oracle SQL
--子查父
select * from man_menue_hg m
start with m.m
connect by prior m.par_mid = m.mid;
--父查子
select * from man_menue_hg m
start with m.par_mid = '0'
connect by prior m.mid = m.par_mid
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--子查父
select * from man_menue_hg m
start with m.m
connect by prior m.par_mid = m.mid;
--父查子
select * from man_menue_hg m
start with m.par_mid = '0'
connect by prior m.mid = m.par_mid
