| From: | "George Pavlov" <gpavlov(at)mynewplace(dot)com> |
|---|---|
| To: | "Alexander Staubo" <alex(at)purefiction(dot)net>, "MicroUser" <a(dot)shafar(at)gmail(dot)com> |
| Cc: | <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: ORDER BY |
| Date: | 2006-11-15 22:59:04 |
| Message-ID: | 8C5B026B51B6854CBE88121DBF097A865D43BB@ehost010-33.exch010.intermedia.net |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-general |
> For larger tables, you may have to resort to a
> union:
>
> select * from foo where name != 'Other' order by name
> union
> select * from foo where name = 'Other'
Alas, this suggestion is wrong on two counts: (a) UNION expects a single
ORDER BY that applies to the whole recordset and which has to come at
the end; (b) UNION re-sorts anyway (it needs to eliminate the dupes) --
maybe you are thinking UNION ALL? So, to follow your advice he may want
a query like this, although it seems quite silly and there still isn't
an ironclad guarantee re. the final result sorting:
select * from
(select * from foo where name != 'Other' order by name) x
union all
select * from foo where name = 'Other'
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