From: | Patrick Welche <prlw1(at)newn(dot)cam(dot)ac(dot)uk> |
---|---|
To: | pgsql-general(at)postgresql(dot)org |
Subject: | null answer - how? |
Date: | 2001-09-19 17:17:00 |
Message-ID: | 20010919181700.Q4398@quartz.newn.cam.ac.uk |
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Lists: | pgsql-general |
select coalesce(sum(deltafromoctets),0)
from trans,stats
where stats_id=stats.id
and (timeslicet < '1:05' OR timeslicet > '6:05')
returns a number (9188191930), whereas
select coalesce(sum(deltafromoctets),0)
from trans,stats
where stats_id=stats.id
and (timeslicet < '1:05' OR timeslicet > '6:05')
and timesliced < '01-May-2001'
prints 0 (or null without the coalesce) as does
select coalesce(sum(deltafromoctets),0)
from trans,stats
where stats_id=stats.id
and timesliced < '01-May-2001'
How can this be?
select * from stats where timesliced is null or timeslicet is null
select * from trans where deltafromoctets is null
both retun 0 rows.
stats_id and stats.id are "not null"
timesliced date, timeslicet time, deltrafromoctets bigint.
Any hints?
Cheers,
Patrick
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