MySQL: ON DELETE

#MySQL #tutorial #course 00:00:00 intro 00:02:24 SET NULL 00:04:40 CASCADE 00:07:11 conclusion ALTER TABLE transactions ADD CONSTRAINT fk_customer_id FOREIGN KEY (customer_id) REFERENCES customers(customer_id) ON DELETE SET NULL; ALTER TABLE transactions ADD CONSTRAINT fk_customer_id FOREIGN KEY (customer_id) REFERENCES customers(customer_id) ON DELETE CASCADE;