我使用以下sql创建了一个表：

CREATE TABLE import_xlsx (
id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
date DATETIME,
pair VARCHAR(10),
action VARCHAR(5),
volume DECIMAL(20,8),
order_price DECIMAL(20,8),
trading_price DECIMAL(20,8),
status VARCHAR(20),
CONSTRAINT table_unique UNIQUE (date, pair, action));

我有这个 INSERT :

INSERT INTO binance_xlsx (date, pair, action, volume, order_price, trading_price, status)
VALUES('2018-05-14 13:58:54', 'ETHUSDT', 'SELL', '0.1', '725.0', '724.95', 'Filled') 
ON DUPLICATE KEY UPDATE 
status = VALUES(status);

我故意插入了重复的行，数字id是自动递增的。但行数仍然是1。不应该只在插入新行时自动递增吗？
结果如下：

+----+---------------------+---------+--------+------------+--------------+---------------+--------+
| id | date                | pair    | action | volume     | order_price  | trading_price | status |
+----+---------------------+---------+--------+------------+--------------+---------------+--------+
|  1 | 2018-05-14 13:58:53 | ETHUSDT | BUY    | 0.09889000 | 725.00000000 |  724.95000000 | Filled |
| 11 | 2018-05-14 13:58:53 | ETHUSDT | SELL   | 0.10000000 | 725.00000000 |  724.95000000 | Filled |
| 13 | 2018-05-14 13:58:54 | ETHUSDT | SELL   | 0.10000000 | 725.00000000 |  724.95000000 | Filled |
+----+---------------------+---------+--------+------------+--------------+---------------+--------+

如何保持 id 按顺序自动递增？