Hi Begun ,
I am very eager to know the reason why 27th Nov is taken as the base for each
year. Can you please explain me the reasons. This query is really helpful for me .
Thanks & Regards,
Shankar
-----Original Message-----
Sent: Saturday, March 29, 2003 11:39 AM
To: Multiple recipients of list ORACLE-L
Hello!
Sesi Odury wrote:
> Given a week between (1 - 52) for a particular year can we get all the
> dates within that week. Is there a function to do this in SQL???
Using the simple statement below you can get the first date of the week
(according to ISO standard). Then you can either add 6 to get the last
day of the week and use ranges for your task or using any 'pivot'-approach
(you need 7 rows) you can get all 7 days/dates of the week.
DEFINE yr=1998
DEFINE wk=5
SELECT TRUNC(TO_DATE('2711&yr', 'DDMMYYYY'), 'IYYY') + (&wk - 1) * 7 AS date_from
, TRUNC(TO_DATE('2711&yr', 'DDMMYYYY'), 'IYYY') + (&wk - 1) * 7 + 6 AS date_to
FROM sys.dual
/
Ranges can be used in case one does not have a possibility to use FBI, for
example.
The statement below is a bit more complicated. This one does a simple
check and returns nothing in case week number is out of range.
DEFINE yr=1998
DEFINE wk=53
SELECT TRUNC(TO_DATE('2711&yr', 'DDMMYYYY'), 'IYYY') + (&wk - 1) * 7 AS date_from
, TRUNC(TO_DATE('2711&yr', 'DDMMYYYY'), 'IYYY') + (&wk - 1) * 7 + 6 AS date_to
FROM sys.dual
WHERE TO_NUMBER(
TO_CHAR(
TO_DATE('3112&yr', 'DDMMYYYY')
+ DECODE(TO_CHAR(TO_DATE('3112&yr', 'DDMMYYYY'), 'IW')
, '01', -7
, 0
)
, 'IW'
)
) >= &wk
AND &wk > 0
/
HTH[, if I did not make a mistake].
--
Vladimir Begun
The statements and opinions expressed here are my own and
do not necessarily represent those of Oracle Corporation.
--
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Author: Vladimir Begun
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