如何獲取列的值並更新單個查詢中的另一列？

Question

如何在執行此查詢時將_displayed設置爲1？

select message 
from commands 
where whether_executed=1 
and whether_displayed=0 
and from_who='".$user_id."' 
LIMIT 1 

Answer 1

在這之後，你可以像這樣運行

UPDATE commands SET whether_displayed=1 
WHERE whether_executed=1 
AND from_who='".$user_id."' 

更新查詢或本

UPDATE commands 
SET whether_displayed=1 
WHERE message IN (
SELECT message FROM (
    SELECT message FROM commands 
    where whether_executed=1 
    and whether_displayed=0 
    and from_who='".$user_id."' 
    LIMIT 1 
) tmp 
); 

Answer 2

嘗試這樣

UPDATE commands SET whether_displayed= '1' 
    WHERE from_who='".$user_id."' = (
      SELECT from_who 
      FROM commands 
      where whether_executed=1 
      LIMIT 1 
     ); 

一些額外的線路或改變該查詢需要根據您的需要