我有以下数据：
road | ID | other column | other column |
------------------+------+---------------+--------------+
MAIN ST | 1 | ... | ... |
MAIN ST | 2 | ... | ... |
MAIN ST | 3 | ... | ... |
BERRY LN | 4 | ... | ... |
BERRY LN | 5 | ... | ... |
BERRY LN | 6 | ... | ... |
JOHN RD | 7 | ... | ... |
JOHN RD | 8 | …