[Discover] MySQL 5.0 Reference Manual :: 14.2.6.4 FOREIGN KEY Constraints http://dev.mysql.com/doc/refman/5.0/en/innodb-foreign-key-constraints.html
(key sql mysql constraints) 
[Discover] Referential Integrity in MySQL http://www.databasejournal.com/features/mysql/article.php/2248101 (foreignkeys sql programming tutorial)
[Discover] Composite Primary Keys http://compositekeys.rubyforge.org/ (rails activerecord composite rubyonrails)
[Discover] #6565 (delete() method is not called on related objects) - Django Code - Trac http://code.djangoproject.com/ticket/6565 (foreign delete django)
[Discover] Raaum's Rails Reader: ActiveRecord http://rails.raaum.org/activerecord.html (rails activerecord tutorial rubyonrails)
[Discover] Referential Integrity in MySQL http://www.databasejournal.com/features/mysql/article.php/2248101 (foreignkeys sql programming tutorial)
[Discover] Composite Primary Keys http://compositekeys.rubyforge.org/ (rails activerecord composite rubyonrails)
[Discover] #6565 (delete() method is not called on related objects) - Django Code - Trac http://code.djangoproject.com/ticket/6565 (foreign delete django)
[Discover] Raaum's Rails Reader: ActiveRecord http://rails.raaum.org/activerecord.html (rails activerecord tutorial rubyonrails)