此语法在创建外键时是否正确?
create table department
(
departmentID int not null auto_increment primary key,
name varchar(30)
) type=InnoDB;
create table employee
(
employeeID int not null auto_increment primary key,
name varchar(80),
job varchar(30),
departmentID int not null references department(departmentID)
) type=InnoDB;
最佳答案
看起来 MySQL 接受了它(不提示语法)但实际上并没有创建外键。
要创建这个外键,运行这个命令:
ALTER TABLE employee ADD CONSTRAINT fk_department FOREIGN KEY (departmentID) REFERENCES department (departmentID);
关于创建外键的 MySQL 语法,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/6977086/