Question: List the name of employees who had left the company? When were they hired?
SQL: SELECT T1.FirstName, T1.LastName, T2.HireDate FROM Person AS T1 INNER JOIN Employee AS T2 ON T1.BusinessEntityID = T2.BusinessEntityID INNER JOIN EmployeeDepartmentHistory AS T3 ON T2.BusinessEntityID = T3.BusinessEntityID WHERE T3.EndDate IS NOT NULL