我有以下InnoDB表:
+-----------+-----------+------+-----+-------------------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-----------+-----------+------+-----+-------------------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| doc_id | char(32) | NO | | NULL | |
| staff | char(18) | NO | | NULL | |
| timestamp | timestamp | NO | MUL | CURRENT_TIMESTAMP | |
+-----------+-----------+------+-----+-------------------+----------------+
使用这些键:
+--------------+------------+-----------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+
| Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality …