2022-12-17：订单最多的客户。以下数据，结果输出3。请问sql语句如何写？```sqlDROP TABLE IF EXI

DROP TABLE IF EXISTS `orders`;
CREATE TABLE `orders` (
  `order_number` int(11) NOT NULL,
  `customer_number` int(11) NOT NULL,
  PRIMARY KEY (`order_number`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

INSERT INTO `orders` VALUES ('1', '1');
INSERT INTO `orders` VALUES ('2', '2');
INSERT INTO `orders` VALUES ('3', '3');
INSERT INTO `orders` VALUES ('4', '3');

SELECT
    customer_number
FROM
    orders
GROUP BY customer_number
ORDER BY COUNT(*) DESC
LIMIT 1