What is the first name and last name employee helps the customer with first name Leonie?
SELECT T2.FirstName ,  T2.LastName FROM CUSTOMER AS T1 JOIN EMPLOYEE AS T2 ON T1.SupportRepId  =  T2.EmployeeId WHERE T1.FirstName  =  "Leonie"
first name and last name of employee refers to T2.FirstName, T2.LastName; helps the customer refers to JOIN on EmployeeId = SupportRepId; customer with first name Leonie refers to T1.FirstName = 'Leonie';