generate_series that's a good one!
Thank you!
On 7/3/07, Emi Lu <[EMAIL PROTECTED]> wrote:
Can I know how to get the date of each month's last Thursday please?
Query: select getDateBaseOnWeekday('2007-04-01', 'Last Thursday');
Result: 2007-04-26
you can easily do it without functions.
for example, this select:
SELECT
cast(d.date + i * '1 day'::interval as date)
FROM
(select '2007-04-01'::date as date) d,
generate_series(0, 30) i
WHERE
to_char(d.date, 'MM') = to_char( cast(d.date + i * '1 day'::interval as
date), 'MM')
AND to_char(cast(d.date + i * '1 day'::interval as date), 'D') = '5'
ORDER BY 1 DESC
LIMIT 1
;
does what you need.
to get last-thursday for another month, just change: (select
'2007-04-01'::date as date) d, to be 1st of any other month.
depesz
---------------------------(end of broadcast)---------------------------
TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
