常用sql自定义函数

--把数字转为千分位格式的字符串显示，调用如 select dbo.f_splitstr(11111111111111)

CREATE FUNCTION  [dbo].[f_splitstr](

    @str varchar()
)
RETURNS nvarchar()
AS
BEGIN
declare @lenNum int
 set @lenNum= len(@str)
 declare @nodeIndex int
 if(@lenNum>)
 set @str=STUFF(@str,@lenNum-,,',')
 if(@lenNum>)
 set @str=STUFF(@str,@lenNum-,,',')
 if(@lenNum>)
 set @str=STUFF(@str,@lenNum-,,',')
 if(@lenNum>)
 set @str=STUFF(@str,@lenNum-,,',')
 return @str
END