Qual é a média de ouro do atleta de inverno com 1 bronze, menos de 3 prata e menos de 4 medalhas totais?
CREATE TABLE table_name_64 (gold INTEGER, total VARCHAR, silver VARCHAR, bronze VARCHAR, type VARCHAR)
SELECT AVG(gold) FROM table_name_64 WHERE bronze = 1 AND type = "winter" AND silver < 3 AND total < 4