/* create.sql */ create schema DQ; /* 系統 */ create table DQ.family ( family_id integer not null, family_name varchar(255) not null, primary key (family_id) ); /* モンスター */ create table DQ.monster ( monster_id integer not null, monster_name varchar(255) not null, level integer not null, family_id integer, /* 魔王の場合はNULL */ primary key (monster_id), foreign key (family_id) references DQ.family (family