Referential integrity
Referential integrity means that when a record in a table refers to a corresponding record in another table, that corresponding record will exist. To read more about this follow the following links.
1.http://www.databasejournal.com/features/mysql/article.php/10897_2248101_1
2.http://dev.mysql.com/doc/refman/5.1/en/innodb-foreign-key-constraints.html
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