geometric types

From: vandeurzen luc <lvdeurze(at)luc(dot)ac(dot)be>
To: pgsql-sql(at)postgresql(dot)org
Subject: geometric types
Date: 1998-10-29 14:03:23
Message-ID: 3.0.1.32.19981029140323.00946c90@alpha.luc.ac.be
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hi,

can someone explain me how to work with the built-in geometric types point,
polygon, box, and circle of postgres? How can you for instance select the
first coordinate of a point? How can you select the 2nd point of a polygon?

thanks.

luc.

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