text: drop table t_coffee if exists ;
  drop table t_order if exists ;
  drop table t_order_coffee if exists ;
  
  create table t_coffee (
      id bigint auto_increment,
      name varchar (255),
      price bigint,
      create_time timestamp,
      update_time timestamp,
      primary key (id)
  );
  
  create table t_order (
      id bigint auto_increment,
      customer varchar (255),
      state integer not null,
      create_time timestamp,
      update_time timestamp,
      primary key (id)
  );
  
  create table t_order_coffee (
      coffee_order_id bigint not null,
      items_id bigint not null
  );
  