On Wednesday 29 October 2008 18:39:42 Kevin Duffy wrote:
Hello:
I have a couple of queries that are giving me headaches.
They are actually very simple, but I do not understand why
I am not getting the expected results. Maybe I need new glasses.
Please be kind.
The table
the NULL ISINs in Security is causing
so much grief? I do not get it.
KD
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Andreas Joseph
Krogh
Sent: Wednesday, October 29, 2008 3:58 PM
To: pgsql-sql@postgresql.org
Subject: Re: [SQL] simple SQL query
On Wednesday 29 October 2008 21:56:14 Kevin Duffy wrote:
Gentlemen:
Thanks so much for your assistance.
This returns 512 rows.
select * from tmp_index_member tim
where tim.ISIN NOT IN
(select ISIN from security sec
where ISIN is NOT NULL and
securitytypekey IS NOT
Kevin Duffy [EMAIL PROTECTED] writes:
Can someone explain why the NULL ISINs in Security is causing
so much grief? I do not get it.
NULL generally is taken as unknown in SQL comparisons. So if you have
any nulls in the output of the sub-select, what the upper select sees
is a situation like
