Daniel, ----- Original Message ----- From: "Daniel Rand" <[EMAIL PROTECTED]> Newsgroups: mailing.database.mysql Sent: Monday, May 13, 2002 5:24 PM Subject: InnoDB Foreign Key Constraints
> Hi, > > Does anyone know if it's possible to set up a foreign key constraint where > one table references the primary key of another table in a different > database (both tables being of InnoDB type). yes, you can use the databasename.tablename syntax: heikki@hundin:~/mysql/client> mysql test Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 1 to server version: 3.23.51-log Type 'help;' or '\h' for help. Type '\c' to clear the buffer. mysql> show create table aaa; +-------+------------------------------------------------------------------- ---- -------------------------------------------------------------------+ | Table | Create Table | +-------+------------------------------------------------------------------- ---- -------------------------------------------------------------------+ | aaa | CREATE TABLE `aaa` ( `a` int(11) NOT NULL default '0', `b` int(11) default NULL, PRIMARY KEY (`a`), KEY `b` (`b`) ) TYPE=InnoDB | +-------+------------------------------------------------------------------- ---- -------------------------------------------------------------------+ 1 row in set (0.01 sec) mysql> use test11 Database changed mysql> create table mmm (a int not null, b int, primary key (a), index (b), fore ign key (b) references test.aaa (a)); Query OK, 0 rows affected (0.00 sec) mysql> show create table mmm; +-------+------------------------------------------------------------------- ---- ---------------------------------------------------------------------------- ---- ------------------------------------+ | Table | Create Table | +-------+------------------------------------------------------------------- ---- ---------------------------------------------------------------------------- ---- ------------------------------------+ | mmm | CREATE TABLE `mmm` ( `a` int(11) NOT NULL default '0', `b` int(11) default NULL, PRIMARY KEY (`a`), KEY `b` (`b`), FOREIGN KEY (`b`) REFERENCES `test.aaa` (`a`) ) TYPE=InnoDB | +-------+------------------------------------------------------------------- ---- ---------------------------------------------------------------------------- ---- ------------------------------------+ 1 row in set (0.00 sec) mysql> > Thanks, > > DAN Best regards, Heikki Tuuri Innobase Oy --- InnoDB - transactions, hot backup, and foreign key support for MySQL See http://www.innodb.com, download MySQL-Max from http://www.mysql.com --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php