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	id AA19756; Wed, 4 Mar 92 18:53:30 -0800
Date: Wed, 4 Mar 92 18:53:30 -0800
Message-Id: <9203050253.AA19756@postgres.Berkeley.EDU>
From: Sushil Da Silva <dasilva@cs.columbia.edu>
Subject: null values in attributes
To: postgres@postgres.berkeley.edu
Sender: pg_adm@postgres.berkeley.edu

Hi,

We are trying to retrieve tuples from a class, selecting on a
attributed that is undefined or null. Here's the query:

-----------
Go
* retrieve (s.all) from s in student where placed_in = NULL
\g

Query sent to backend is "retrieve (s.all) from s in student where
placed_in = NULL "
Error: No response from the backend, exiting...
-----------

As you can see, the monitor hangs for a while and then exits without
delivering any results. Can anyone tell me what we're doing wrong?
We greatly appreciate any help.

Thanks
Sushil da Silva