Re: Verifying a timestamp is null or in the past

Hello again, please 1 more question:

can I have a SELECT statement inside of an IF-conditional?

The doc
http://www.postgresql.org/docs/8.4/static/plpgsql-control-structures.html
does not list such an example.

I'm asking, because I'd like to get rid of the has_vip
variable in my rewritten procedure below:

/* move 1 week of VIP-status from
player _from to player _to */

create or replace function pref_move_week(_from varchar,
_to varchar) returns void as $BODY$
declare
has_vip timestamp;
begin

select vip into has_vip from pref_users
where id=_from
and vip > current_timestamp + interval '1 week';

if (has_vip is NULL) then
return;
end if;

update pref_users set
vip = vip - interval '1 week'
where id=_from;

update pref_users set
vip = greatest(vip, current_timestamp) + interval '1 week'
where id=_to;

end;
$BODY$ language plpgsql;