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NULL saves disk space?

From: Phoenix Kiula <phoenix(dot)kiula(at)gmail(dot)com>
To: PG-General Mailing List <pgsql-general(at)postgresql(dot)org>
Subject: NULL saves disk space?
Date: 2011-04-27 16:24:13
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-general
Possibly a dumb question but there isn't much about this.

I have some BOOLEAN columns. 90% of the cases of the columns is FALSE. Do I
save disk space by having them as NULL instead of FALSE? So my application
would have conditional code for NULL and TRUE, instead of FALSE and TRUE.



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