select * from data where sn='ds1' order by id desc limit 4
idsntspqvaluesystemts
22759879 ds1 temp 20.19 1563675670 Sun 21 07 2019 04:21:10
22759868 ds1 temp 20.19 1563675648 Sun 21 07 2019 04:20:48
22759855 ds1 temp 20.19 1563675627 Sun 21 07 2019 04:20:27
22759844 ds1 temp 20.19 1563675605 Sun 21 07 2019 04:20:05

Sun Jul 21 04:21:29 2019 by walley