+-------------+---------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------------+---------+------+-----+---------+-------+ | ID | int(11) | YES | | NULL | | | CHAIN_ID | char(1) | NO | MUL | NULL | | | SEQ_ID | int(11) | NO | MUL | NULL | | | SEQ_NAME | char(2) | NO | MUL | NULL | | | PREV_X | char(1) | NO | MUL | NULL | | | NEXT_X | char(1) | NO | MUL | NULL | | | KEY_ID | int(11) | NO | MUL | NULL | | | FIRSTKEY_ID | int(11) | NO | MUL | NULL | | +-------------+---------+------+-----+---------+-------+