Friday, February 25, 2011, 12:53:08 AM you wrote:
> select distinct on (a, b, c)
> a, b c, time_stamp, value
Without the comma, you declare 'b AS c'
> from data
> order by a, b, c, time_stamp desc;
> The output produced is the same as this query:
> select distinct on (a, b)
> a, b, time_stamp, value
> from data
> order by a, b, time_stamp desc;
the 'c' is optimized away, since it is an alias for b, and thus redundant
for the distinct.
> Not sure if this is considered a parser bug or not, but it feels slightly
> odd not to get an error.
No error, just plain SQL :-)
--
Jochen Erwied | home: jochen@erwied.eu +49-208-38800-18, FAX: -19
Sauerbruchstr. 17 | work: joe@mbs-software.de +49-2151-7294-24, FAX: -50
D-45470 Muelheim | mobile: jochen.erwied@vodafone.de +49-173-5404164
