更新行的最大值为

Question

我有这个SQL查询，这是错误的。我想更新wins表中的“prevmonth”字段，但仅限于字段“month_wins”具有最大值的记录。

UPDATE wins 
SET prevmonth_top=1 
WHERE month_wins = (SELECT MAX(month_wins) FROM wins) 

但我该怎么做？

Answer 1

试试这一招，

UPDATE wins 
SET prevmonth_top=1 
ORDER BY month_wins DESC 
LIMIT 1 

或这样的事情，

UPDATE IGNORE giveaways 
SET winner = 1 
WHERE month_wins = (select maxID from (SELECT MAX(ID) maxID FROM giveaways) as t) 

SAME AS You can't specify target table 'table_name' for update in FROM clause

Answer 2

运行下面的查询，它可以帮助：

UPDATE wins 
SET prevmonth_top=1 WHERE month_wins = 
(
     SELECT month_wins FROM (SELECT MAX(month_wins) FROM wins) AS month_wins 
)