Day between two dates excluding Saturday and Sunday

Question

Hi,
I have the Requirement like : there are two inputs in query 1)startdate and 2)end date when end user enter the start date and end date the sql query has to retrive the number of days between given start and end dates, and it should be retrivied with two condition 1)all sundays between the above dates excluded 2)second and fourth Saturday of the month in between the start and end dates has to be excluded .
example start date:01-may-09
end date: 16-may-09
expected output:13

Answer 1

Balaji.M wrote:
Hope this will be helpful for you.
SELECT dates,
TO_CHAR(dates, 'D'),
TO_CHAR(dates, 'DAY'),
TO_CHAR(inner.dates, 'W')
FROM (SELECT TO_DATE('01-may-09') + LEVEL - 1 dates
FROM DUAL
CONNECT BY LEVEL <= (TO_DATE('16-may-09') - TO_DATE('01-may-09')) + 1) inner
WHERE ( ( TO_CHAR(inner.dates, 'D') = 7
AND TO_CHAR(inner.dates, 'W') NOT IN(2, 4)
OR TO_CHAR(inner.dates, 'D') not in (1,7)
You can replace the start date (two place) and end date (one place) by variables and check.Of course we have to be aware of local NLS settings:
SQL> SELECT dates,
  2  TO_CHAR(dates, 'D'),
  3  TO_CHAR(dates, 'DAY'),
  4  TO_CHAR(inner.dates, 'W')
  5  FROM (SELECT TO_DATE('01-may-09') + LEVEL - 1 dates
  6  FROM DUAL
  7  CONNECT BY LEVEL <= (TO_DATE('16-may-09') - TO_DATE('01-may-09')) + 1) inner
  8  WHERE ( ( TO_CHAR(inner.dates, 'D') = 7
  9  AND TO_CHAR(inner.dates, 'W') NOT IN(2, 4)
10  )
11  OR TO_CHAR(inner.dates, 'D') not in (1,7)
12  );
DATES     T TO_CHAR(D T
01-MAY-09 5 FRIDAY    1
02-MAY-09 6 SATURDAY  1
03-MAY-09 7 SUNDAY    1
05-MAY-09 2 TUESDAY   1
06-MAY-09 3 WEDNESDAY 1
07-MAY-09 4 THURSDAY  1
08-MAY-09 5 FRIDAY    2
09-MAY-09 6 SATURDAY  2
12-MAY-09 2 TUESDAY   2
13-MAY-09 3 WEDNESDAY 2
14-MAY-09 4 THURSDAY  2
15-MAY-09 5 FRIDAY    3
16-MAY-09 6 SATURDAY  3
13 rows selected.
SQL>Day 1 on my local database is Monday, not Sunday.