Question

我有一个双时态表，我需要在每个月保持当前活动行和一个历史记录行。

如果行在月内重复，我需要删除这些行。

 Policy_ID  Customer_ID  Validity

  497201    304779902  ('05/06/16', HIGH END)

  540944    304779902  ('07/25/16', '07/30/16')

  541077    304779902  ('07/10/16', '07/24/16')

  541145    304779902  ('07/01/16', '07/10/16')

  541008    304779902  ('06/20/16', '07/01/16')

从上面一行我需要保留 Policy_ID Customer_ID有效性

  497201    304779902  ('05/06/16', HIGH END)

  540944    304779902  ('07/25/16', '07/30/16')

  541008    304779902  ('06/20/16', '07/01/16')

任何有助于执行此操作的特定命令。

Answer 1

要实际删除行，您需要删除NONTEMPORAL。最简单的方法是使用这样的临时表：

create volatile table src as
 ( select Policy_ID, Customer_ID, Validity
   from tab
   qualify
     row_number() -- find the rows to delete
     over (partition by Customer_ID order by Validity desc) > 2
 ) with data 
primary index (Customer_ID) -- should be the PI of the target table
on commit preserve rows;

nontemporal
delete from tab
where (Policy_ID, Customer_ID, Validity)
in ( select * from src)

如何从BiTemporal表中删除（物理删除）行

1 个答案: