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Best way to store a SET bigger than 64
Spain,France,Germany

create table countries (
  iso_country_code char(3) primary key,
  country_name varchar(50) not null unique
);

insert into countries (country_name, iso_country_code) values
('AALAND ISLANDS', 'ALA'),
('AFGHANISTAN', 'AFG'),
('ALBANIA', 'ALB'),
...
('YEMEN', 'YEM'),
('ZAMBIA', 'ZMB'),
('ZIMBABWE', 'ZWE');

create table some_other_table_that_references_countries (
  some_key ... primary key,
  iso_country_code char(3) not null references countries (iso_country_code),
  ...
);