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" INTERSECT 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  =  "Airbus A340-300"
Show names for all employees who have certificates on both Boeing 737-800 and Airbus A340-300.
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 '' INTERSECT 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 = `` Airbus A340-300 ''
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 = value intersect 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 = value
Show names for all employees who have certificates on both Boeing 737-800 and Airbus A340-300 .