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创建department表:
create table department(
dept_name varchar(20),
budget int,
descript varchar(20),
primary key(dept_name)
);
创建course表:
create table course(
course_id varchar(20),
deptnames varchar(20),
credits int,
foreign key(deptnames) references department(dept_name));
course表的外键deptnames指向department表的dept_name。
若要删除department,course这两个表,则必须先删除course表,再删除department表。