Fatal error: Uncaught mysqli_sql_exception: Cannot delete or update a parent row: a foreign key constraint fails (`hjta227ict301`.`Order_Pizza`, CONSTRAINT `Order_Pizza_ibfk_2` FOREIGN KEY (`pizzaID`) REFERENCES `Pizza` (`pizzaID`)) in /var/www/html/ict301/001/hjta227/pizza_project/delete_pizza.php:9 Stack trace: #0 /var/www/html/ict301/001/hjta227/pizza_project/delete_pizza.php(9): mysqli_query() #1 {main} thrown in /var/www/html/ict301/001/hjta227/pizza_project/delete_pizza.php on line 9