text: create table "user" (
    id number(19) not null primary key,
    username varchar2(50 char) not null,
    email varchar2(100 char) not null
  );
  
  create table configuration (
    user_id number(19) not null,
    name varchar2(100 char) not null,
    value varchar2(200 char),
    
    primary key (user_id, name),
    constraint fk_configuration_user foreign key (user_id) references "user"(id) 
  );