Коллеги, помогите с ошибкой. 1215 cannot add foreign constraint. не дает создать Invoices
-- создаем таблицу Покупателей
CREATE TABLE IF NOT EXISTS customers (
customer_id bigint(20) unsigned NOT NULL AUTO_INCREMENT PRIMARY KEY,
first_name varchar(145) NOT NULL,
last_name varchar(145) NOT NULL,
email varchar(145) NOT NULL,
birth_date date DEFAULT NULL,
phone char(11) NOT NULL,
city varchar(50) NOT NULL,
points int(11) NOT NULL DEFAULT '0'
) ENGINE=InnoDB;
-- создаем таблицу накладных
CREATE TABLE IF NOT EXISTS invoices (
invoice_id int(11) NOT NULL AUTO_INCREMENT PRIMARY KEY,
customer_id bigint,
invoice_total decimal(9,2) NOT NULL,
payment_date date DEFAULT NULL,
CONSTRAINT FK_customer_id FOREIGN KEY (customer_id) REFERENCES customers (customer_id) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB;