| From: | "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com> |
|---|---|
| To: | David Rowley <dgrowleyml(at)gmail(dot)com> |
| Cc: | Corey Huinker <corey(dot)huinker(at)gmail(dot)com>, Greg Stark <stark(at)mit(dot)edu>, Andy Fan <zhihui(dot)fan1213(at)gmail(dot)com>, Zhihong Yu <zyu(at)yugabyte(dot)com>, PostgreSQL Developers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Window Function "Run Conditions" |
| Date: | 2022-03-23 05:09:27 |
| Message-ID: | CAKFQuwYwoqT06QGr5kEpCbCfKG9LZ1bDKuuwOVwxrU1aOi4LUA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Tue, Mar 22, 2022 at 3:39 PM David Rowley <dgrowleyml(at)gmail(dot)com> wrote:
> On Thu, 17 Mar 2022 at 17:04, Corey Huinker <corey(dot)huinker(at)gmail(dot)com>
> wrote:
> > It seems like this effort would aid in implementing what some other
> databases implement via the QUALIFY clause, which is to window functions
> what HAVING is to aggregate functions.
> > example:
> https://cloud.google.com/bigquery/docs/reference/standard-sql/query-syntax#qualify_clause
>
> Isn't that just syntactic sugar? You could get the same from adding a
> subquery where a WHERE clause to filter rows evaluated after the
> window clause.
>
>
I'd like some of that syntactic sugar please. It goes nicely with my
HAVING syntactic coffee.
David J.
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