Salvador =?iso-8859-1?Q?Main=E9?= <[EMAIL PROTECTED]> writes:
> I want to select the the day of maximum value for each year for a given
> measurement station.
This is exactly the sort of thing that SELECT DISTINCT ON is meant for.
See the "weatherReports" example in the SELECT man page,
http://www.postgresql.org/devel-corner/docs/postgres/sql-select.html
regards, tom lane
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