Fatal error: Uncaught mysqli_sql_exception: Cannot delete or update a parent row: a foreign key constraint fails (`hjta227ict301`.`Delivery`, CONSTRAINT `Delivery_ibfk_1` FOREIGN KEY (`orderID`) REFERENCES `Orders` (`orderID`)) in /var/www/html/ict301/001/hjta227/pizza_project/delete_order.php:9 Stack trace: #0 /var/www/html/ict301/001/hjta227/pizza_project/delete_order.php(9): mysqli_query() #1 {main} thrown in /var/www/html/ict301/001/hjta227/pizza_project/delete_order.php on line 9