CREATE TABLE table_3642 ("Round" FLOAT, "Date" TEXT, "Grand Prix" TEXT, "Circuit" TEXT, "MotoGP winner" TEXT, "Moto2 winner" TEXT, "125cc winner" TEXT, "Report" TEXT)

Who are all the motogp winners when the circuit was Catalunya?
SELECT "MotoGP winner" FROM table_3642 WHERE "Circuit" = 'Catalunya'
SELECT "MotoGP winner" FROM "table_3642" WHERE "Circuit" = 'Catalunya'