text: create table if not exists country (name varchar(255) not null);
  create table if not exists state (name varchar(255) not null, country_code int not null);
  create table if not exists city (name varchar(255) not null, state_code int not null);
  
  insert into country (name) values ('India');
  insert into country (name) values ('Russia');
  insert into country (name) values ('USA');
  
  insert into state (name,country_code) values ('Maharashtra',1);
  insert into state (name,country_code) values ('Madhya Pradesh',1);
  insert into state (name,country_code) values ('Moscow',3);
  insert into state (name,country_code) values ('Something',4);
  insert into state (name,country_code) values ('Florida',4);
  insert into state (name,country_code) values ('Texas',4);
  
  insert into city (name,state_code) values('Mumbai',1);
  insert into city (name,state_code) values('Pune',1);
  insert into city (name,state_code) values('Bhopal',2);
  insert into city (name,state_code) values('Indore',2);
  insert into city (name,state_code) values('Klin',3);
  insert into city (name,state_code) values('Los Angeles',5);
  insert into city (name,state_code) values('Plant City',5);
  insert into city (name,state_code) values('Arlington',6);
  