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Get Number of Holidays between two dates

I made a table with all our holiday days
SELECT     COUNT(ID) AS NumberOfHolidays
FROM         Holidays
WHERE     (HolidayDate > { fn NOW() })

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I have a table with Projects and each has a different end date.  I want to use the dataset but instead of it doing > Now I want it to be Between Now() and EndDate.  I can't use a parameter because it changes for each row (unless someone knows how to change the value of a parameter for each row of a table).  I thought I could use a variable but I'm not sure how to do that either.  I wanted to use it like a Lookup but it's not working out as well as I hoped.  If I could put it in my function that would be even better because I'm passing the start and end dates to it.

Function getBusinessDaysCount(ByVal tFrom As Date, ByVal tTo As Date) As Integer 
Dim tCount As Integer
Dim tProcessDate As Date = tFrom 
For x as Integer= 1 To DateDiff(DateInterval.Day, tFrom, tTo) + 1 
If Not (tProcessDate.DayOfWeek = DayOfWeek.Saturday Or tProcessDate.DayOfWeek = DayOfWeek.Sunday) Then tCount = tCount + 1
tProcessDate = DateAdd(DateInterval.Day, 1, tProcessDate) 
Next 
Return tCount 
End Function

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I got that code off the internet.  It successfully removes Saturdays and Sundays but I need to account for stat holidays as well as mandatory vacation days (which I have put into a Holidays table).  

I can't do the calculation in my initial query because I have to grab the EndDate from a separate table and it's a varchar.
 ISNULL((SELECT     CONVERT(datetime, CltCustValue, 101) AS Expr1
                              FROM         CltCustom
                              WHERE     (CltCustCltId = Clients.ID)), 0) AS E_End_Date

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Any suggestions are greatly appreciated!!!!
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HSI_guelph
Asked:
HSI_guelph
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1 Solution
 
Jim HornMicrosoft SQL Server Developer, Architect, and AuthorCommented:
< On a conference call, so this comment is a 'drive by'.  Sorry. >

Here's an article on How to build your own calendar table to pull that off.   The reason this is a custom dang deal is that holidays are not something that can be determined using available SQL Server functions.
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HSI_guelphAuthor Commented:
@Jim Horn - I've seen that article but I already have a table with all the dates in it so I'm not sure how that can help with my current table.  
Holiday table
Plus I need to grab this for each row and each row has a different end date.
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SharathData EngineerCommented:
Check if this works
SELECT *, 
       (SELECT COUNT(ID) 
          FROM Holidays 
         WHERE HolidayDate > GETDATE() 
               AND HolidayDate < t1.CltCustValue) AS NumberOfHolidays 
  FROM CltCustom t1 

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Otherwise post some sample data from your tables and expected result.
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HSI_guelphAuthor Commented:
Changed it up to
(SELECT     COUNT(ID) AS NumberOfHolidays
                            FROM          Holidays
                            WHERE      (HolidayDate BETWEEN { fn NOW() } AND CltCustom_1.CltCustValue)) AS HolidayDays
and worked like a charm.  It gives me the days I need to subtract from the Business Days and all calculations are working well now.
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