select * from data where sn='ds0' order by id desc limit 4
idsntspqvaluesystemts
18877197 ds0 temp 16.10 1553491013 Mon 25 03 2019 06:16:53
18877196 ds0 hum 51.60 1553491013 Mon 25 03 2019 06:16:53
18877176 ds0 temp 16.20 1553490992 Mon 25 03 2019 06:16:32
18877175 ds0 hum 52.20 1553490992 Mon 25 03 2019 06:16:32

Mon Mar 25 06:17:10 2019 by walley