Table: ahmad_yani_ships
Columns: class
ship_name
origin
hull_numbers
service_years
previously
note

Question: what is the maximum number of hull numbers?
SQL: SELECT MAX("hull_numbers") FROM ahmad_yani_ships

Question: who is the class where note is reportedly still active as of 2012?
SQL: SELECT "class" FROM ahmad_yani_ships WHERE "note" = 'Reportedly still active as of 2012'

Question: what is the maximum number of hull nunbers where ship name is kri yos sudarso?
SQL: SELECT MAX("hull_numbers") FROM ahmad_yani_ships WHERE "ship_name" = 'KRI Yos Sudarso'