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Possible Duplicate:
What is MySQL's default ON DELETE behavior?
Hi all just want to know what the on delete and on update are set to on a foreign key if you dont specify what they are on a MYSQL database. I’ve been searching and cant really find out the answer. Like if I just create a foreign key what are they set too. Thanks.
via http://dev.mysql.com/doc/refman/5.5/en/innodb-foreign-key-constraints.html