Re: Queries give impossible results

"Jake S" <nospam_at_nospam.net> wrote in message news:<jtLA9.151$ZR5.5062_at_read2.inet.fi>...
> I'm having strange problems with Oracle (8.1.7). Queries give results that
> are not possible. I added a simple example below. First two count values are
> correct, third is not possible, as you can see. Have you ever seen anything
> like this?
>
> I've discussed this with several colleagues but this is something new for
> them also. This has been hard to believe for them also, so they have tried
> these by themselves. Some queries give correct results but some doesn't.
> I've used sqlplus, Oracle Enterprice Manager and Toad so the software is not
> the problem.
>
> - Jake -
>
> SQL> select count(*) from ci_customer;
>
> COUNT(*)
> ----------
> 138295
>
> SQL> SELECT count(*) FROM ci_customer WHERE customer_state = 'ACTIVE';
>
> COUNT(*)
> ----------
> 135324
>
> SQL> SELECT count(*) FROM ci_customer WHERE customer_type <> 'PERSON';
>
> COUNT(*)
> ----------
> 138292
>
> SQL> SELECT count(*) FROM ci_customer WHERE customer_state = 'ACTIVE' AND
> customer_type <> 'PERSON';
>
> COUNT(*)
> ----------
> 4

Jake,

The wrong result might be related to a bug in "bitmap conversion". Can you check what the execution plan is for the last query? You could also try something like

SELECT /*+ RULE */ count(*)
FROM ci_customer
WHERE customer_state = 'ACTIVE'
AND customer_type <> 'PERSON';

Regards,
Mike Received on Thu Nov 14 2002 - 11:54:19 CST