> select * from sometable where somefield IS NULL won't work because IS
is
> not a nomally indexible operator.

Ah, I didn't know that.  So there is no real reason not to exclude null
values from all your indexes :).  Reading Tom's recent comments
everything is clear now.

Instead of using your two index approach I prefer to:
create function nullidx(anyelement) returns boolean as $$ select $1 is
null; $$ language
sql immutable;

create index on t(nullidx(f)); -- etc

Merlin

---------------------------(end of broadcast)---------------------------
TIP 1: if posting/reading through Usenet, please send an appropriate
       subscribe-nomail command to [EMAIL PROTECTED] so that your
       message can get through to the mailing list cleanly

Reply via email to