select * from data where sn='ds0' and pq='hum' order by id desc limit 4
idsntspqvaluesystemts
20703150 ds0 hum 68.40 1558464208 Tue 21 05 2019 20:43:28
20703140 ds0 hum 68.40 1558464186 Tue 21 05 2019 20:43:06
20703124 ds0 hum 68.50 1558464164 Tue 21 05 2019 20:42:44
20703116 ds0 hum 68.30 1558464143 Tue 21 05 2019 20:42:23

Tue May 21 20:43:38 2019 by walley