How to use function PointN?

From: "Nemo Terry" <ntuser155(at)hotmail(dot)com>
To: pgsql-sql(at)postgresql(dot)org
Subject: How to use function PointN?
Date: 2007-05-07 08:07:00
Message-ID: BAY19-F26CCC320397172DE70B66F5450@phx.gbl
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select PointN(envelope(polyline),1) from highway;
return null,why?

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