Hi,
Have you already tried this out?
select MAX(page_count_count) - MIN(page_count_count)
from page_count
group by page_count_pdate.
Best,
Oliveiros
----- Original Message -----
From: "Wes James" <compte...@gmail.com>
To: <pgsql-sql@postgresql.org>
Sent: Wednesday, June 02, 2010 5:48 PM
Subject: [SQL] how to construct sql
I am grabbing a printer total and putting it in a table. The
page_count is continuously increasing:
page_count_count page_count_pdate
10 2010-05-10
20 2010-05-10
40 2010-05-11
60 2010-05-11
80 2010-05-11
100 2010-05-12
120 2010-05-12
.....
and so on.
I can do:
select sum(page_count_count) from page_count group by page_count_pdate.
and get a total for a day. But this is not the total I want. I want
the total page count for the day. This would mean getting the first
page count of the day and then subtracting that from last page_count
for the day. For 2010-05-11 above it would be
80 - 40 = 40 total for the day. Is there a way to do this with sql?
thx,
-wes
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