http://www.blogjava.net/freeman1984/archive/2011/05/06/349668.html
http://www.blogjava.net/freeman1984/archive/2011/05/06/349668.html
select * from branch connect by prior branch_id = parent_branch_id start with branch_id ='123' or branch_id ='124';
select * from branch connect by branch_id = prior parent_branch_id ;
connect by prior
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