Reg : subtracting weekoff day from the time difference

Question

Hi ,
I have query where I am getting time difference first of all in terms of hours as:
DECLARE @L_TIME_DIFF   INT
SET @L_TIME_DIFF= (DATEDIFF(hh, '05/09/2014', '05/12/2014'))
i.e. subtracting 12th may - 9th may and getting diff in hours ..in this case it will be 3*24 = 72 hours
All fine till here. Now next step I need to subtract from this 72 hours if falling any week off day. It can be Friday, it can be Saturday, or Sunday, or Half day Saturday, or Half Day Sunday, or Full 2 days Saturday/Sunday  .
The above scenario is decided based on one table [CALENDER_WORKINGDAYS] which looks like below :
CAL_WORKING_DAY 
CAL_AM
CAL_PM
CAL_SEQ_NO
Monday
1
1
1
Tuesday
1
1
2
Wednesday
1
1
3
Thursday
1
1
4
Friday
0
0
5
Saturday
1
1
6
Sunday
1
1
7
So in this case, if you look at friday (CAL_AM=0 and CAL_PM=0) this measn friday full day holiday for some country.
Hence I need to : 72 - 24 = 48 Hours should be my output.
In another scenario, let s say some country work half day Saturday and Sunday full day off.
So my output should be : 72 - 36 (because 24 hours for sunday off, and 12 hours for saturday half day off) =
36 should be my output
and so on..
Can you help to build such query based on the above table given ?
Thanks

Answer 1

Hi Jose Diz,
I am trying the below logic. Seems it should be working:
DECLARE
@L_START_TIME    DATETIME,          
@L_END_TIME    DATETIME,
@L_TIME_DIFF   INT, -- Time Difference considering week offs          
@W_TIME_DIFF   INT ,-- Whole Time Difference,
@PUBLICHOLS   INT,
@WEEK_OFF INT
set @L_START_TIME    = '5/9/2014';
set @L_END_TIME    = '5/12/2014';
/* TO GET THE TIMDIFFERENCE */          
  SET @L_TIME_DIFF=(DATEDIFF(hh,@L_START_TIME,@L_END_TIME))          
  SET @W_TIME_DIFF = @L_TIME_DIFF          
-- Subtracting day off in the week(i.e. sat/sun or in some case friday) if it is in between start and end
  set @WEEK_OFF= 0;
    SELECT @WEEK_OFF= @WEEK_OFF + 12 * (abs(CAL_AM -1) + abs(CAL_PM -1))
    from CALENDER_WORKINGDAYS
 IF DATENAME(WK,@L_END_TIME) > DATENAME(WK,@L_START_TIME)           
 BEGIN          
  SET @L_TIME_DIFF= @L_TIME_DIFF - @WEEK_OFF          
 END          
Thanks to confirm