How can i find the 1st business day of the week ?

Question

Hi,
How can i find the 1st business day of the week excluding saturaday,sunday and holidays? i have holiday table which contains the columns name HolidayDate and HolidayDescription.
Ex:
10-1-2011 is monday(i.e) 1st business day.check If it is in holiday table,then return the result as 11-1-2011 else return the result as 11-1-2011(which is the first business day of this week).
Can anyone tell me the Query to solve it?

Answer 1

Does this help:
SQL> ed
Wrote file afiedt.buf
  1  with t as (SELECT TRUNC(SYSDATE,'IW') holiday FROM dual
  2  UNION SELECT TRUNC(SYSDATE + 7,'IW') from dual)
  3  SELECT MIN(Dat),wk FROM
  4  (SELECT TO_CHAR(dat,'IW') wk,dat FROM
  5  (SELECT dat + lvl dat FROM
  6  (SELECT TRUNC(SYSDATE,'RRRR') dat, level - 1 lvl
  7  FROM dual
  8  CONNECT BY level <= TO_DATE('31-DEC'||TO_CHAR(SYSDATE,'RRRR')) - TRUNC(SYSDATE,'RRRR'))
  9  ) x
10  WHERE x.dat NOT IN (select holiday from t))
11  WHERE TO_CHAR(Dat,'DY') <> 'SAT'
12  AND TO_CHAR(dat,'DY') <> 'SUN'
13* group by wk
SQL> /
MIN(DAT)  WK
04-JAN-11 01  -- since 03-JAN-2011 is in holiday list, 04 is taken as first business day of first week
11-JAN-11 02  -- similar to week 1
17-JAN-11 03
24-JAN-11 04
31-JAN-11 05
07-FEB-11 06
14-FEB-11 07
21-FEB-11 08
28-FEB-11 09
07-MAR-11 10
14-MAR-11 11
21-MAR-11 12
28-MAR-11 13
04-APR-11 14
11-APR-11 15
18-APR-11 16
25-APR-11 17
02-MAY-11 18
09-MAY-11 19
16-MAY-11 20
23-MAY-11 21
30-MAY-11 22
06-JUN-11 23
13-JUN-11 24
20-JUN-11 25
27-JUN-11 26
04-JUL-11 27
11-JUL-11 28
18-JUL-11 29
25-JUL-11 30
01-AUG-11 31
08-AUG-11 32
15-AUG-11 33
22-AUG-11 34
29-AUG-11 35
05-SEP-11 36
12-SEP-11 37
19-SEP-11 38
26-SEP-11 39
03-OCT-11 40
10-OCT-11 41
17-OCT-11 42
24-OCT-11 43
31-OCT-11 44
07-NOV-11 45
14-NOV-11 46
21-NOV-11 47
28-NOV-11 48
05-DEC-11 49
12-DEC-11 50
19-DEC-11 51
26-DEC-11 52
52 rows selected.
SQL>