试试这个技巧
UPDATE wins
SET prevmonth_top=1
ORDER BY month_wins DESC
LIMIT 1
或类似的东西，
UPDATE IGNORE giveaways
SET winner = 1
WHERE month_wins = (select maxID from (SELECT MAX(ID) maxID FROM giveaways) as t)
更新具有一个字段的当前最高（最大值）值的行
更新具有一个字段的当前最高（最大值）值的行
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