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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 (product_category, product_id)
REFERENCES product(category, id) ON UPDATE CASCADE ON DELETE RESTRICT,
INDEX (customer_id),
FOREIGN KEY (customer_id)
REFERENCES customer(id)
) ENGINE=INNODB;
SELECT * FROM INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS;
CONSTRAINT_CATALOG def
CONSTRAINT_SCHEMA test
CONSTRAINT_NAME product_order_ibfk_1
UNIQUE_CONSTRAINT_CATALOG def
UNIQUE_CONSTRAINT_SCHEMA test
UNIQUE_CONSTRAINT_NAME PRIMARY
MATCH_OPTION NONE
UPDATE_RULE CASCADE
DELETE_RULE RESTRICT
TABLE_NAME product_order
REFERENCED_TABLE_NAME product
CONSTRAINT_CATALOG def
CONSTRAINT_SCHEMA test
CONSTRAINT_NAME product_order_ibfk_2
UNIQUE_CONSTRAINT_CATALOG def
UNIQUE_CONSTRAINT_SCHEMA test
UNIQUE_CONSTRAINT_NAME PRIMARY
MATCH_OPTION NONE
UPDATE_RULE RESTRICT
DELETE_RULE RESTRICT
TABLE_NAME product_order
REFERENCED_TABLE_NAME customer
DROP TABLE product_order;
DROP TABLE product;
DROP TABLE customer;
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