On Sep 26, 2012, at 16:28, Alexander Reichstadt <
lxr@mac.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.
