From: Bruce Momjian <maillist@candle.pha.pa.us>
Message-Id: <199903190221.VAA13530@candle.pha.pa.us>
Subject: UNION docs
To: lockhart@alumni.caltech.edu (Thomas G. Lockhart)
Date: Thu, 18 Mar 1999 21:21:03 -0500 (EST)
Cc: docs@postgresql.org (PostgreSQL-documentation)
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I't unnI don't understand this:

    The UNION operator specifies a table derived from a Cartesian product.
    The two tables that represent the direct operands of the UNION must
    have the same number of columns, and corresponding columns must be
    of compatible data types.</para>
    
Why do you call it a cartesian product.  I thought a cartesian product
was tableA x tableB, while UNION is really tableA + tableB, right?

If I am right, can you change the docs?  I will leave it as is.  Thanks.

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