Table: weapon_info
Columns: name_designation
year_of_intro
country_of_origin
primary_cartridge
major_users

Question: Who are all the major users of the Gordon Close-Support Weapon System?
SQL: SELECT "major_users" FROM weapon_info WHERE "name_designation" = 'Gordon Close-Support Weapon System'

Question: What country made the Flieger-Doppelpistole 1919?
SQL: SELECT "country_of_origin" FROM weapon_info WHERE "name_designation" = 'Flieger-Doppelpistole 1919'

Question: How many years of introduction does the Neal Submachine Gun have?
SQL: SELECT COUNT("year_of_intro") FROM weapon_info WHERE "name_designation" = 'Neal submachine gun'

Question: Who are the major users from Australia?
SQL: SELECT "major_users" FROM weapon_info WHERE "country_of_origin" = 'Australia'

Question: Who are all the major users of the Saturn Machine Pistol?
SQL: SELECT "major_users" FROM weapon_info WHERE "name_designation" = 'Saturn machine pistol'