Miscellany

mysql> select * from attendance;
+-----+-----+--------+
| nid | uid | status |
+-----+-----+--------+
|   1 |   2 |      1 |
|   1 |   1 |      1 |
|   1 |   3 |      0 |
|   2 |   1 |      1 |
+-----+-----+--------+
4 rows in set (0.00 sec)