I am a newbie to PHP. I have been given the code snippet below as homework:
CREATE TABLE `admin_log` (
`id` INT(11) NOT NULL AUTO_INCREMENT,
`statusdate` DATETIME DEFAULT NULL,
`type` INT(11) DEFAULT NULL
PRIMARY KEY (`id`)
) ENGINE=MYISAM AUTO_INCREMENT=1 DEFAULT CHARSET=latin
Why will it not be possible to set up any foreign key constraints using this table?
I have done some research on Google and I cant find a reason why foreign key constraints are not possible. Please help
You can do that like this :
CREATE TABLE `admin_log` (
`id` INT(11) NOT NULL AUTO_INCREMENT,
`statusdate` DATETIME DEFAULT NULL,
`type` INT(11) DEFAULT NULL,
INDEX (type),
FOREIGN KEY (type)
REFERENCES type(id)
ON UPDATE CASCADE ON DELETE RESTRICT,
PRIMARY KEY (`id`)
) ENGINE=INNODB AUTO_INCREMENT=1 DEFAULT CHARSET=latin
Notice the engine INNODB insetad of MYISAM which doesn't permit foreign key.
Or using MySQLAdmin in the "structure" tab, click on the "relationals view" link below the table description.
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