On 29 Apr 2010, at 10:01, Magnus Hagander wrote:
select extract(year from signup_date),
count(email_address),
sum(count(email_address)) over (partition by 1 order by 1 asc rows unbounded preceding)
from email_list group by 1 order by 1;
Does anyone have any other ideas?
Aren't you looking for something along the line of:
SELECT year, sum(c) over (order by year)
FROM (
SELECT extract(year from signup_date) AS year, count(email_address) AS c
FROM email_list
GROUP BY extract(year from signup_date)
)
(adjust for typos, I didn't test it)
Yes that does work thanks, if you give the subquery a name. I'd still like to know if it's possible to do with a window function rather than a subquery.
Oliver Kohll