雪花层级

Question

我能够获取经理下的所有员工和向这些员工报告的子员工但我也想获得根经理的经理行。 我怎样才能做到这一点

    select employee_id, first_name, last_name, manager_id, manager_name
from employee
start  with manager_name = 108
connect by prior employee_id = manager_id

但我也期待得到经理的经理，如下所示

Answer 1

如果应用此语法会发生什么：

CONNECT BY <col_1_identifier> = PRIOR <col_2_identifier>

经过：

select employee_id, first_name, last_name, manager_id, manager_name
from employee
start  with manager_name = 108
connect by prior employee_id = Prior manager_id