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* Unable to get UPDATE ... FROM syntax correct
@ 2010-02-19 09:25 Gordon Ross <gr306@ucs.cam.ac.uk>
0 siblings, 2 replies; 6+ messages in thread
From: Gordon Ross @ 2010-02-19 09:25 UTC (permalink / raw)
To: pgsql-sql
I have two tables:
Table "public.audit"
Column | Type | Modifiers
------------+----------------------+-----------
id | integer | (serial)
record_id | integer | not null
key | character varying |
(...)
Table "public.extension"
Column | Type | Modifiers
---------+------------+------------
id | integer | (serial)
number | integer |
(...)
The column "key" was recently added to the "audit" table, and I wish to
populate it with the value form the "number" column in the extension table.
The join between the tables is audit.record_id = extension.id
I tried:
UPDATE audit SET key = extension.number FROM extension WHERE audit.record_id
= extension.number;
But that returns saying "UPDATE 0"
However, doing:
SELECT audit.record_id, extension.number FROM audit, extension WHERE
audit.record_id = extension.id;
Works fine.
Can someone tell me what I'm doing wrong ?
Thanks,
GTG
^ permalink raw reply [nested|flat] 6+ messages in thread
* Re: Unable to get UPDATE ... FROM syntax correct
@ 2010-02-19 10:28 zkn <zkn@abv.bg>
parent: Gordon Ross <gr306@ucs.cam.ac.uk>
1 sibling, 1 reply; 6+ messages in thread
From: zkn @ 2010-02-19 10:28 UTC (permalink / raw)
To: pgsql-sql; +Cc: Gordon Ross <gr306@ucs.cam.ac.uk>
update audit set key = (select extension.number from extension where audit.record_id = extension_id)
On 19.02.2010, at 11:25, Gordon Ross wrote:
> I have two tables:
>
> Table "public.audit"
> Column | Type | Modifiers
> ------------+----------------------+-----------
> id | integer | (serial)
> record_id | integer | not null
> key | character varying |
> (...)
>
>
> Table "public.extension"
> Column | Type | Modifiers
> ---------+------------+------------
> id | integer | (serial)
> number | integer |
> (...)
>
>
> The column "key" was recently added to the "audit" table, and I wish to
> populate it with the value form the "number" column in the extension table.
> The join between the tables is audit.record_id = extension.id
>
> I tried:
>
> UPDATE audit SET key = extension.number FROM extension WHERE audit.record_id
> = extension.number;
>
> But that returns saying "UPDATE 0"
>
> However, doing:
>
> SELECT audit.record_id, extension.number FROM audit, extension WHERE
> audit.record_id = extension.id;
>
> Works fine.
>
> Can someone tell me what I'm doing wrong ?
>
> Thanks,
>
> GTG
>
>
> --
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> To make changes to your subscription:
> http://www.postgresql.org/mailpref/pgsql-sql
>
^ permalink raw reply [nested|flat] 6+ messages in thread
* Re: Unable to get UPDATE ... FROM syntax correct
@ 2010-02-19 10:32 Gordon Ross <gr306@ucs.cam.ac.uk>
parent: zkn <zkn@abv.bg>
0 siblings, 0 replies; 6+ messages in thread
From: Gordon Ross @ 2010-02-19 10:32 UTC (permalink / raw)
To: pgsql-sql
On 19/02/2010 10:28, "zkn" <zkn@abv.bg> wrote:
> update audit set key = (select extension.number from extension where
> audit.record_id = extension_id)
No joy, I still get "UPDATE 0"
:-(
GTG
^ permalink raw reply [nested|flat] 6+ messages in thread
* Re: Unable to get UPDATE ... FROM syntax correct
@ 2010-02-19 10:36 Richard Huxton <dev@archonet.com>
parent: Gordon Ross <gr306@ucs.cam.ac.uk>
1 sibling, 1 reply; 6+ messages in thread
From: Richard Huxton @ 2010-02-19 10:36 UTC (permalink / raw)
To: Gordon Ross <gr306@ucs.cam.ac.uk>; +Cc: pgsql-sql
On 19/02/10 09:25, Gordon Ross wrote:
>
> UPDATE audit SET key = extension.number FROM extension WHERE audit.record_id
> = extension.number;
>
> But that returns saying "UPDATE 0"
Works here - are you sure you don't have any triggers interfering?
BEGIN;
CREATE TEMP TABLE audit (
id int,
record_id int,
key varchar,
PRIMARY KEY (id)
);
CREATE TEMP TABLE extension (
id int,
number int,
PRIMARY KEY (id)
);
INSERT INTO audit VALUES (1,1,''), (2,2,''), (3,3,'');
INSERT INTO extension VALUES (-1,1), (-2,2), (-3,3);
UPDATE audit SET key = extension.number
FROM extension
WHERE audit.record_id = extension.number;
SELECT * FROM audit ORDER BY id;
ROLLBACK;
CREATE TABLE
INSERT 0 3
INSERT 0 3
UPDATE 3
id | record_id | key
----+-----------+-----
1 | 1 | 1
2 | 2 | 2
3 | 3 | 3
--
Richard Huxton
Archonet Ltd
^ permalink raw reply [nested|flat] 6+ messages in thread
* Re: Unable to get UPDATE ... FROM syntax correct
@ 2010-02-19 10:58 Gordon Ross <gr306@ucs.cam.ac.uk>
parent: Richard Huxton <dev@archonet.com>
0 siblings, 1 reply; 6+ messages in thread
From: Gordon Ross @ 2010-02-19 10:58 UTC (permalink / raw)
To: pgsql-sql
On 19/02/2010 10:36, "Richard Huxton" <dev@archonet.com> wrote:
> Works here - are you sure you don't have any triggers interfering?
Doh ! *blush*
Yes, I did, to stop anyone tampering with the audit table ;-)
Thanks for that.
GTG
^ permalink raw reply [nested|flat] 6+ messages in thread
* Re: Unable to get UPDATE ... FROM syntax correct
@ 2010-02-19 11:33 Richard Huxton <dev@archonet.com>
parent: Gordon Ross <gr306@ucs.cam.ac.uk>
0 siblings, 0 replies; 6+ messages in thread
From: Richard Huxton @ 2010-02-19 11:33 UTC (permalink / raw)
To: Gordon Ross <gr306@ucs.cam.ac.uk>; +Cc: pgsql-sql
On 19/02/10 10:58, Gordon Ross wrote:
> On 19/02/2010 10:36, "Richard Huxton"<dev@archonet.com> wrote:
>
>> Works here - are you sure you don't have any triggers interfering?
>
> Doh ! *blush*
>
> Yes, I did, to stop anyone tampering with the audit table ;-)
There you go - it worked :-)
--
Richard Huxton
Archonet Ltd
^ permalink raw reply [nested|flat] 6+ messages in thread
end of thread, other threads:[~2010-02-19 11:33 UTC | newest]
Thread overview: 6+ messages (download: mbox mbox.gz follow: Atom feed)
-- links below jump to the message on this page --
2010-02-19 09:25 Unable to get UPDATE ... FROM syntax correct Gordon Ross <gr306@ucs.cam.ac.uk>
2010-02-19 10:28 ` zkn <zkn@abv.bg>
2010-02-19 10:32 ` Gordon Ross <gr306@ucs.cam.ac.uk>
2010-02-19 10:36 ` Richard Huxton <dev@archonet.com>
2010-02-19 10:58 ` Gordon Ross <gr306@ucs.cam.ac.uk>
2010-02-19 11:33 ` Richard Huxton <dev@archonet.com>
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