show all record between two date after group by and aggrigation...
i am fatching record's from data base between two date range for
registration_date coloum and than group by an count it using
count(registration_date) i have to show all dates even if date is not there
in registration_date ,it should show date and 0 in count.,how can i do it
plz healp.......
On 1/22/07, deepak pal <deepak.05pal@gmail.com> wrote:
i am fatching record's from data base between two date range for
registration_date coloum and than group by an count it using
count(registration_date) i have to show all dates even if date is not there
in registration_date ,it should show date and 0 in count.,how can i do it
plz healp.......
Most people do this with a "calendar" table, worst case is you could use
generate_series to do it (but it's ugly, and it may not scale well --
haven't tested it) and left join it to your data table.
select cal.date, coalesce(foo.x, 0) AS x
from (select (date_trunc('day', current_timestamp) + (s.s * interval '1
day'))::date AS date
from generate_series(1,365) AS s) AS cal
left join foo ON cal.date = foo.create_date;
date | x
------------+----
2007-01-23 | 1
2007-01-24 | 0
2007-01-25 | 2
2007-01-26 | 3
2007-01-27 | 0
2007-01-28 | 4
2007-01-29 | 5
2007-01-30 | 0
2007-01-31 | 6
2007-02-01 | 0
2007-02-02 | 7
2007-02-03 | 8
2007-02-04 | 0
2007-02-05 | 9
2007-02-06 | 0
2007-02-07 | 10
2007-02-08 | 0
2007-02-09 | 11
2007-02-10 | 0
2007-02-11 | 12
2007-02-12 | 0
2007-02-13 | 13
2007-02-14 | 0
"Chad Wagner" <chad.wagner@gmail.com> writes:
Most people do this with a "calendar" table, worst case is you could use
generate_series to do it (but it's ugly, and it may not scale well --
haven't tested it) and left join it to your data table.select cal.date, coalesce(foo.x, 0) AS x
from (select (date_trunc('day', current_timestamp) + (s.s * interval '1
day'))::date AS date
from generate_series(1,365) AS s) AS cal
left join foo ON cal.date = foo.create_date;
Why not, for the date part, the simpler alternative:
SELECT CURRENT_DATE + s.s AS DATE FROM generate_series(1, 365) AS s;
?
Be seeing you,
--
Jorge Godoy <jgodoy@gmail.com>
On 1/23/07, Jorge Godoy <jgodoy@gmail.com> wrote:
select cal.date, coalesce(foo.x, 0) AS x
from (select (date_trunc('day', current_timestamp) + (s.s * interval '1
day'))::date AS date
from generate_series(1,365) AS s) AS cal
left join foo ON cal.date = foo.create_date;Why not, for the date part, the simpler alternative:
SELECT CURRENT_DATE + s.s AS DATE FROM generate_series(1, 365) AS s;
That's one of the problems with having a couple dozen date/time functions
;).