select * from data where sn='ds0' and pq='hum' order by id desc limit 4
idsntspqvaluesystemts
29378693 ds0 hum 42.20 1576443934 Sun 15 12 2019 22:05:34
29378681 ds0 hum 42.20 1576443911 Sun 15 12 2019 22:05:11
29378669 ds0 hum 42.10 1576443890 Sun 15 12 2019 22:04:50
29378647 ds0 hum 42.10 1576443868 Sun 15 12 2019 22:04:28

Sun Dec 15 22:05:42 2019 by walley