CREATE TABLE table_name_42 (league NUMBER, total VARCHAR2, name VARCHAR2)

Which league has total smaller than 284, with Sandro Mazzola league?
SELECT MIN(league) FROM table_name_42 WHERE total < 284 AND name = "sandro mazzola"
SELECT MIN("league") FROM "table_name_42" WHERE "name" = "sandro mazzola" AND "total" < 284