Mysql – Disappearing Foreign Keys in phpMyAdmin

foreign-keysmysqlphpmyadmin

I am creating a new table inside mysql and I am trying to add a foreign key constraint to one of the fields.

CREATE TABLE `onlineorder` (
  `receiptid` varchar(10) NOT NULL default '',
  `delivereddate` date default NULL,
  `cid` int(10) NOT NULL,
  `card#` int(10) default NULL,
  `expire` date default NULL,
  PRIMARY KEY  (`receiptid`),
  FOREIGN KEY (receiptid) REFERENCES purchase
) ENGINE=MyISAM DEFAULT CHARSET=latin1;

However, after it creates it, I go into phpMyAdmin and export the table. and it seems like the foreign key constraint has disappeared.

CREATE TABLE `onlineorder` (
  `receiptid` varchar(10) NOT NULL default '',
  `delivereddate` date default NULL,
  `cid` int(10) NOT NULL,
  `card#` int(10) default NULL,
  `expire` date default NULL,
  PRIMARY KEY  (`receiptid`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1;

Does phpMyAdmin get rid of foreign keys or am I doing something wrong here?

Best Solution

You need to use the InnoDB engine to have foreign keys.

Ref: http://dev.mysql.com/doc/refman/5.0/en/innodb-foreign-key-constraints.html

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