mysql> select macadd,forward,reverse,snr,forward_mer from tbl_rf where macadd='bbaa.d712.587d' and date='2008-02-18-h22-m25-s09' and forward_mer is not null;
+----------------+---------+---------+--------+-------------+
| macadd         | forward | reverse | snr    | forward_mer |
+----------------+---------+---------+--------+-------------+
| bbaa.d712.587d |   0.000 |   0.000 | 15.800 |             |
+----------------+---------+---------+--------+-------------+
1 row in set (20.54 sec)

mysql>