查询每分钟里最大的

# 时间格式为 2019-01-01 12:11:10
select date_format(reserve_time,'%Y%m%d %H%i') as minute, count(*) as number from t_rush_buy_event_records where event_id = ? group by minute order by count(1) desc limit 1

# 表中记录的时间格式为时间戳
select from_unixtime(milli_draw_time,'%Y%m%d %H%i') as minute, count(*) as number from t_rush_buy_event_records where event_id = ? and type = 2 group by minute order by count(1) desc limit 1