| 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 |
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| 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.
>
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