Re: a simple SELECT ?

From: Dante <dnotari_at_my-dejanews.com>
Date: Tue, 25 May 1999 10:36:07 GMT
Message-ID: <7iduen$jhh$1@nnrp1.deja.com>

Try

select *
  from (select *

        from mysales
       where id=999

    order by purchase_date desc)
where rownum <=3
/

instead

Regards
Dante

In article <7i7egm$93p$1_at_nnrp1.deja.com>,   shiling_at_math.wayne.edu wrote:
> Be careful when one uses rownum as a criterion. And in this case the
> query result may be wrong if one wants 15-jan-99,14-jan-99,13-jan-99.
>
> SQL> select * from mysales
> 2 where id=999;
>
> ID ITEM UNITS PURCHASE_
> --------- -------- --------- ---------
> 999 12-JAN-99
> 999 15-JAN-99
> 999 13-JAN-99
> 999 14-JAN-99
>
> SQL> select * from mysales
> 2 where id=999 and rownum <=3
> 3 order by purchase_date desc
> 4 /
>
> ID ITEM UNITS PURCHASE_
> --------- -------- --------- ---------
> 999 15-JAN-99
> 999 13-JAN-99
> 999 12-JAN-99
>
> > More simple:
> >
> > select * from deliveries
> > where rownum<=10
> > order by date desc
> >
> >
>
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>

--== Sent via Deja.com http://www.deja.com/ ==-- ---Share what you know. Learn what you don't.--- Received on Tue May 25 1999 - 05:36:07 CDT