$sql = "select a.id as max_id,a.uid from
(
SELECT
`uid`,
id
FROM
(`users_level_change_log`)
WHERE
`uid` IN (
".$uids_str."
)
AND `level_type` = 2
AND `create_time` < '{$now_month}'
order by id desc ) as a group by a.uid";
mysql子查询批量找id最大的
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转载自www.cnblogs.com/php-linux/p/9333714.html
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