Search Postgresql Archives

Re: Howto sort the result of UNION (without modifying its type)?

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 




On 04/08/2011 03:44 PM, Clemens Eisserer wrote:
Hi,

I have a query where I UNION several select statements which return
IDs of type INTEGER.
This works well, if the IDs don't need to be sorted:
SELECT id FROM table WHERE id IN ((select id FROM table WHERE ...) UNION (SELECT id  FROM table_ WHERE ....))


However I need the result the UNIONs to be sorted, so I tried the following:

SELECT id FROM table WHERE id IN (SELECT col0 FROM ((select id FROM table WHERE ...) UNION (SELECT id  FROM table_ WHERE ....)) AS col0 ORDER BY col0 OFFSET X LIMIT Y)
FEHLER:  Operator existiert nicht: integer = record
ERROR: Operator does not exist: integer = record
LINE 1: Select id FROM table WHERE id IN (Select col0 FROM ...

Is there any way to get the results of UNIONs sorted, without
converting it to record?

Thanks, Clemens

PS: I know the query looks really stupid, however the queries I UNION
are auto-generated SQL.
I don't have much choice here to write the query more efficient :/


does this work for you?

	select u.id from (your unions) as u order by u.id

--
Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-general


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Index of Archives]     [Postgresql Jobs]     [Postgresql Admin]     [Postgresql Performance]     [Linux Clusters]     [PHP Home]     [PHP on Windows]     [Kernel Newbies]     [PHP Classes]     [PHP Books]     [PHP Databases]     [Postgresql & PHP]     [Yosemite]
  Powered by Linux