| From: | Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | lockhart(at)alumni(dot)caltech(dot)edu (Thomas G(dot) Lockhart) |
| Cc: | docs(at)postgresql(dot)org (PostgreSQL-documentation) |
| Subject: | UNION docs |
| Date: | 1999-03-19 02:21:03 |
| Message-ID: | 199903190221.VAA13530@candle.pha.pa.us |
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| Lists: | pgsql-docs |
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.
--
Bruce Momjian | http://www.op.net/~candle
maillist(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
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