CREATE TABLE table_68638 ("Year" FLOAT, "Entrant" TEXT, "Chassis" TEXT, "Engine" TEXT, "Points" FLOAT)

Who has 0 points in 1974?
SELECT "Entrant" FROM table_68638 WHERE "Points" = '0' AND "Year" = '1974'
SELECT "Entrant" FROM "table_68638" WHERE "Points" = '0' AND "Year" = '1974'