Re: Find Number Of Sundays Between Two Dates

am  Tue, dem 04.03.2008, um 22:16:07 -0800 mailte raghukumar folgendes:
>
> Hai EverBody,
>
>         Can I know what is the query by which we can find the number of
> sundays between two given dates in postgres

No problem, for instance for month january 2008:

test=*# select count(1) from
  (select '2008-01-01'::date + s*'1day'::interval as datum from
    generate_series(0,30) s)foo
  where extract(dow from datum)=6;
 count
-------
     4
(1 row)


With generate_series() i generate a list of dates, and later i check if
the date are a saturday. Okay, you need to know sunday -> change from 6
to 0 and ou course, you can calculate the parameter for the
generate_series like

test=*# select count(1) from
  (select '2008-01-01'::date + s*'1day'::interval as datum from
    generate_series(0,'2008-01-31'::date - '2008-01-01'::date) s)foo
  where extract(dow from datum)=0;
 count
-------
     4
(1 row)




Andreas
--
Andreas Kretschmer
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