Well, i tried all your sugestions, and i found some funny issues, i use the query to count exactly in a day by day basis, and running the query with
WHERE lastlogin >= '2009-05-01' AND lastlogin < '2009-05-03'
OR
WHERE lastlogin >= 'X' AND lastlogin <= 'Y' + '1 day'::interval
it includes the 0 hours of day 3:
05-02-2009 12:00:00 AM
The exact result are from running:
....between '2009-05-01 00:00'::timestamp
and '2009-05-02 23:59:59'::timestamp
but i select the ranges from a web form using a textbox, and right now i dont have a java calendar at hand, i tried this with good result:
WHERE lastlogin::date BETWEEN '2009-05-01' AND '2009-05-02'
But now the query uses seq scan and not the index in lastlogin column.
Is there another way?
On Wed, May 6, 2009 at 3:17 PM, Erik Jones
<ejones@engineyard.com> wrote:
On May 6, 2009, at 2:12 PM, Miguel Miranda wrote:
Hi, what is the recommended way to select a range of dates?
Lets say a have a table with a lastlogin (timestamp) column and i want toknow what users logged in for last time between 2009-05-01 and 2009-05-02?
I know that a simple
where lastlogin between '2009-05-01' and '2009-05-02' doesnt work beacuse it doesnt include who logged in 2009-05-02 15:30:00, etc...
or, if the values have are some unknown X and Y dates then you can do this:
WHERE lastlogin >= 'X' AND lastlogin <= 'Y' + '1 day'::interval
Erik Jones, Database Administrator
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