Re: distinct
| От | bmccoy@chapelperilous.net |
|---|---|
| Тема | Re: distinct |
| Дата | |
| Msg-id | Pine.LNX.4.10.10010092145010.4175-100000@chapelperilous.net обсуждение исходный текст |
| Ответ на | distinct (andrew@networkcomputerz.com) |
| Список | pgsql-general |
On Tue, 3 Oct 2000 andrew@networkcomputerz.com wrote:
> I have attempted to run
> select distinct col1 from tablename;
> and it runs fine.
>
> When I run it in a real world environment: select distinct col1, col2,
> col3, col4 from tablename order by col1 desc, col2; It returns all the
> values from col1 which appears to be the same thing as not using
> distinct at all.
The DISTINCT constraint applies to all of the columns you are selecting,
not just the first one -- it selects all of the distinct TUPLES from the
query.
Brett W. McCoy
http://www.chapelperilous.net
---------------------------------------------------------------------------
The Kennedy Constant:
Don't get mad -- get even.
В списке pgsql-general по дате отправления: