> > > I see this as a greate feature. I would treat ranking functions without explicit order by clause as a feature rather than a bug. However, I believe, in most cases optimizer will avoid additional sort when possible, thus an "order by" in a windowing clause would not cause any performance degradation.
> > It will hopefully be possible to write: > > SELECT *, max(row_number()) over() as total_rows from employees; I believe this query does not make sense. At least, "row_number" without "over" sounds odd. To count all the rows (if you really want to) you might use "count(*) over ()". > > To get the maximum number of rows in a separate column. Very usefull when > writing queries to retrieve "paged" results. Like "Give me the 20 top > articles sorted on date and also the total number of articles" in *one* > query, eliminating the need for a separate count(*) query. Sometimes it is better to perform several separate queries since optimizer could use an index scan to get "20 top" and seq scan to get the "count(*)" Regards, Vladimir Sitnikov
