Re: date index problems

On Fri, 21 Mar 2003, Christopher Kings-Lynne wrote:

> This behaviour I find unusual:
>
> usa=# explain analyze select user_id, plan_next from users_profiles where
> plan_next = '2003-01-01';
> QUERY PLAN
> ----------------------------------------------------------------------------
> -------------------------------------------------------------------
> Index Scan using users_profiles_plan_next_key on users_profiles
> (cost=0.00..614.01 rows=228 width=8) (actual time=0.41..0.41 rows=0 loops=1)
> Index Cond: (plan_next = '2003-01-01'::date)
> Total runtime: 0.49 msec
> (3 rows)
>
> usa=# explain analyze select user_id, plan_next from users_profiles where
> plan_next = '2003-01-01'::date - interval '1 week';
> QUERY PLAN
> ----------------------------------------------------------------------------
> -----------------------------------
> Seq Scan on users_profiles (cost=0.00..1076.08 rows=184 width=8) (actual
> time=109.48..109.48 rows=0 loops=1)
> Filter: ((plan_next)::timestamp without time zone = '2002-12-25
> 00:00:00'::timestamp without time zone)
> Total runtime: 109.56 msec
> (3 rows)

I presume the type of plan_next is 'date'. Does casting '2003-01-01'::date
- interval '1 week' to date help?

Gavin