CREATE TABLE people (
    firstname varchar(32) not null, 
    lastname varchar(32) not null, 
    extension varchar(8) not null,
    digit_index varchar(32)
  );

  insert into people (firstname, lastname, extension) values ('john', 'smith','1234');
  insert into people (firstname, lastname, extension) values ('eric', 'anderson','5555');
  insert into people (firstname, lastname, extension) values ('will', 'example','9124');