constraint

From: Bernie Huang <bernie(dot)huang(at)ec(dot)gc(dot)ca>
To: PGSQL-SQL <pgsql-sql(at)postgresql(dot)org>
Subject: constraint
Date: 2000-05-29 17:22:05
Message-ID: 3932A73C.6FF32AAB@ec.gc.ca
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Hi,

I am a newbie to SQL. Could someone please explain why do I need a
contraint, and how do I use it in SQL? An example is needed. Thanks

- Bernie

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