Bob Pawley <[EMAIL PROTECTED]> writes:
> What I have is one table which stores device_id numbers that are referenced 
> on the second table "library.devices".
> I need to insert device_ids from the first table that satisfy the conditions 
> of the argument found on the library table. Hence the 'where' clause.

This isn't real clear to me, but perhaps you are looking for something
like

        IF EXISTS(select 1 from library.devices where ...) THEN
                INSERT INTO ... values(new.device_id);
        END IF;

                        regards, tom lane

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