错误代码：1215：无法添加外键约束MYSql

Question

如果我的问题看起来陈词滥调，我真的不太喜欢编程。每当我尝试这个程序时，我得到“错误代码：1215：无法添加外键约束MYSql”

create table department(dept_name varchar(20) primary key,
building varchar(15),
budget numeric(12,2));
create table course(course_id varchar (7),
title varchar (50),
dept_name varchar (20),
credits numeric (2,0),
primary key (course_id),
foreign key (dept_name) references department);

有人可以帮助我

Answer 1

您尚未定义要引用的dept_name列。请试试这个：

create table department(dept_name varchar(20) primary key,
building varchar(15),
budget numeric(12,2));
create table course(course_id varchar (7),
title varchar (50),
dept_name varchar (20),
credits numeric (2,0),
primary key (course_id),
foreign key (dept_name) references department(dept_name));