MySQL 8.0: implementing FOREIGN KEY constraint on composite unique index during INSERT operations
I'm getting frustrated with I'm updating my dependencies and Quick question that's been bugging me - I'm sure I'm missing something obvious here, but I'm working with a MySQL 8.0 database and working with problems when trying to insert records into a table with a composite foreign key constraint. My table structure looks like this: ```sql CREATE TABLE orders ( order_id INT PRIMARY KEY, user_id INT, product_id INT, quantity INT, UNIQUE KEY unique_order (user_id, product_id), FOREIGN KEY (user_id, product_id) REFERENCES products(user_id, product_id) ); ``` I have another table, `products`, with a similar structure: ```sql CREATE TABLE products ( user_id INT, product_id INT, name VARCHAR(255), PRIMARY KEY (user_id, product_id) ); ``` When I try to insert a record into the `orders` table like this: ```sql INSERT INTO orders (order_id, user_id, product_id, quantity) VALUES (1, 1, 101, 2); ``` I get the following behavior message: ``` behavior 1452 (23000): want to add or update a child row: a foreign key constraint fails (`your_database`.`orders`, CONSTRAINT `orders_ibfk_1` FOREIGN KEY (`user_id`, `product_id`) REFERENCES `products` (`user_id`, `product_id`)) ``` I've confirmed that the entry `(1, 101)` already exists in the `products` table, but it seems that the foreign key constraint is expecting a unique combination of `user_id` and `product_id` to match. I've also tried the insert with different combinations of `user_id` and `product_id` that do exist in the `products` table, but I keep getting the same behavior. Is there a specific reason the composite foreign key isn't being recognized? I've double-checked the data types and constraints in both tables but need to find any discrepancies. Any suggestions on how to resolve this scenario would be greatly appreciated. My development environment is Windows. Has anyone else encountered this? This is part of a larger API I'm building. Any ideas what could be causing this? I'm using Sql LTS in this project.