Re: Nested window functions not permitted

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Oliver Elphick <olly(at)lfix(dot)co(dot)uk>
Cc: pgsql-general(at)postgresql(dot)org
Subject: Re: Nested window functions not permitted
Date: 2015-11-08 22:50:12
Message-ID: 9838.1447023012@sss.pgh.pa.us
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-general

Oliver Elphick <olly(at)lfix(dot)co(dot)uk> writes:
> I tried to do this:
> SELECT p.company, p.start, p.yearend, p.idnum,
> s.pdno, s.pdend,
> CASE WHEN nth_value(s.pdend,(row_number() OVER w)::INTEGER -1) OVER w IS NULL
> THEN p.start
> ELSE nth_value(s.pdend,(row_number() OVER w)::INTEGER -1) + '1 day'::INTERVAL

Um, don't you just want lead() or lag()?

regards, tom lane

In response to

Responses

Browse pgsql-general by date

  From Date Subject
Next Message Oliver Elphick 2015-11-08 22:51:47 Re: Nested window functions not permitted
Previous Message Oliver Elphick 2015-11-08 22:37:39 Nested window functions not permitted