CREATE TABLE table_68127 ("Year" FLOAT, "Entrant" CLOB, "Chassis" CLOB, "Engine" CLOB, "Points" FLOAT)

Which year had a Cosworth V8 engine and 12 points?
SELECT "Year" FROM table_68127 WHERE "Points" = '12' AND "Engine" = 'cosworth v8'
SELECT "Year" FROM "table_68127" WHERE "Engine" = 'cosworth v8' AND "Points" = '12'