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* COALESCE in ORDER BY...
@ 2003-05-17 16:40 Terry Yapt <pgsql@technovell.com>
2003-05-17 17:14 ` Re: COALESCE in ORDER BY... Andreas Schmitz <andreas.schmitz@as-dataservice.de>
0 siblings, 1 reply; 4+ messages in thread
From: Terry Yapt @ 2003-05-17 16:40 UTC (permalink / raw)
To: pgsql-sql
Why this doesn't run on postrgreSQL 7.3.1 ?
www=> SELECT 10 AS first ORDER BY first DESC;
first
-------
10
(1 row)
www=> SELECT 10 AS first ORDER BY COALESCE(first,0) DESC;
ERROR: Attribute "first" not found
Thanks in advance..
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: COALESCE in ORDER BY...
2003-05-17 16:40 COALESCE in ORDER BY... Terry Yapt <pgsql@technovell.com>
@ 2003-05-17 17:14 ` Andreas Schmitz <andreas.schmitz@as-dataservice.de>
2003-05-17 17:41 ` Re: COALESCE in ORDER BY... Stephan Szabo <sszabo@megazone23.bigpanda.com>
0 siblings, 1 reply; 4+ messages in thread
From: Andreas Schmitz @ 2003-05-17 17:14 UTC (permalink / raw)
To: Terry Yapt <pgsql@technovell.com>; +Cc: pgsql-sql
Terry Yapt wrote:
>www=> SELECT 10 AS first ORDER BY COALESCE(first,0) DESC;
>ERROR: Attribute "first" not found
>
>Thanks in advance..
>
>
Perhaps, this is a bug, but I have a workarround for you till this is
clariefied:
SELECT *
FROM (SELECT 10 AS FIRST) AS vtbl
ORDER BY COALESCE(vtbl.first,0) DESC;
(Tested with 7.3.2)
Best regards
--
Andreas Schmitz
AS-DataService <http://www.as-dataservice.de;
Kastanienallee 24
D-54662 Speicher
Tel.: (0 65 62) 93 05 17
Fax: (0 65 62) 93 05 18
Email: andreas.schmitz@as-dataservice.de
<mailto:andreas.schmitz@as-dataservice.de>
Ust-IdNr.: DE211466407
Handelsregister: HRA 1869 - Amtsgericht Bitburg
<http://www.as-dataservice.de;
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: COALESCE in ORDER BY...
2003-05-17 16:40 COALESCE in ORDER BY... Terry Yapt <pgsql@technovell.com>
2003-05-17 17:14 ` Re: COALESCE in ORDER BY... Andreas Schmitz <andreas.schmitz@as-dataservice.de>
@ 2003-05-17 17:41 ` Stephan Szabo <sszabo@megazone23.bigpanda.com>
0 siblings, 0 replies; 4+ messages in thread
From: Stephan Szabo @ 2003-05-17 17:41 UTC (permalink / raw)
To: Andreas Schmitz <andreas.schmitz@as-dataservice.de>; +Cc: Terry Yapt <pgsql@technovell.com>; pgsql-sql
On Sat, 17 May 2003, Andreas Schmitz wrote:
> Terry Yapt wrote:
>
> >www=> SELECT 10 AS first ORDER BY COALESCE(first,0) DESC;
> >ERROR: Attribute "first" not found
> >
> >Thanks in advance..
> >
> >
> Perhaps, this is a bug, but I have a workarround for you till this is
> clariefied:
Just an unimplemented enhancement I think. At least in SQL92, order
by expressions need to be column references (possibly with collation
conversions), we allow some functional order by expressions, but not one's
referencing select aliases I think.
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: COALESCE in ORDER BY...
@ 2003-05-18 11:27 Terry Yapt <pgsql@technovell.com>
0 siblings, 0 replies; 4+ messages in thread
From: Terry Yapt @ 2003-05-18 11:27 UTC (permalink / raw)
To: andreas.schmitz@as-dataservice.de; +Cc: pgsql-sql
Ok Thanks Andreas, but It was only curiosity because in Oracle I usually use this kind of ORDER BY on SQL's.
Thanks...
-----Original Message-----
From: Andreas Schmitz <andreas.schmitz@as-dataservice.de>
To: Terry Yapt <pgsql@technovell.com>
Date: Sat, 17 May 2003 19:14:09 +0200
Subject: Re: [SQL] COALESCE in ORDER BY...
Terry Yapt wrote:
>www=> SELECT 10 AS first ORDER BY COALESCE(first,0) DESC;
>ERROR: Attribute "first" not found
>
>Thanks in advance..
>
>
Perhaps, this is a bug, but I have a workarround for you till this is
clariefied:
SELECT *
FROM (SELECT 10 AS FIRST) AS vtbl
ORDER BY COALESCE(vtbl.first,0) DESC;
(Tested with 7.3.2)
Best regards
--
Andreas Schmitz
AS-DataService <http://www.as-dataservice.de;
Kastanienallee 24
D-54662 Speicher
Tel.: (0 65 62) 93 05 17
Fax: (0 65 62) 93 05 18
Email: andreas.schmitz@as-dataservice.de
<mailto:andreas.schmitz@as-dataservice.de>
Ust-IdNr.: DE211466407
Handelsregister: HRA 1869 - Amtsgericht Bitburg
<http://www.as-dataservice.de;
^ permalink raw reply [nested|flat] 4+ messages in thread
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2003-05-17 16:40 COALESCE in ORDER BY... Terry Yapt <pgsql@technovell.com>
2003-05-17 17:14 ` Andreas Schmitz <andreas.schmitz@as-dataservice.de>
2003-05-17 17:41 ` Stephan Szabo <sszabo@megazone23.bigpanda.com>
2003-05-18 11:27 Re: COALESCE in ORDER BY... Terry Yapt <pgsql@technovell.com>
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