Re: Unable to get UPDATE ... FROM syntax correct

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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