From: | zkn <zkn(at)abv(dot)bg> |
---|---|
To: | pgsql-sql(at)postgresql(dot)org |
Cc: | Gordon Ross <gr306(at)ucs(dot)cam(dot)ac(dot)uk> |
Subject: | Re: Unable to get UPDATE ... FROM syntax correct |
Date: | 2010-02-19 10:28:10 |
Message-ID: | FA778767-AE75-4A0C-A60E-2EC0E3F69841@abv.bg |
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Thread: | |
Lists: | pgsql-sql |
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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