SELECT T1.name FROM Employee AS T1 JOIN Certificate AS T2 ON T1.eid  =  T2.eid JOIN Aircraft AS T3 ON T3.aid  =  T2.aid WHERE T3.name  =  "Boeing 737-800"
Show names for all employees who have certificate of Boeing 737-800.
[Schema (values) (types)]: | flight_1 |  flight : flno (text) , origin (number) , destination (text) , distance (text) , departure_date (number) , arrival_date (time) , price (time) , aid (number) | aircraft : aid (text) , name (number) , distance (text) | employee : eid (text) , name (number) , salary (text) | certificate : eid (text) , aid (number);