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 Number of Holidays Logic!
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Yak Posting Veteran

Saudi Arabia
83 Posts

Posted - 10/05/2012 :  16:18:02  Show Profile  Reply with Quote
Dear All,

I have a table tAuxCalendarDates with the following columns:

Date datetime NOT NULL,
IsHoliday bit NOT NULL

tAuxCalendarDates has all the dates as per calendar and Fridays are marked as Holiday(IsHoliday is set to 1) as follows:

279----- 2012-10-05----- 1
280----- 2012-10-06----- 0
281----- 2012-10-07----- 0
282----- 2012-10-08----- 0
283----- 2012-10-09----- 0
284----- 2012-10-10----- 0
285----- 2012-10-11----- 0
286----- 2012-10-12----- 1

Now my requirement is to calculate number of holidays
between @StartDate and @EndDate and add it to the @EndDate,but the new @EndDate should not be makred as Holiday i.e, IsHoliday=1.

For Example:
declare @StartDate datetime
declare @EndDate datetime

set @StartDate=GETDATE() --(2012-10-05)
set @EndDate=GETDATE()+6 --(2012-10-11)

select @ActualHolidays = count(1) from tAuxCalendarDates where Date between @StartDate and @EndDate and IsHoliday=1

So i will get new @EndDate as follows:
set @EndDate = @EndDate + @ActualHolidays -- which will be (2012-10-12 FRIDAY, IsHoliday=1)

Note 1 : Only Fridays are not holidays any date can be marked as Holiday(Festivals, Govermnent Holidays).

Note 2 : I can achieve this using a while loop, but performance is my concern.


Bustaz Kool
Flowing Fount of Yak Knowledge

1834 Posts

Posted - 10/05/2012 :  17:48:22  Show Profile  Reply with Quote
It should be doable to calculate the simple end date and then find the first (minimum) non-holiday that comes on or after that date. Something along the lines of:
;with cteSimpleEndDate
as select 
 <calculate simpleEndDate>
   Calendar c1 (blah, blah, blah)
select min(c.MyDate)
from Calendar c
inner join cteSimpleEndDate sed
   on c.MyDate >= sed.SimpleEndDate
   c.IsHoliday = 0

We are far more concerned about the desecration of the flag than we are about the desecration of our land. -Wendell Berry
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Flowing Fount of Yak Knowledge

4614 Posts

Posted - 10/05/2012 :  17:48:49  Show Profile  Reply with Quote
In your example, what do you want for output 2012-10-13?
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Yak Posting Veteran

Saudi Arabia
83 Posts

Posted - 10/05/2012 :  17:52:51  Show Profile  Reply with Quote
Thanks Bustaz Kool, I will check and will get back to you.

Yes Lamprey, I want the output to be 2012-10-13

Edited by - amodi on 10/05/2012 17:53:19
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