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One possible answer:
CREATE FUNCTION fnRegion(@FirstDate DATE,@LastDate DATE)
RETURNS INT
AS
BEGIN
DECLARE @Date_Diff INT
SELECT @Date_Diff=DateDIff(day,@FirstDate,ISNULL(@LastDate,Getdate()))
RETURN @Date_Diff
END
***************************************************************************************************************************
select DoctorName,dbo.fnRegion(FirstEpisodeDate,LastEpisodeDate)[Reign in days] from tblDoctor
****************************************************************************************************************************
Kingsmoor House
Railway Street
GLOSSOP
SK13 2AA
Landmark Offices
99 Bishopsgate
LONDON
EC2M 3XD
Holiday Inn
25 Aytoun Street
MANCHESTER
M1 3AE
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