oracle CONNECT_BY_ROOT 在组内搜索

Question

给定如下table

   KID   | CROSS_LINK |  KEY   | GROUP_KEY 
 --------|------------|--------|----------- 
  COR001 |            | 711768 |    336406 
  EXP001 |            | 740194 |    336406 
  POD002 | DPR002     | 712408 |    336406 
  POD003 | POD002     | 718445 |    336406 
  DPR001 |            | 711825 |    336406 
  TRC001 |            | 713773 |    336406 
  DPR002 |            | 712199 |    336406 
  POD001 | DPR001     | 712191 |    336406 
  POD004 | POD001     | 815174 |    336406 
  POD005 | POD003     | 815181 |    336406 
  POD002 | DPR001     | 478800 |    475873 
  POD005 | POD002     | 300266 |    475873 
  DPR001 |            | 300202 |    475873

我的sql声明是

select level lvl, kid,  CONNECT_BY_ROOT CROSS_LINK  as father, key, group_key 
 from  t
start with CROSS_LINK is not null
CONNECT BY PRIOR  kid =  CROSS_LINK
order by  GROUP_KEY

您可以将 CROSS_LINK 视为父列。我的目标是在 GROUP_KEY .

中显示 KID 的所有父亲（层次结构中的直接和间接）

此查询不以孤立的方式运行在 GROUP_KEY 中。您可以在 KID 'POD005' 的行为中观察到问题。在下图中，我突出显示了错误的行。

Answer 1

向您的 CONNECT BY 子句添加一个条件，以强制它只在与父行相同的 GROUP_KEY 中找到子项。

select level lvl, kid,  CONNECT_BY_ROOT CROSS_LINK  as father, key, group_key 
from  t
start with CROSS_LINK is not null
CONNECT BY PRIOR  kid =  CROSS_LINK
AND PRIOR group_key = group_key
order by  GROUP_KEY

oracle CONNECT_BY_ROOT 在组内搜索

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