select * from data where sn='ds0' and pq='hum' order by id desc limit 4
idsntspqvaluesystemts
18877406 ds0 hum 51.60 1553491374 Mon 25 03 2019 06:22:54
18877389 ds0 hum 51.60 1553491352 Mon 25 03 2019 06:22:32
18877377 ds0 hum 51.60 1553491330 Mon 25 03 2019 06:22:10
18877365 ds0 hum 51.50 1553491309 Mon 25 03 2019 06:21:49

Mon Mar 25 06:23:15 2019 by walley