MySQL代码的问题？

Question

我在PRIMARY KEY附近遇到了一个错误,但无法确定究竟是什么,有人可以看看吗？

CREATE TABLE `reports` (

    `key`                   INT UNSIGNED AUTO_INCREMENT, 
    `role`                  VARCHAR(70), 
    `region`                VARCHAR(70),
    `inspection_type`       VARCHAR(70),
    `inspection_number`     VARCHAR(70),
    `customer_number`       VARCHAR(70),

    `report_date`           DATE DEFAULT NULL,  



    `order_date`            DATE DEFAULT NULL,  


    `customer`              VARCHAR(70),
    `customer_division`     VARCHAR(70),
    `location`              VARCHAR(70),
    `memo`                  VARCHAR(255),       
    `billingkey`            VARCHAR(70),

    PRIMARY KEY(key)

) ENGINE=InnoDB DEFAULT CHARSET=UTF8;

Answer 1

包含key在反引号中.它是MySQL保留的关键字.

PRIMARY KEY(`key`)