Database 甲骨文翻译博士后

如何将此Postgres语句解析为Oracle 11g

UPDATE teams as new 
  SET counter=old.counter, 
      task_counter=old.task_counter 
FROM teams as old
WHERE new.is_old=0 
  AND old.is_old=1 
  AND new.name=old.name 
  AND new.county=old.county;

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提前谢谢

您似乎希望使用联接执行更新，即

update。。。从

。这似乎不受直接支持，但可以使用带有子查询的

UPDATE

来完成

见：

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这假设子选择只会为每个名称/县/旧组合返回一行。

Oracle的一种简便技术是对这些棘手的更新使用合并

Merge into teams new 
From (
  Select counter,
         task_counter
  From   teams 
  Where  is_old = 1) old
On (new.is_old = 0          and
    new.name   = old.name   and
    new.county = old.county   )
when matched then update
set counter      = old.counter and
    task_counter = old.task_counter

---

@莱奥拉：你为什么认为这是一个触发器？

Merge into teams new 
From (
  Select counter,
         task_counter
  From   teams 
  Where  is_old = 1) old
On (new.is_old = 0          and
    new.name   = old.name   and
    new.county = old.county   )
when matched then update
set counter      = old.counter and
    task_counter = old.task_counter