我有这3张桌子
forums_forum
+-----+--------+-------------+-------+-----+
| fid | name | description | index | cid |
+-----+--------+-------------+-------+-----+
| 36 | gdghdf | hjghj | 54 | 5 |
| 45 | yutuy | iuyi | 99 | 6 |
+-----+--------+-------------+-------+-----+
forums_threads
+----+-----+-----+-------+-------+------+-----------+------+
| id | tid | fid | moved | mfrom | view | important | lock |
+----+-----+-----+-------+-------+------+-----------+------+
| 1 | 4 | 36 | 0 | NULL | 0 | 0 | 0 |
| 2 | 12 | …