select * from data where sn='221' and pq='hum' order by id desc limit 4
idsntspqvaluesystemts
22759235 221 hum 46.40 1563674556 Sun 21 07 2019 04:02:36
22759229 221 hum 46.60 1563674555 Sun 21 07 2019 04:02:35
22759221 221 hum 46.70 1563674536 Sun 21 07 2019 04:02:16
22759210 221 hum 46.50 1563674516 Sun 21 07 2019 04:01:56

Sun Jul 21 04:03:22 2019 by walley