true, didn't test it that thoroughly: mod 7 should be bit more beautiful
select date_trunc('month',now()) + ( ((8 - extract('dow' from
date_trunc('month',now()))%7) ||'days')::text)::interval;
On 06.06.2007, at 18:54, Osvaldo Rosario Kussama wrote:
Kristo Kaiv escreveu:
oneliner:
select date_trunc('month',now()) + ((8 - extract('dow' from
date_trunc('month',now()))||'days')::text)::interval;
There is a problem when first monday is 1st or 2nd day of month.
bdteste=# SELECT date_trunc('month',meses) + ((8 - extract('dow'
from date_trunc ('month',meses))||'days')::text)::interval FROM
(SELECT ('2007-' || s.a || '-15')::timestamp as meses FROM
generate_series(1,12) as s(a)) AS foo;
?column?
---------------------
2007-01-08 00:00:00
2007-02-05 00:00:00
2007-03-05 00:00:00
2007-04-09 00:00:00
2007-05-07 00:00:00
2007-06-04 00:00:00
2007-07-09 00:00:00
2007-08-06 00:00:00
2007-09-03 00:00:00
2007-10-08 00:00:00
2007-11-05 00:00:00
2007-12-03 00:00:00
(12 registros)
Testing this condition we have the correct answer:
bdteste=# SELECT date_trunc('month',foo) + ((CASE WHEN extract
('dow' from date_trunc('month',foo)) > 1 THEN 8 ELSE 1 END) -
extract('dow' from date_trunc ('month',foo)))*'1 day'::interval
FROM (SELECT ('2007-' || s.a || '-15')::timestamp as foo FROM
generate_series(1,12) as s(a)) AS bar;
?column?
---------------------
2007-01-01 00:00:00
2007-02-05 00:00:00
2007-03-05 00:00:00
2007-04-02 00:00:00
2007-05-07 00:00:00
2007-06-04 00:00:00
2007-07-02 00:00:00
2007-08-06 00:00:00
2007-09-03 00:00:00
2007-10-01 00:00:00
2007-11-05 00:00:00
2007-12-03 00:00:00
(12 registros)
[]s
Osvaldo
