select * from data where sn='max0' and pq='volt' order by id desc limit 4
idsntspqvaluesystemts
4696058 max0 volt 14.648 1501373182 Sun 30 07 2017 02:06:22
4696042 max0 volt 14.136 1501373122 Sun 30 07 2017 02:05:22
4696017 max0 volt 14.233 1501373061 Sun 30 07 2017 02:04:21
4695998 max0 volt 14.185 1501373000 Sun 30 07 2017 02:03:20

Mon Oct 21 05:09:38 2019 by walley