如何將多個值從選擇的子查詢

Question

嗨，我有下面的查詢問題存儲：

Update tbl 
set somecol = somecol 
Where Key = (select key 
      from tbl 
      group by key 
      having count(*) > 1) 
    and Time = (select max(time) from tbl) 

上述查詢工作正常時，只有一個密鑰。但是，如果有多個鍵比這個查詢不起作用。如何從選擇子查詢存儲多個值？時間列也可以是多個。我是新來的sql。請指導。提前致謝。

Answer 1

使用IN斷言：

Update tbl 
set somecol = somecol 
Where Key in (select key 
      from tbl 
      group by key 
      having count(*) > 1) 
    and Time = (select max(time) from tbl) 

Answer 2

嘗試以下操作：

Update tbl 
set somecol = somecol 
Where Key in (select key 
      from tbl 
      group by key 
      having count(*) > 1) 
    and Time in (select max(time) from tbl) 

根據要求，你也可以使用派生表。