How to check: is some key referenced from sometable

From: evl(at)my-mail(dot)com(dot)ua
To: <pgsql-sql(at)postgresql(dot)org>
Subject: How to check: is some key referenced from sometable
Date: 2003-08-04 08:17:56
Message-ID: 3159.195.5.48.107.1059985076.squirrel@my-mail.com.ua
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Please help.

Need a boolean function which returns true if given key in table is
referensed from another table(s).

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see You again when ...
eVl

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