What is the job title of the oldest employee in the company? In which department is he in?
oldest employee refers to min(BirthDate)
SELECT T2.JobTitle, T4.Name FROM Person AS T1 INNER JOIN Employee AS T2 ON T1.BusinessEntityID = T2.BusinessEntityID INNER JOIN EmployeeDepartmentHistory AS T3 ON T2.BusinessEntityID = T3.BusinessEntityID INNER JOIN Department AS T4 ON T3.DepartmentID = T4.DepartmentID ORDER BY T2.HireDate LIMIT 1