From: | Oleg Broytmann <phd(at)sun(dot)med(dot)ru> |
---|---|
To: | "Thomas G(dot) Lockhart" <lockhart(at)alumni(dot)caltech(dot)edu> |
Cc: | PostgreSQL-development <pgsql-hackers(at)postgreSQL(dot)org> |
Subject: | Re: [HACKERS] Bug on complex join |
Date: | 1999-03-05 15:13:50 |
Message-ID: | Pine.SOL2.3.96.SK.990305181036.12319A-100000@sun.med.ru |
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Thread: | |
Lists: | pgsql-hackers |
Hi!
On Fri, 5 Mar 1999, Thomas G. Lockhart wrote:
> > SELECT sh.distr_id , d.distr_id
> > FROM central cn, shops sh, districts d
> > WHERE cn.shop_id = sh.shop_id
> > and got 27963 rows.
> > But the query
> > SELECT d.*
> > FROM central cn, shops sh, districts d
> > WHERE cn.shop_id = sh.shop_id AND sh.distr_id = d.distr_id
>
> Why did you change both the target columns *and* the query qualification
> between these two examples? Is the "SELECT d.*" required to get the
> query to fail?? If not, then...
Cause I need something in the target list. Wrong way to test it? What is
a better way?
> For some reason sh.distr_id is not equal to d.distr_id. Are they
> different data types? Do they have some embedded blanks?? Probably not a
Both are int2. No blanks (at least I cannot imagine blanks in int2 :).
> Postgres bug, since the query itself looks pretty simple...
That's why I am very confused. :(
>
> - Tom
>
Oleg.
----
Oleg Broytmann National Research Surgery Centre http://sun.med.ru/~phd/
Programmers don't die, they just GOSUB without RETURN.
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