Oracle更新查詢 - 兩個表的連接

Question

我有兩個表，一個父表和一個子表。孩子將有許多行parent_id。這兩個表都有狀態欄。可能的值是「活動」和「已刪除」。

我想這樣做。如果對於父母標識，所有孩子都有刪除狀態，則必須將父母也標記爲從活動狀態中刪除。它可以在單個更新查詢中完成嗎？

在此先感謝。

Answer 1

這樣的事情呢？

UPDATE parent_table pt SET deleted = 'Y' WHERE deleted = 'N' AND id NOT IN 
    (SELECT parent_id FROM child_table ct WHERE deleted = 'N' AND ct.parent_id = pt.id) 

Answer 2

是：

update parent 
    set status = 'Deleted' 
where status = 'Active' 
    and not exists (select null from child 
        where child.id = parent.id 
         and child.status <> 'Deleted') 

Answer 3

UPDATE parent_table 
set status = 'deleted' 
WHERE status = 'active' 
    AND id in (
       SELECT parent_id 
       FROM (
        SELECT 
          parent_id 
          , count(*)           total 
          , sum (CASE staus WHEN 'deleted' THEN 1 ELSE 0 END) deleted 
        FROM child_table 
        group by parent_id 
      ) 
       WHERE total = deleted 
      )