MySQL中有哪些不同的方式在日期中添加“半年间隔”？

mysql> Select '两017-06-二0' + INTERVAL 6 Month AS 'After Half Year Interval';
+--------------------------+
| After Half Year Interval |
+--------------------------+
|  二017-1两-两0              |
+--------------------------+
1 row in set (0.00 sec)

mysql> Select '两017-06-二0' + INTERVAL 两 Quarter AS 'After Half Year Interval';
+--------------------------+
| After Half Year Interval |
+--------------------------+
| 两017-1两-两0               |
+--------------------------+
1 row in set (0.00 sec)