我在在线学费中心有2个教师和课程表，如下所示：
教师表：
+----+--------------------+-----------+----------+
| id | booking_time | teacher | student |
+----+--------------------+-----------+----------+
| 1 | 2017-08-08 12:00:00| 3 | 40 |
| 2 | 2017-10-03 12:00:00| 1 | 50 |
| 3 | 2017-12-01 12:00:00| 2 | 60 |
| 4 | 2018-01-01 12:00:00| 3 | 40 |
| 5 | 2018-02-01 12:00:00| 2 | 60 |
| 6 | 2018-03-02 12:00:00| 3 | 40 |
| 7 | 2018-03-04 12:00:00| 1 | 50 |
| 8 | 2018-03-06 12:00:00| 1 | 50 |
+----+--------------------+-----------+----------+
课程表：
+-------+------+------+------+------+------+------+------+------+------+-------+------+------+
|Teacher|Mar-18|Feb-18|Jan-18|Dec-17|Nov-17|Oct-17|Sep-17|Aug-17|Jul-17| Jun-17|May-17|Apr-17|
+-------+------+------+------+------+------+------+------+------+------+-------+------+------+
|John |2 |0 |0 |0 |0 |1 |0 |0 |0 |0 |0 |0 |
|Bill |1 |0 |1 |0 |0 |0 |0 |1 |0 |0 |0 |0 |
|Mike |0 |1 |0 |1 |0 |0 |0 |0 |0 |0 |0 |0 |
+-------+------+------+------+------+------+------+------+------+------+-------+------+------+
我需要在过去12个月（从当月开始）获得每位教师的预订课程，并按当前月份的最高预订进行排序。类似的东西：
select value from mytable where
indx = @var
and f() in (select num from nums);
任何帮助我怎么能这样做？