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From: Nemo Terry <ntuser155@hotmail.com>
To: pgsql-sql@postgresql.org
Subject: How to use function PointN?
Date: Mon, 07 May 2007 16:07:00 +0800
Message-ID: <BAY19-F26CCC320397172DE70B66F5450@phx.gbl> (raw)

select PointN(envelope(polyline),1) from highway;
return null,why?

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