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# engine=innodb
create table product (
category int not null,
id int not null,
price decimal,
primary key(category, id))
engine=innodb;
create table customer (
id int not null,
primary key (id))
engine=innodb;
create table product_order (
no int not null auto_increment,
product_category int not null,
product_id int not null,
customer_id int not null,
primary key(no),
index (product_category, product_id),
foreign key fk1 (product_category, product_id) references product(category, id)
on update restrict on delete cascade,
index (customer_id),
foreign key fk2 (customer_id) references customer(id))
engine=innodb;
create table emp (
id int primary key auto_increment,
manager int,
key (manager),
foreign key fk1 (manager) references emp (id))
engine=innodb;
select *
from information_schema.table_constraints
where table_schema = 'test'
order by table_name, constraint_type, constraint_name;
CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA	CONSTRAINT_NAME	TABLE_SCHEMA	TABLE_NAME	CONSTRAINT_TYPE
def	test	PRIMARY	test	customer	PRIMARY KEY
def	test	emp_ibfk_1	test	emp	FOREIGN KEY
def	test	PRIMARY	test	emp	PRIMARY KEY
def	test	PRIMARY	test	product	PRIMARY KEY
def	test	product_order_ibfk_1	test	product_order	FOREIGN KEY
def	test	product_order_ibfk_2	test	product_order	FOREIGN KEY
def	test	PRIMARY	test	product_order	PRIMARY KEY
COL	ORDINAL_POSITION	POSITION_IN_UNIQUE_CONSTRAINT	REFERENCED_COL
customer.id	1	NULL	
emp.id	1	NULL	
emp.manager	1	1	emp.id
product.category	1	NULL	
product.id	2	NULL	
product_order.customer_id	1	1	customer.id
product_order.no	1	NULL	
product_order.product_category	1	1	product.category
product_order.product_id	2	2	product.id
drop table product_order, customer, product, emp;
create database mydb1;
create database mydb2;
create table mydb1.t1 (
a1 int not null,
b1 int not null,
primary key using hash (a1),
unique key xb1 (b1)
) engine=innodb;
create table mydb2.t2 (
a2 int not null,
b2 int not null,
primary key using hash (a2),
unique key xb2 (b2)
) engine=innodb;
alter table mydb1.t1
add constraint fk_b1a1 foreign key (b1) references mydb1.t1 (a1),
add constraint fk_b1b2 foreign key (b1) references mydb2.t2 (b2);
alter table mydb2.t2
add constraint fk_b2a2 foreign key (b2) references mydb2.t2 (a2),
add constraint fk_b2b1 foreign key (b2) references mydb1.t1 (b1);
select *
from information_schema.referential_constraints
order by constraint_schema, constraint_name;
CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA	CONSTRAINT_NAME	UNIQUE_CONSTRAINT_CATALOG	UNIQUE_CONSTRAINT_SCHEMA	UNIQUE_CONSTRAINT_NAME	MATCH_OPTION	UPDATE_RULE	DELETE_RULE	TABLE_NAME	REFERENCED_TABLE_NAME
def	mydb1	fk_b1a1	def	mydb1	PRIMARY	NONE	RESTRICT	RESTRICT	t1	t1
def	mydb1	fk_b1b2	def	mydb2	xb2	NONE	RESTRICT	RESTRICT	t1	t2
def	mydb2	fk_b2a2	def	mydb2	PRIMARY	NONE	RESTRICT	RESTRICT	t2	t2
def	mydb2	fk_b2b1	def	mydb1	xb1	NONE	RESTRICT	RESTRICT	t2	t1
select *
from information_schema.table_constraints
where table_schema like 'mydb%'
order by table_name, constraint_type, constraint_name;
CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA	CONSTRAINT_NAME	TABLE_SCHEMA	TABLE_NAME	CONSTRAINT_TYPE
def	mydb1	fk_b1a1	mydb1	t1	FOREIGN KEY
def	mydb1	fk_b1b2	mydb1	t1	FOREIGN KEY
def	mydb1	PRIMARY	mydb1	t1	PRIMARY KEY
def	mydb1	xb1	mydb1	t1	UNIQUE
def	mydb2	fk_b2a2	mydb2	t2	FOREIGN KEY
def	mydb2	fk_b2b1	mydb2	t2	FOREIGN KEY
def	mydb2	PRIMARY	mydb2	t2	PRIMARY KEY
def	mydb2	xb2	mydb2	t2	UNIQUE
select *
from information_schema.key_column_usage
where table_schema like 'mydb%'
order by constraint_schema, constraint_name;
CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA	CONSTRAINT_NAME	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	COLUMN_NAME	ORDINAL_POSITION	POSITION_IN_UNIQUE_CONSTRAINT	REFERENCED_TABLE_SCHEMA	REFERENCED_TABLE_NAME	REFERENCED_COLUMN_NAME
def	mydb1	fk_b1a1	def	mydb1	t1	b1	1	1	mydb1	t1	a1
def	mydb1	fk_b1b2	def	mydb1	t1	b1	1	1	mydb2	t2	b2
def	mydb1	PRIMARY	def	mydb1	t1	a1	1	NULL	NULL	NULL	NULL
def	mydb1	xb1	def	mydb1	t1	b1	1	NULL	NULL	NULL	NULL
def	mydb2	fk_b2a2	def	mydb2	t2	b2	1	1	mydb2	t2	a2
def	mydb2	fk_b2b1	def	mydb2	t2	b2	1	1	mydb1	t1	b1
def	mydb2	PRIMARY	def	mydb2	t2	a2	1	NULL	NULL	NULL	NULL
def	mydb2	xb2	def	mydb2	t2	b2	1	NULL	NULL	NULL	NULL
alter table mydb1.t1
drop foreign key fk_b1a1,
drop foreign key fk_b1b2;
alter table mydb2.t2
drop foreign key fk_b2a2,
drop foreign key fk_b2b1;
drop table mydb1.t1;
drop table mydb2.t2;
drop database mydb1;
drop database mydb2;
# engine=ndb
create table product (
category int not null,
id int not null,
price decimal,
primary key(category, id))
engine=ndb;
create table customer (
id int not null,
primary key (id))
engine=ndb;
create table product_order (
no int not null auto_increment,
product_category int not null,
product_id int not null,
customer_id int not null,
primary key(no),
index (product_category, product_id),
foreign key fk1 (product_category, product_id) references product(category, id)
on update restrict on delete cascade,
index (customer_id),
foreign key fk2 (customer_id) references customer(id))
engine=ndb;
create table emp (
id int primary key auto_increment,
manager int,
key (manager),
foreign key fk1 (manager) references emp (id))
engine=ndb;
select *
from information_schema.table_constraints
where table_schema = 'test'
order by table_name, constraint_type, constraint_name;
CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA	CONSTRAINT_NAME	TABLE_SCHEMA	TABLE_NAME	CONSTRAINT_TYPE
def	test	PRIMARY	test	customer	PRIMARY KEY
def	test	fk1	test	emp	FOREIGN KEY
def	test	PRIMARY	test	emp	PRIMARY KEY
def	test	PRIMARY	test	product	PRIMARY KEY
def	test	fk1	test	product_order	FOREIGN KEY
def	test	fk2	test	product_order	FOREIGN KEY
def	test	PRIMARY	test	product_order	PRIMARY KEY
COL	ORDINAL_POSITION	POSITION_IN_UNIQUE_CONSTRAINT	REFERENCED_COL
customer.id	1	NULL	
emp.id	1	NULL	
emp.manager	1	1	emp.id
product.category	1	NULL	
product.id	2	NULL	
product_order.customer_id	1	1	customer.id
product_order.no	1	NULL	
product_order.product_category	1	1	product.category
product_order.product_id	2	2	product.id
drop table product_order, customer, product, emp;
create database mydb1;
create database mydb2;
create table mydb1.t1 (
a1 int not null,
b1 int not null,
primary key using hash (a1),
unique key xb1 (b1)
) engine=ndb;
create table mydb2.t2 (
a2 int not null,
b2 int not null,
primary key using hash (a2),
unique key xb2 (b2)
) engine=ndb;
alter table mydb1.t1
add constraint fk_b1a1 foreign key (b1) references mydb1.t1 (a1),
add constraint fk_b1b2 foreign key (b1) references mydb2.t2 (b2);
alter table mydb2.t2
add constraint fk_b2a2 foreign key (b2) references mydb2.t2 (a2),
add constraint fk_b2b1 foreign key (b2) references mydb1.t1 (b1);
select *
from information_schema.referential_constraints
order by constraint_schema, constraint_name;
CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA	CONSTRAINT_NAME	UNIQUE_CONSTRAINT_CATALOG	UNIQUE_CONSTRAINT_SCHEMA	UNIQUE_CONSTRAINT_NAME	MATCH_OPTION	UPDATE_RULE	DELETE_RULE	TABLE_NAME	REFERENCED_TABLE_NAME
def	mydb1	fk_b1a1	def	mydb1	PRIMARY	NONE	NO ACTION	NO ACTION	t1	t1
def	mydb1	fk_b1b2	def	mydb2	xb2$unique	NONE	NO ACTION	NO ACTION	t1	t2
def	mydb2	fk_b2a2	def	mydb2	PRIMARY	NONE	NO ACTION	NO ACTION	t2	t2
def	mydb2	fk_b2b1	def	mydb1	xb1$unique	NONE	NO ACTION	NO ACTION	t2	t1
select *
from information_schema.table_constraints
where table_schema like 'mydb%'
order by table_name, constraint_type, constraint_name;
CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA	CONSTRAINT_NAME	TABLE_SCHEMA	TABLE_NAME	CONSTRAINT_TYPE
def	mydb1	fk_b1a1	mydb1	t1	FOREIGN KEY
def	mydb1	fk_b1b2	mydb1	t1	FOREIGN KEY
def	mydb1	PRIMARY	mydb1	t1	PRIMARY KEY
def	mydb1	xb1	mydb1	t1	UNIQUE
def	mydb2	fk_b2a2	mydb2	t2	FOREIGN KEY
def	mydb2	fk_b2b1	mydb2	t2	FOREIGN KEY
def	mydb2	PRIMARY	mydb2	t2	PRIMARY KEY
def	mydb2	xb2	mydb2	t2	UNIQUE
select *
from information_schema.key_column_usage
where table_schema like 'mydb%'
order by constraint_schema, constraint_name;
CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA	CONSTRAINT_NAME	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	COLUMN_NAME	ORDINAL_POSITION	POSITION_IN_UNIQUE_CONSTRAINT	REFERENCED_TABLE_SCHEMA	REFERENCED_TABLE_NAME	REFERENCED_COLUMN_NAME
def	mydb1	fk_b1a1	def	mydb1	t1	b1	1	1	mydb1	t1	a1
def	mydb1	fk_b1b2	def	mydb1	t1	b1	1	1	mydb2	t2	b2
def	mydb1	PRIMARY	def	mydb1	t1	a1	1	NULL	NULL	NULL	NULL
def	mydb1	xb1	def	mydb1	t1	b1	1	NULL	NULL	NULL	NULL
def	mydb2	fk_b2a2	def	mydb2	t2	b2	1	1	mydb2	t2	a2
def	mydb2	fk_b2b1	def	mydb2	t2	b2	1	1	mydb1	t1	b1
def	mydb2	PRIMARY	def	mydb2	t2	a2	1	NULL	NULL	NULL	NULL
def	mydb2	xb2	def	mydb2	t2	b2	1	NULL	NULL	NULL	NULL
alter table mydb1.t1
drop foreign key fk_b1a1,
drop foreign key fk_b1b2;
alter table mydb2.t2
drop foreign key fk_b2a2,
drop foreign key fk_b2b1;
drop table mydb1.t1;
drop table mydb2.t2;
drop database mydb1;
drop database mydb2;

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