SELECT MIN(assets__us) AS $_billion_ FROM table_name_16 WHERE company = "piraeus bank" AND revenues__us$_billion_ < 3.9
Apa aset terkecil dengan perusahaan Piraeus Bank, dan pendapatan (US $ miliar) lebih kecil dari 3,9?
CREATE TABLE table_name_16 (assets__us INTEGER, company VARCHAR, revenues__us$_billion_ VARCHAR)