数据库中的递归查询

最近工作中用到了递归查询,顺便做下备忘:

1. SQL2005中的CTE查询:

 

WITH CTE(AAAAA,BBBBB,CCCCC) 
AS(
 
    -- 查询ID为411321150的数据
    SELECT id as AAAAA,parent as BBBBB,name  as CCCCC
    FROM RegionInfo  WHERE id='456789150' 
     
    UNION ALL
    
    -- 连接前面查询结果并进行递归    
    SELECT R.id as AAAAA, R.parent as BBBBB, R.name as CCCCC
    FROM RegionInfo as R 
    INNER JOIN  CTE C
    ON C.BBBBB=R.id 
)
SELECT  AAAAA, BBBBB,  CCCCC  
FROM CT

 原表中数据为:

查询结果为:

2.ORACLE中的递归:

  SELECT   menuid,parentsid,menuname 
  FROM  AC_MENU 
  START WITH parentsid='operorgManage' 
  CONNECT BY PRIOR menuid=parentsid

  原表中数据为:

 

 查询结果为: