Message-ID: <4E1FFD3B.5090708@archidevsys.co.nz>
Date: Fri, 15 Jul 2011 20:41:31 +1200
From: Gavin Flower <GavinFlower@archidevsys.co.nz>
Organization: ArchiDevSys
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To: pgsql-docs@postgresql.org
Subject: pg 9.1beta3 typo in 7.2.3
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I think that there is a typo in the paragraph: 'x' used instead of 'y' 
in 'GROUP BY'.

postgres-9.1beta3/share/doc/html/queries-table-expressions.html


7.2.3. The GROUP BY and HAVING Clauses
[...]
=> SELECT x FROM test1 GROUP BY x;
  x
---
  a
  b
  c
(3 rows)

In the second query, we could not have written SELECT * FROM test1 GROUP 
BY x, because there is no single value for the column y that could be 
associated with each group. The grouped-by columns can be referenced in 
the select list since they have a single value in each group.
[...]

The paragraph should read "...SELECT * FROM test1 GROUP BY y..."


Cheers,
Gavin