database - Postgres 到 Oracle 的翻译

Question

如何让这个 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;

提前致谢。

score 1 · Accepted Answer

看来您想使用连接执行更新，即UPDATE ... FROM. 这似乎没有直接支持，但可以使用UPDATE子查询来完成。

看：

score 0 · Accepted Answer

UPDATE teams
  SET (counter, task_counter) = (select counter, task_counter 
                                 FROM teams old
                                 WHERE old.is_old = 1 
                                   AND teams.name = old.name   
                                   AND teams.county = old.county)
where is_old = 0

这假定子选择将只为每个 name/county/is_old 组合返回一行。

score 0 · Accepted Answer

一种方便的 Oracle 技术是对这些棘手的更新使用 MERGE。

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

database - Postgres 到 Oracle 的翻译

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