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User Defined Function

Last Modified: 2015-07-04
I need to create a function which will return an average of Vacation hours based on Gender.I have written the following code:
CREATE FUNCTION fx_avgVacationHours
(@Gender varchar(50))
Returns int
SELECT  AVG (VacationHours)
  FROM HumanResources.Employee
where Gender=@Gender

Select dbo.fx_avgVacationHours(2)

But this code is returning me a NULL value.
Please let me know what wrong i am doing here.
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