SQL query:

CREATE TABLE Customers (
	CustomerId INTEGER UNSIGNED NOT NULL AUTO_INCREMENT,
	Name VARCHAR(255) NOT NULL,
	Album VARCHAR(255) NOT NULL,
	Copies INTEGER,
	PRIMARY KEY (CustomerId),
	CONSTRAINT FKC1
		FOREIGN KEY FKalbum (Album)
		REFERENCES Discs (DiscID)
		ON DELETE CASCADE
		ON UPDATE CASCADE
)

MySQL said: Documentation
#1005 - Can't create table `store`.`customers` (errno: 150 "Foreign key constraint is incorrectly formed") (Details…)