Get all Iso Weeks when an employee had at least 5 days holliday

Question

Hi all,
I'm trying to query to get all Iso Weeks (Calendar weeks) when an employee had at least 5 days hollidays.
select HOLLIDAY_FROM,HOLLIDAY_TILL,to_char(HOLLIDAY_FROM,'iw') from_week,to_char(HOLLIDAY_TILL,'iw') till_week from HOLLIDAY;
HOLLIDAY_FROM HOLLIDAY_TILL FR TI
12-SEP-11 26-SEP-11 37 39
In this example an employee had holliday from Monday in the week # 37 till Monday in the week # 39.
So I would need to get the weeks 37 and 38 as a result, because in this weeks the employee had 5 days hollidays (saturday and sunday are weekend and are not counted)
Any help would be appreciated!

Answer 1

It looks like I misunderstood your question. To get IW weeks where all 5 weekdays were holidays/vacation use:
SELECT  TO_CHAR(HOLLIDAY_FROM + LEVEL - 1,'IW') week
  FROM  HOLLIDAY
  WHERE TO_CHAR(HOLLIDAY_FROM + LEVEL - 1,'DY','NLS_DATE_LANGUAGE=ENGLISH') NOT IN (
                                                                                    'SAT',
                                                                                    'SUN'
  CONNECT BY HOLLIDAY_FROM + LEVEL - 1 <= HOLLIDAY_TILL
  GROUP BY TO_CHAR(HOLLIDAY_FROM + LEVEL - 1,'IW')
  HAVING COUNT(*) = 5
/Based on your example:
WITH HOLLIDAY AS (
                  SELECT DATE '2011-09-12' HOLLIDAY_FROM, DATE '2011-09-26' HOLLIDAY_TILL FROM DUAL
-- end of on-the-fly data sample
SELECT  TO_CHAR(HOLLIDAY_FROM + LEVEL - 1,'IW') week
  FROM  HOLLIDAY
  WHERE TO_CHAR(HOLLIDAY_FROM + LEVEL - 1,'DY','NLS_DATE_LANGUAGE=ENGLISH') NOT IN (
                                                                                    'SAT',
                                                                                    'SUN'
  CONNECT BY HOLLIDAY_FROM + LEVEL - 1 <= HOLLIDAY_TILL
  GROUP BY TO_CHAR(HOLLIDAY_FROM + LEVEL - 1,'IW')
  HAVING COUNT(*) = 5
WE
37
38
SQL> SY.
Edited by: Solomon Yakobson on Sep 19, 2011 12:14 PM