RE: select an entry with a NULL date field

I think undefined is the exact result for that comparison, therefore the
returned error. False value will not be an error.

--
Jesus Aneiros Sosa
mailto:aneiros@jagua.cfg.sld.cu
http://jagua.cfg.sld.cu/~aneiros

On Mon, 14 Aug 2000, Henry Lafleur wrote:

> 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
>