Question: How many people were there in the Engineering Department in the year 2009?
SQL: SELECT COUNT(T1.BusinessEntityID) FROM Person AS T1 INNER JOIN EmployeeDepartmentHistory AS T2 ON T1.BusinessEntityID = T2.BusinessEntityID INNER JOIN Department AS T3 ON T2.DepartmentID = T3.DepartmentID WHERE T3.Name = 'Engineering' AND STRFTIME('%Y', T2.EndDate) > '2009' AND STRFTIME('%Y', T2.StartDate) < '2009'