WHat are the table engine types ? On Fri, May 20, 2011 at 4:37 PM, Mimi Cafe <mimic...@googlemail.com> wrote:
> Hi > > An ideas why MySQL silently ignores any foreign key constraints I define > for > the following tables? > > > mysql> desc book; > > +------------------+-------------------------------+------+-----+---------+- > ------+ > | Field | Type | Null | Key | Default | > Extra | > > +------------------+-------------------------------+------+-----+---------+- > ------+ > | pkisbn | varchar(20) | NO | PRI | NULL | > | > | fkpublisher_id | tinyint(3) unsigned | NO | MUL | NULL | > | > | title | varchar(50) | NO | | NULL | > | > | subtitle | varchar(50) | NO | | NULL | > | > 13 rows in set (0.01 sec) > > mysql> desc book_author; > +-------------+------------------------+------+-----+---------+-------+ > | Field | Type | Null | Key | Default | Extra | > +-------------+------------------------+------+-----+---------+-------+ > | fkauthor_id | mediumint(10) unsigned | NO | MUL | NULL | | > | fkisbn | varchar(20) | NO | MUL | NULL | | > +-------------+------------------------+------+-----+---------+-------+ > 2 rows in set (0.00 sec) > > mysql> desc author; > > +-------------+------------------------+------+-----+---------+------------- > ---+ > | Field | Type | Null | Key | Default | Extra > | > > +-------------+------------------------+------+-----+---------+------------- > ---+ > | pkauthor_id | mediumint(10) unsigned | NO | PRI | NULL | > auto_increment | > | fname | varchar(20) | NO | | NULL | > | > | initial | varchar(5) | YES | | NULL | > | > | lname | varchar(20) | NO | | NULL | > | > > +-------------+------------------------+------+-----+---------+------------- > ---+ > 4 rows in set (0.00 sec) > > > Mimi > -- Thanks Suresh Kuna MySQL DBA
