Are check constraints always evaluated on UPDATE?

From: bubba postgres <bubba(dot)postgres(at)gmail(dot)com>
To: pgsql-general(at)postgresql(dot)org
Subject: Are check constraints always evaluated on UPDATE?
Date: 2011-06-17 21:25:10
Message-ID: BANLkTim8FD8yBH8EUFZcJUe6VO90xX+HDQ@mail.gmail.com
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Are there any optimizations around check constraints such that they will not
be evaluated if constituent columns are not updated?

Regards,
-JD

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