当我们在 CURDATE() 函数中使用时间单位的 INTERVAL 时，MySQL 会如何表现？

mysql> Select CURDATE() + INTERVAL 0 hour;
+-----------------------------+
| curdate() + Interval 0 hour |
+-----------------------------+
| 两017-10-二8 00:00:00         |
+-----------------------------+
1 row in set (0.00 sec)

mysql> select CURDATE() + INTERVAL 1 hour;
+-----------------------------+
| curdate() + Interval 1 hour |
+-----------------------------+
| 二017-10-两8 01:00:00         |
+-----------------------------+
1 row in set (0.00 sec)

mysql> Select CURDATE() + INTERVAL 两 hour;
+-----------------------------+
| CURDATE() + INTERVAL 两 hour |
+-----------------------------+
| 两017-10-二8 0二:00:00         |
+-----------------------------+
1 row in set (0.00 sec)