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* pg 9.1beta3 typo in 7.2.3
@ 2011-07-15 08:41 Gavin Flower <GavinFlower@archidevsys.co.nz>
0 siblings, 1 reply; 2+ messages in thread
From: Gavin Flower @ 2011-07-15 08:41 UTC (permalink / raw)
To: pgsql-docs
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
^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: pg 9.1beta3 typo in 7.2.3
@ 2011-07-15 14:51 Tom Lane <tgl@sss.pgh.pa.us>
parent: Gavin Flower <GavinFlower@archidevsys.co.nz>
0 siblings, 0 replies; 2+ messages in thread
From: Tom Lane @ 2011-07-15 14:51 UTC (permalink / raw)
To: Gavin Flower <GavinFlower@archidevsys.co.nz>; +Cc: pgsql-docs
Gavin Flower <GavinFlower@archidevsys.co.nz> writes:
> I think that there is a typo in the paragraph: 'x' used instead of 'y'
> in 'GROUP BY'.
You're mistaken. However, possibly the example is a bit confusing,
because the point is that "SELECT *" includes y, which can't be validly
referenced. Maybe we should spell out "x, y" instead of writing "*".
regards, tom lane
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2011-07-15 08:41 pg 9.1beta3 typo in 7.2.3 Gavin Flower <GavinFlower@archidevsys.co.nz>
2011-07-15 14:51 ` Tom Lane <tgl@sss.pgh.pa.us>
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