CREATE TABLE table_name_94 (driver VARCHAR, constructor VARCHAR, entrant VARCHAR)

Who is the driver whose Constructor was Era, and whose entrant was T.A.S.O. Mathieson?
SELECT driver FROM table_name_94 WHERE constructor = "era" AND entrant = "t.a.s.o. mathieson"
SELECT "driver" FROM "table_name_94" WHERE "constructor" = "era" AND "entrant" = "t.a.s.o. mathieson"