Thread: Returned due to virus; was:Status

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EXISTS and IN seem to work ok for:

dynacom=# SELECT count(*) from parts p where p.id in (select md.partid
from machdefs md);
 count
-------
 12656
(1 row)

dynacom=# SELECT count(*) from parts p where exists (select 1 from
machdefs md where md.partid = p.id);
 count
-------
 12656
(1 row)

Whereas IN seems to not working ok when negated as shown below:

dynacom=# SELECT count(*) from parts p where p.id not in (select md.partid
from machdefs md);
 count
-------
     0
(1 row)

dynacom=# SELECT count(*) from parts p where not exists (select 1 from
machdefs md where md.partid = p.id);
 count
-------
   291
(1 row)

dynacom=# SELECT version();
                                                  version
-----------------------------------------------------------------------------------------------------------
 PostgreSQL 7.4.1 on i386-unknown-freebsd5.1, compiled by GCC gcc (GCC)
3.2.2 [FreeBSD] 20030205 (release)
(1 row)


On PostgreSQL 7.4.1 on i686-pc-linux-gnu, compiled by GCC 2.96, i get
identical results.

Is this a known issue? Addressed before?

--
-Achilleus

Achilleus Mantzios <achill@matrix.gatewaynet.com> writes:
> Whereas IN seems to not working ok when negated as shown below:

If the sub-select returns any NULLs then this behavior is per SQL spec.

            regards, tom lane

O kyrios Tom Lane egrapse stis Feb 5, 2004 :

> Achilleus Mantzios <achill@matrix.gatewaynet.com> writes:
> > Whereas IN seems to not working ok when negated as shown below:
>
> If the sub-select returns any NULLs then this behavior is per SQL spec.

Thanx a lot!

>
>             regards, tom lane
>
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--
-Achilleus