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Question About UNION - Mailing list pgsql-general

From Bill Thoen
Subject Question About UNION
Date
Msg-id 48EE330B.20106@gisnet.com
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Responses Re: Question About UNION  (Raymond O'Donnell <rod@iol.ie>)
List pgsql-general
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I'm trying to combine two tables, but I only want unique records based
on the first two columns. Can UNION be used to join three-column tables
but only include records based on the uniqueness of the first two
columns? If not, how would I do this with PostgreSQL 8.1?

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