@dec)))                  
            END
    END
    ELSE
    BEGIN
        SELECT @resp = CASE SIGN(@string)
            WHEN -1 THEN
                --Nros negativo grande sin decimales
                concat('-',SUBSTRING(replicate(@pad,@length),1,(@length-3)-len(@string)),ltrim(str(abs(@string),@length,@dec)))
            ELSE
                -- Nros positivos grandes con decimales
                concat(SUBSTRING(replicate(@pad,@length),1,@length-len(@string)),ltrim(str(@string,@length,@dec)))                  
            END                     
    END
END
ELSE
    IF CHARINDEX('.',@string)>0
    BEGIN
        SELECT @resp =CASE SIGN(@string)
            WHEN -1 THEN
                -- Nros negativos con decimales
                concat('-',SUBSTRING(replicate(@pad,@length),1,@length-len(@string)),ltrim(str(abs(@string),@length,@dec)))
            ELSE
                --Ntos positivos con decimales
                concat(SUBSTRING(replicate(@pad,@length),1,@length-len(@string)),ltrim(str(abs(@string),@length,@dec))) 
            END
    END
    ELSE
    BEGIN
        SELECT @resp = CASE SIGN(@string)
            WHEN -1 THEN
                -- Nros Negativos sin decimales
                concat('-',SUBSTRING(replicate(@pad,@length-3),1,(@length-3)-len(@string)),ltrim(str(abs(@string),@length,@dec)))
            ELSE
                -- Nros Positivos sin decimales
                concat(SUBSTRING(replicate(@pad,@length),1,(@length-3)-len(@string)),ltrim(str(abs(@string),@length,@dec)))
            END
    END
RETURN @resp

END

这是我的解决方案。我可以填充任何字符,它是快速的。选择简单。您可以更改可变大小以满足您的需要。

更新了一个参数来处理如果为空返回什么:null如果为空将返回null

CREATE OR ALTER FUNCTION code.fnConvert_PadLeft(
    @in_str nvarchar(1024),
    @pad_length int, 
    @pad_char nchar(1) = ' ', 
    @rtn_null NVARCHAR(1024) = '')
RETURNS NVARCHAR(1024)
AS
BEGIN
     DECLARE @rtn  NCHAR(1024) = ' '
     RETURN RIGHT(REPLACE(@rtn,' ',@pad_char)+ISNULL(@in_str,@rtn_null), @pad_length)
END
GO

CREATE OR ALTER FUNCTION code.fnConvert_PadRight(
    @in_str nvarchar(1024), 
    @pad_length int, 
    @pad_char nchar(1) = ' ', 
    @rtn_null NVARCHAR(1024) = '')
RETURNS NVARCHAR(1024)
AS
BEGIN
     DECLARE @rtn  NCHAR(1024) = ' '
     RETURN LEFT(ISNULL(@in_str,@rtn_null)+REPLACE(@rtn,' ',@pad_char), @pad_length)
END
GO 

-- Example
SET STATISTICS time ON 
SELECT code.fnConvert_PadLeft('88',10,'0',''), 
    code.fnConvert_PadLeft(null,10,'0',''), 
    code.fnConvert_PadLeft(null,10,'0',null), 
    code.fnConvert_PadRight('88',10,'0',''), 
    code.fnConvert_PadRight(null,10,'0',''),
    code.fnConvert_PadRight(null,10,'0',NULL)


0000000088  0000000000  NULL    8800000000  0000000000  NULL

这个怎么样:

replace((space(3 - len(MyField))

3是要填充的零的个数