這個方法只是對oracle10以上才有效，對sqlserver、mysql沒有測試
select connect_by_isleaf isleaf,
tb.switch_type_id,
sys_connect_by_path(tb.package_id, '|') path,
tb.record_type,
tb.element_offset,
tb.element_length,
tb.element_encode_type,
tb.element_align,
tb.mask,
tb.asn_type
from (select b.switch_type_id,
b.package_id,
b.element_offset,
b.element_length,
b.element_encode_type,
nvl(b.element_align, 'l') element_align,
b.record_type,
nvl(b.mask, 'lh') mask,
b.asn_type,
b.switch_type_id || '|' || b.package_level || '|' || b.package_id level_child,
b.switch_type_id || '|' || (b.package_level - 1) || '|' || b.parent_package_id level_parent
from switch_asn_record b
) tb
start with tb.level_parent like '%|0|-1'
connect by prior tb.level_child = tb.level_parent;
1、connect_by_isleaf是否是子節點；
2、sys_connect_by_path(tb.package_id, '|') ==> |***|***|***
3、start with tb.level_parent like '%|0|-1' ==> 樹的遍歷以從什麼開始
4、connect by prior tb.level_child = tb.level_parent; ==>此層遍歷之後，再將child作為parent，繼續往下遍歷
select t.*, t.rowid from tbgm_goods_category t
--遞迴查出指定id的所有上級節點
select lpad('',2*(level - 1), '') || gc.category_id as category_id,gc.trade_id,gc.parent_category_id
from tbgm_goods_category gc
connect by prior parent_category_id = category_id -- 找出所有dept_id等於當前記錄parent_id的記錄
start with category_id = 216 -- 從部門4開始遞迴查詢。
--遞迴查出指定id的所有子級節點
select lpad('',2*(level - 1), '')||gc.category_id as category_id,gc.trade_id,gc.parent_category_id,gc.category_depth
from tbgm_goods_category gc
where category_depth <= (select category_depth from tbgm_goods_category where category_id = 214)+1
connect by parent_category_id = prior category_id -- 找出所有parent_id等於當前記錄dept_id的記錄。
start with category_id = 214 -- 從部門2開始遞迴查詢。
oracle 9i中查詢乙個節點的所有制葉子節點
select
max(t.parent_category_id)keep(dense_rank last order by level)p,
max(t.category_id)keep(dense_rank last order by level)c,
max(t.category_name)keep(dense_rank last order by level)n
from tbgm_goods_category t
start with t.parent_category_id=259
connect by prior t.category_id=t.parent_category_id
--and prior child_type=/'special/'
group by rownum-level
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