一个简单的树查询

SQL> select * from treeview;

PARENT     CHILD
---------- ----------
a          b
a          c
a          e
b          b1
b          b2
c          c1
e          e1
e          e3
c          e

9 rows selected.

SQL> select * from treeview start with parent='c' connect by child=parent;

PARENT     CHILD
---------- ----------
c          c1
c          e

SQL> select * from treeview start with parent='c' connect by prior child=parent;

PARENT     CHILD
---------- ----------
c          c1
c          e
e          e1
e          e3

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