Foreign key not working in MySQL: Why can I INSERT a value that's not in the foreign column?

Question

I\'ve created a table in MySQL:

CREATE TABLE actions ( A_id int NOT NULL AUTO_INCREMENT,
type ENUM(\'rate\',\'report\',\'submit\',\'edit\',\'delete\') NOT NU         


        

Answer 1

I know this thread was opened long time ago, but I am posting this message for future users who will look for the answer. I was having the same problem with foreign key in mysql. The following thing worked for me.

Parent table:

CREATE TABLE NameSubject (
  Autonumber INT NOT NULL AUTO_INCREMENT,
  NameorSubject nvarchar(255),
  PRIMARY KEY (Autonumber)
 ) ENGINE=InnoDB;

Child Table:

CREATE TABLE Volumes (
  Autonumber INT NOT NULL,
  Volume INT,
  Pages nvarchar(50),
  Reel int,
  Illustrations bit,
  SSMA_TimeStamp timestamp,
  Foreign KEY (Autonumber) references NameSubject(Autonumber)
  ON  update cascade 
)engine=innodb;

"ON update cascade" did the magic for me.

I hope this works for others. Best of luck.