1 SET foreign_key_checks=0;
2 CREATE TABLE t1 (id int, foreign key (id) references t2(id)) ENGINE=INNODB;
3 CREATE TABLE t2 (id int, foreign key (id) references t1(id)) ENGINE=INNODB;
4 SET foreign_key_checks=1;
5 SELECT COUNT(*) FROM information_schema.key_column_usage WHERE REFERENCED_TABLE_NAME in ('t1', 't2');
8 SET foreign_key_checks=0;