I've got another great advice to use DELETE ... USING
instead of DELETE ... (SUB-SELECT),
so my procedure looks now like this (for archive):
create or replace function pref_delete_user(_id varchar,
_reason varchar) returns void as $BODY$
begin
create temporary table temp_gids (gid int not null) on
commit drop;
insert into temp_gids (gid) select gid from
pref_scores where id=_id;
delete from pref_scores p
using temp_gids t
where p.gid = t.gid;
delete from pref_games p
using temp_gids t
where p.gid = t.gid;
/* more delete's here */
end;
$BODY$ language plpgsql;
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