Re: [GENERAL] SELECT …. WHERE id is in pool of ids of subquery……

Heureka, it works.
Thanks!

Am 26.09.2012 um 22:37 schrieb David Johnston:

> On Sep 26, 2012, at 16:28, Alexander Reichstadt <lxr(at)mac(dot)com> wrote:
>
>> Hi,
>>
>> I am reading the docu and am looking for an example our explanation as to the difference of setof and arrays.
>>
>> But maybe this is not even relevant. The reason I am looking for this is because I need to build a function that looks for all records whose ids are in a pool of other records.
>>
>> Maybe this is not making any sense....
>>
>> So, here is my function:
>> defect_usermessageids "refid_userid" bigint setof record sql
>> Definition
>> 1
>> 2
>> SELECT DISTINCT messages.id FROM messages
>> JOIN message_recipients msgrec ON msgrec.refid_messages=messages.id AND (msgrec.refid_qmusers=$1 OR messages.refid_sender=$1)
>>
>> It returns all the IDs of messages of which a given user, the input arg refid_userid, is either a recipient or a sender.
>>
>> This works as expected.
>>
>> Now I'd like to get the messages for these ids, but it doesn't work.
>>
>> It should be something like
>>
>> SELECT * FROM messages WHERE ID EXISTS (SELECT defect_usermessageids(2))
>>
>> But this doesn't work.
>>
>> Please, can someone enlighten me?
>>
>> Thanks and regards
>> Alex
>
>
> "SETOF record" is likely not what you want since ID is a single value not a "record".
>
> The data type of ID is what you want to return a SETOF of.
>
> You also want to use IN, not EXISTS. You generally only use EXISTS with a correlated sub-query but in this case the sub-query is constant.
>
> David J.