On Fri, 10 Feb 2006, Sergei Dubov wrote:
> I have two tables, let's say A and B.
> B is a child of a in one to many relationship. A contains records that are
> not referenced by B.
> I am running a query:
> select * from A t1 where t1.id not in (select t2.A_id from B t2);
> It returns 0 rows.
> Now I run
> (select t1.id from A t1) except (select t2.A_id from B t2);
> And now Postgres correctly returns records from A that are not referenced by
This may not be a bug, since these two queries will do different things if
there are any nulls in B.A_id according to spec AFAIK. The short form is
that rvc NOT IN (<subselect returning nulls>) will not return true.
In response to
pgsql-bugs by date
|Next:||From: Magnus Hagander||Date: 2006-02-11 15:45:27|
|Subject: Re: BUG #2244: silent installation to set password never expires|
|Previous:||From: Sergei Dubov||Date: 2006-02-10 23:48:25|
|Subject: BUG #2251: NOT IN clause is not working correctly|