sql语句，同时查询某记录的平均值，最大值，最小值及最大值时间，最小值时间。

select a.* , max_data1, data1_time , min_data2, data2_timefrom ( select username, avg(data1) as avg_data1, avg(data2) as avg_data2 from tb_table a group by username) as ajoin ( select username, data1 as