SQL分割與去重

 

-----------建立實現split功能 的函數------------
create function f_split(@SourceSql varchar(8000),@StrSeprate varchar(10))
returns @temp table(a varchar(100))
as
begin
    declare @i int
    set @SourceSql=rtrim(ltrim(@SourceSql))
    set @i=charindex(@StrSeprate,@SourceSql)
    while @i>=1
    begin
        insert @temp values(left(@SourceSql,@i-1))
        set @SourceSql=substring(@SourceSql,@i+1,len(@SourceSql)-@i)
        set @i=charindex(@StrSeprate,@SourceSql)
    end
    if @SourceSql<>''
       insert @temp values(@SourceSql)
    return
end
GO

-----------建立實現split並去重功能 的函數------------
create function SplitAndDistinct(@SourceStr varchar(500),@StrSeprate varchar(10))
    returns varchar(500)
AS
begin
declare @pos int
declare @ret varchar(20)
declare @table table(ret varchar(20))
declare @SplitAndDistinctStr varchar(500)
select @SourceStr = @SourceStr + @StrSeprate
select @pos = charindex(@StrSeprate,@SourceStr)
while @pos > 0
begin
    select @ret = substring(@SourceStr,1,@pos-1)
    insert into @table select @ret
    select @SourceStr = stuff(@SourceStr,1,@pos,'')
    select @pos = charindex(@StrSeprate,@SourceStr)
end
select @SplitAndDistinctStr = ''
select @SplitAndDistinctStr = @SplitAndDistinctStr + @StrSeprate + ret from (select distinct ret from @table) t
return @SplitAndDistinctStr
end
GO

-----------測試------------

select distinct * from dbo.f_split('123|abc|000|777|000 |111', '|')
Go
select  dbo.SplitAndDistinct('123|abc|000|777|000|111 ', '|')

GO