MySQL的参照完整性

Question

我有3个表

create table movies(
    movie_id int PRIMARY KEY AUTO_INCREMENT, 
    budget decimal(10,3) NOT NULL, 
    name varchar(20) NOT NULL); 

create table actor(
    actor_id int primary key auto_increment, 
    name varchar(13) not null, 
    salary decimal(12,2) not null); 

create table movie_actor(movie_id int not null references movies (movie_id), 
          actor_id int not null references actor (actor_id), 
          constraint movie_actor_pk primary key (movie_id,actor_id)) 

.I已插入数据到它们。

mysql> select * from movies; 
+----------+----------+------------+ 
| movie_id | budget | name  | 
+----------+----------+------------+ 
|  1 | 1000.000 | rambo  | 
|  2 | 2000.000 | rocky  | 
|  3 | 8000.000 | terminator | 
+----------+----------+------------+ 
3 rows in set (0.00 sec) 

mysql> select * from actor; 
+----------+-----------+--------+ 
| actor_id | name  | salary | 
+----------+-----------+--------+ 
|  100 | sylvester | 100.00 | 
|  101 | arnold | 90.00 | 
+----------+-----------+--------+ 
2 rows in set (0.00 sec) 

mysql> select * from movie_actor; 
+----------+----------+ 
| movie_id | actor_id | 
+----------+----------+ 
|  1 |  100 | 
|  2 |  100 | 
|  3 |  101 | 
|  39 | 10109 | 
+----------+----------+ 
4 rows in set (0.00 sec) 

它的InnoDB引擎 我的问题是在movie_actor表movie_id 39不应该被允许插入movie_actor表按引用完整性，是否正确？

Answer 1

要具有参照完整性必须设置外键约束：

create table movie_actor( 
    movie_id int not null references movies (movie_id), 
    actor_id int not null references actor (actor_id), 
    constraint movie_actor_pk primary key (movie_id,actor_id), 
    constraint foreign key (movie_id) references movies (movie_id), 
    constraint foreign key (actor_id) references actor (actor_id) 
    )