| From: | Bèrto ëd Sèra <berto(dot)d(dot)sera(at)gmail(dot)com> |
|---|---|
| To: | Капралов Александр <alnkapa(at)gmail(dot)com> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Optimize the query, help me please. |
| Date: | 2011-11-23 11:08:37 |
| Message-ID: | CAKwGa_8oFaFzVZqPF6goqKOrSj8Y-oo2jtUoMkrsoE2_Ekv0BQ@mail.gmail.com |
| Views: | Whole Thread | Raw Message | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-general |
Hi,
(SELECT * FROM a limit 10) union (SELECT * FROM b limit 10)
is what you need
Bèrto
2011/11/23 Капралов Александр <alnkapa(at)gmail(dot)com>
> Query is:
> SELECT * FROM a UNION SELECT * FROM b ORDER BY time DESC LIMIT 100
>
> how can i get only last 100 row from a and b and then do union. Explain of
> select said that all recond selected from a and b.
>
> thanks.
>
--
==============================
If Pac-Man had affected us as kids, we'd all be running around in a
darkened room munching pills and listening to repetitive music.
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Achilleas Mantzios | 2011-11-23 11:17:20 | Re: Optimize the query, help me please. |
| Previous Message | Raymond O'Donnell | 2011-11-23 11:07:29 | Re: Optimize the query, help me please. |