From: | Jack Douglas <jack(at)douglastechnology(dot)co(dot)uk> |
---|---|
To: | pgsql-docs(at)postgresql(dot)org |
Subject: | boolean states |
Date: | 2011-04-27 08:46:27 |
Message-ID: | 4DB7D7E3.6010403@douglastechnology.co.uk |
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Lists: | pgsql-docs |
Hi
http://www.postgresql.org/docs/current/static/datatype-boolean.html states:
The boolean type can have one of only two states: "true" or
"false". A third state, "unknown", is represented by the SQL null value.
This sounds like an oxymoron to me. Perhaps that sentence should be
changed to:
The boolean type can have one of three states: "true" or
"false" and "unknown". The third state, "unknown", is represented by the
SQL null value.
or:
The boolean type can have one of three states: "true" or
"false" and null. The third state, null, represents the logical value
"unknown".
Best regards
Jack Douglas
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