请看这张表:
mysql> desc s_p;
+-------------------------+------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------------------------+------------------+------+-----+---------+----------------+
| id | int(10) unsigned | NO | PRI | NULL | auto_increment |
| s_pid | int(10) unsigned | YES | MUL | NULL | |
| sm_id | int(10) unsigned | YES | MUL | NULL | |
| m_id | int(10) unsigned | YES | | NULL | |
| created | datetime | YES | | NULL …
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