RE: select an entry with a NULL date field

Comparing anything = NULL (if it would work) would always false, at least
that's how other servers treat it. You have to use IS NULL.

select entry_id from tbl_date where date_02 IS NULL;

Henry


-----Original Message-----
From: Web Manager [mailto:web@inter-resa.com]
Sent: Monday, August 14, 2000 9:03 AM
To: pgsql-sql@postgresql.org
Subject: [SQL] select an entry with a NULL date field


Hello,


I have a problem with PostgreSQL when I try to select or delete an entry
with an empty date. That's a typical entry

Table tbl_date
-----------------------------
entry_id    154
date_01    2000-01-15
date_02    this date is NULL
name        my_test
-----------------------------

I want to select every entry containing date_02 as NULL
I tried :
>select entry_id from tbl_date where date_02=NULL;
ERROR:  parser: parse error at or near "null"
>select entry_id from tbl_date where date_02='';
Not work, that's a wrong date format
>select entry_id from tbl_date where date_02="";
Not work, "" considered as an attribute

Thank you for your time!
-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Marc Andre Paquin