text: -- migrate:up
  
  CREATE TABLE 'students' (
  	'id'	INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
    'code'	INTEGER NOT NULL,
  	'names'	VARCHAR(50) NOT NULL,
    'last_names'	VARCHAR(50) NOT NULL,
    'email'	VARCHAR(50),
    'personal_email'	VARCHAR(50),
    'tw_user' VARCHAR(25),
    'tw_pass' VARCHAR(25),
    'ad_user' VARCHAR(25),
    'gender_id'	INTEGER,
    'carrer_id'	INTEGER,
    'country_id'	INTEGER,
    'photo_url' VARCHAR(100),
    FOREIGN KEY(`gender_id`) REFERENCES 'genders' ( 'id' ) ON DELETE CASCADE,
    FOREIGN KEY(`carrer_id`) REFERENCES 'carrers' ( 'id' ) ON DELETE CASCADE,
    FOREIGN KEY(`country_id`) REFERENCES 'countries' ( 'id' ) ON DELETE CASCADE
  );
  
  -- migrate:down
  
  DROP TABLE IF EXISTS 'students';