oracle connect by 遞迴,反遞迴,自動補全查詢實現

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標籤:desc   from   oracle   log   div   遞迴   class   sel   with   

遞迴:

select *
    from t_pams_solution t
   start with t.id is null
  connect by prior id = t.parent_id
   order by level desc

紅字部分分別為 表名,開始條件,子節點與根關聯條件

反遞迴:

select rownum num,
         level lev,
         connect_by_root(id) id,
         connect_by_root(solution_name) name
    from t_pams_solution t
   where t.id = 23379
   start with 1 = 1
  connect by prior id = t.parent_id
   order by level desc

紅字部分分別為 表名,開始條件,子節點與根關聯條件

自動補全查詢:

select level from dual
connect by level <10

oracle connect by 遞迴,反遞迴,自動補全查詢實現

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