記一個 order by group by

select * from
(SELECT
u.id,
u.mobile,
u.nickname,
u.sex,
u.country,
u.province,
u.city,
u.app,
u.channel,
u.createtime AS ucreatetime,
l.updatetime AS lastlogintime,
l.id as lid
FROM
user AS u
LEFT JOIN log AS l ON u.id = l.uid
ORDER BY u.id,l.id DESC
) tmp
GROUP BY tmp.id

user 表 ： log表 = 1：n
uid 關聯
查詢每個user的最後一次登錄的時間