Where can I find detail information about constraint ?

From: 纪晓曦 <sheepjxx(at)gmail(dot)com>
To: Postgres General Postgres General <pgsql-general(at)postgresql(dot)org>
Subject: Where can I find detail information about constraint ?
Date: 2009-09-23 10:23:19
Message-ID: 37a11ce00909230323p76cca9c6icbac6e6549b4950f@mail.gmail.com
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I want detail usage introduction about constraint,such as how to constrain a
string to be exactly 4 character and start with 'z'.Where can I find the
reference of CHECK? detail usage.

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