oracle start with 递归按照父子关系排序
select * from lbl_info start with prn_id is null connect by prior id=prn_id order siblings by sort asc
把有父子关系的数据按照一棵树的顺序排序
每次递归后，单独排序，即父节点下紧跟着子节点，子节点下紧跟着孙节点，直到无下级节点，就按层级返回接着排序
select * from lbl_info start with prn_id is null connect by prior id=prn_id order siblings by sort asc
把有父子关系的数据按照一棵树的顺序排序
每次递归后，单独排序，即父节点下紧跟着子节点，子节点下紧跟着孙节点，直到无下级节点，就按层级返回接着排序