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Date: Thu, 23 Jul 92 05:20:01 -0700
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From: Rainer Staringer <rainer@fml.tuwien.ac.at>
Subject: How to retrieve only rows with null-values?
To: postgres@postgres.berkeley.edu
Sender: pg_adm@postgres.berkeley.edu

I have a very simple question which I could not solve using the docs:

What is the correct Postquel syntax for retrieving only rows which
have a null-value for a certain attribute?

I tried the obvious 'retrieve (test.all) where test.attr = NULL'
but this only crashed the backend...

Thanks in advance for any clues.

	Rainer
---
Rainer Staringer                   | rainer@fml.tuwien.ac.at
Financial Markets Lab, TU Vienna   | +43 (1) 58801/8138