这是我的表名 tblPE
PEID |idnum | PE_DATE_EXAM | ATTENDANCE
1 | 39 | 2014-08-01 | PRESENT
2 | 42 | 2014-08-10 | ABSENT
3 | 39 | 2014-08-12 | PRESENT
4 | 43 | 2014-08-05 | PRESENT
5 | 42 | 2014-07-15 | NULL
6 | 39 | 2014-07-03 | ABSENT
7 | 41 | 2014-08-01 | PRESENT
我想选择最大 PE_DATE_EXAM 值，其中 idnum = 39 且 ATTENDANCE=PReSENT
结果应该是：
PEID |idnum | PE_DATE_EXAM | ATTENDANCE
-------------------------------------------
3 | 39 | 2014-08-12 | PRESENT