CREATE TABLE table_57238 ("Round" FLOAT, "Grand Prix" TEXT, "Pole Position" TEXT, "Fastest Lap" TEXT, "Winning Driver" TEXT, "Winning Constructor" TEXT, "Report" TEXT)

What is the pole position of the Portuguese Grand Prix?
SELECT "Pole Position" FROM table_57238 WHERE "Grand Prix" = 'portuguese grand prix'
SELECT "Pole Position" FROM "table_57238" WHERE "Grand Prix" = 'portuguese grand prix'