Question

我有一张表del

 CMPI_CODE CMPI_ID_REF
---------- -----------
        51             
        52          51 
        53             
        54             
        55             
        56             
        57             
        58             
        59             
        60             
        61             
        62             
        81             
        82          61 
        83             
        84

-

WITH RSFC(A,B,LVL) AS 
  (SELECT CMPI_CODE,CMPI_ID_REF,0 AS LVL FROM del R where CMPI_ID_REF is null
  UNION ALL SELECT A,B,LVL+1 FROM RSFC R
  INNER JOIN DEL F ON R.A = F.CMPI_ID_REF
  ) 
  select * from rsfc

这就像显示错误SQL Error: ORA-32044: cycle detected while executing recursive WITH query

Answer 1

您似乎在递归成员中选择了错误的值。仅查看前两行，锚成员将A, B, LVL作为51, null, 0。第一个递归成员将使用51来获取第二行;但是你选择了A, B, LVL+1，这样就会得到51, null, 1。然后下一个会得到相同的...因此循环。所以你需要选择：

  UNION ALL SELECT F.CMPI_CODE,CMPI_ID_REF,LVL+1 FROM RSFC R
  INNER JOIN DEL F ON R.A = F.CMPI_ID_REF

SQL Fiddle基于你的。不确定这是否是您想要的最终结果。

Answer 2

~~Oracle不使用与Sql server相同的语法进行分层查询，而WITH关键字则用于不同的用途。~~

进行分层查询使用以下查询：

SELECT DEL.*, level as LVL
FROM
    DEL 
CONNECT BY PRIOR
    CMPI_CODE = CMPI_ID_REF
START WITH
    CMPI_ID_REF IS NULL;

oracle中的CTE循环错误

2 个答案: