SQL统计查询 两次group

直接贴上代码

select name,count(1) from (select name,mac from t_visitlog group by mac,name)t group by  order by count(1) desc;

这个需求时 统计不同的mac地址的不同name的个数

加个时间

 select name,count(1) from (
    select name,mac from t_visitlog where gettime like '2015-04-19%'
    group by mac,name)t group by  order by count(1) desc;