Sql: 去除字符串中的相同的字符串函數

---去除字符串中重復的值函數
create function StringRemove(@str nvarchar(2000))
returns varchar(2000)
as
begin
    declare @result nvarchar(2000),@temp nvarchar(1000)
    set @result=''
    set @temp=''
    while(charindex(',',@str)<>0)
        begin
            set @temp=substring(@str,1,charindex(',',@str))   
            if(charindex(@temp,@result)<=0)           
                set @result=@result+@temp       
            set @str=stuff(@str,1,charindex(',',@str),'')
        end
    return @result
end
GO
--('塗聚文','塗','塗聚文','1','23','1')

--測試
select dbo.StringRemove('塗聚文,塗,塗聚文,1,23,1')