new data types

From: Alexander Cohen <alex(at)toomuchspace(dot)com>
To: Postgres General <pgsql-general(at)postgresql(dot)org>
Subject: new data types
Date: 2004-11-09 19:20:23
Message-ID: 677FDC0D-3284-11D9-AE74-000A95B947DC@toomuchspace.com
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When i write code in C to create the functions that define a new data
type, how can i set a value so that the user sees a null value from
sql.

thanks

Alex

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