Adding weekdays to select statement - sql

Question

I have a select statement that pulls and consolidates data from multiple tables. I need to add additional logic to calculate the number of weekdays between the createdDt and CallEndDate (but if the callEndDate is null use the current date).
We are using SQL Server 2016 and am at a loss on how to incorporate this additional calculated logic with my select statement below. Any suggestions?
SELECT c.ID, c.CreatedDt, c.LastUpdatedDt, c.CALLSTARTDT, c.CALLENDDT, c.DUEDT,
c.TYPE, c.DESCRIPTION, c.COMMENT, c.CONTRACT, c.DISCLOSUREPTAN, c.DISCLOSURENPI, c.DISCLOSURETIN,
c.DISCLOSUREIVR, c.CALLERFIRSTNAME, c.CALLERLASTNAME, c.CALLERPHONE, c.CALLEREMAIL, c.STATUS,
c.STATUSQUALIFIER, c.RATING, u1.Name as LastUpdatedByName, u2.Name as CreatedByName,
u3.Name as OwnedByName, p.PTAN, p.NPI,p.NAME, con.LOB
FROM Case c
LEFT JOIN ossys_User u1 ON c.LastUpdatedBy = u1.Id
LEFT JOIN ossys_User u2 ON c.CreatedBy = u2.ID
LEFT JOIN ossys_User u3 ON c.OwnedBy = u3.Id
INNER JOIN PROVIDER p ON c.TargetId = p.Id
INNER JOIN CONTRACTS con ON p.Contract = con.Contract
WHERE
c.LastUpdatedDt BETWEEN '2019-01-01' AND '2019-07-01'
Order By c.CreatedDt ASC

Answer 1

Calculations can be included in your select statement as such:
SELECT c.ID, c.CreatedDt, c.LastUpdatedDt, c.CALLSTARTDT, c.CALLENDDT, c.DUEDT,
c.TYPE, c.DESCRIPTION, c.COMMENT, c.CONTRACT, c.DISCLOSUREPTAN,
c.DISCLOSURENPI,c.DISCLOSURETIN,c.DISCLOSUREIVR, c.CALLERFIRSTNAME, c.CALLERLASTNAME,
c.CALLERPHONE, c.CALLEREMAIL, c.STATUS, c.STATUSQUALIFIER, c.RATING,
u1.Name as LastUpdatedByName, u2.Name as CreatedByName,
u3.Name as OwnedByName,
p.PTAN, p.NPI,p.NAME,
con.LOB,
((DATEDIFF(dd, c.CreateDt, ISNULL(c.CALLENDDT,#GETDATE)) + 1)
-(DATEDIFF(wk, c.CreateDt, ISNULL(c.CALLENDDT,#GETDATE)) * 2)
-(CASE WHEN DATENAME(dw, c.CreateDt) = 'Sunday' THEN 1 ELSE 0 END)
-(CASE WHEN DATENAME(dw, ISNULL(c.CALLENDDT, #GETDATE)) = 'Saturday' THEN 1 ELSE 0 END))
As diff
FROM Case c
LEFT JOIN ossys_User u1 ON c.LastUpdatedBy = u1.Id
LEFT JOIN ossys_User u2 ON c.CreatedBy = u2.ID
LEFT JOIN ossys_User u3 ON c.OwnedBy = u3.Id
INNER JOIN PROVIDER p ON c.TargetId = p.Id
INNER JOIN CONTRACTS con ON p.Contract = con.Contract
WHERE
c.LastUpdatedDt BETWEEN '2019-01-01' AND '2019-07-01'
Order By c.CreatedDt ASC
Although I would more likely go with the solution defined by the link posted by #openshac and put that into a function before calling as such.
CREATE FUNCTION [dbo].fn_CountWeekDays
(
#fromdate Datetime,
#todate Datetime
)
RETURNS TABLE AS RETURN
(
SELECT
(DATEDIFF(dd, #fromdate, #todate) + 1)
-(DATEDIFF(wk, #fromdate, #todate) * 2)
-(CASE WHEN DATENAME(dw, #fromdate) = 'Sunday' THEN 1 ELSE 0 END)
-(CASE WHEN DATENAME(dw, #todate) = 'Saturday' THEN 1 ELSE 0 END)
As NoOfWeekDays
)
GO
SELECT c.ID, c.CreatedDt, c.LastUpdatedDt, c.CALLSTARTDT, c.CALLENDDT, c.DUEDT,
c.TYPE, c.DESCRIPTION, c.COMMENT, c.CONTRACT, c.DISCLOSUREPTAN,
c.DISCLOSURENPI,c.DISCLOSURETIN,c.DISCLOSUREIVR, c.CALLERFIRSTNAME, c.CALLERLASTNAME,
c.CALLERPHONE, c.CALLEREMAIL, c.STATUS, c.STATUSQUALIFIER, c.RATING,
u1.Name as LastUpdatedByName, u2.Name as CreatedByName,
u3.Name as OwnedByName,
p.PTAN, p.NPI,p.NAME,
con.LOB,
CountWeekDays(c.CreateDt, ISNULL(c.CALLENDDT,#GETDATE))
As diff
FROM Case c
LEFT JOIN ossys_User u1 ON c.LastUpdatedBy = u1.Id
LEFT JOIN ossys_User u2 ON c.CreatedBy = u2.ID
LEFT JOIN ossys_User u3 ON c.OwnedBy = u3.Id
INNER JOIN PROVIDER p ON c.TargetId = p.Id
INNER JOIN CONTRACTS con ON p.Contract = con.Contract
WHERE
c.LastUpdatedDt BETWEEN '2019-01-01' AND '2019-07-01'
Order By c.CreatedDt ASC