数据库树形结构,正反遍历
--从Root往树末梢递归
select level ,identity,pid from table_name
start with identity=475
connect by prior identity = pid
--从末梢往树ROOT递归
select level ,identity,pid,yylevel from table_name
start with identity=542
connect by prior pid = identity
时间: 2024-10-13 00:09:33