select uid, datediff(select max(date(out_time)) from tb_user_log ,min(date(in_time)) ) as 今日与最早活跃日时间差, datediff(select max(date(out_time)) from tb_user_log ,max(date(in_time)) ) as 今日与最近活跃日时间差 from tb_user_log group by uid 这个语句当中为何不能出现date()函数?
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