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Are check constraints always evaluated on UPDATE?

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To: pgsql-general@xxxxxxxxxxxxxx
Subject: Are check constraints always evaluated on UPDATE?
From: bubba postgres <bubba.postgres@xxxxxxxxx>
Date: Fri, 17 Jun 2011 14:25:10 -0700

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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