select * from data where sn='12250' order by id desc limit 4
idsntspqvaluesystemts
27201443 12250 temp 24.38 1571625302 Mon 21 10 2019 04:35:02
27201366 12250 temp 24.38 1571625002 Mon 21 10 2019 04:30:02
27201290 12250 temp 24.38 1571624702 Mon 21 10 2019 04:25:02
27201210 12250 temp 24.38 1571624402 Mon 21 10 2019 04:20:02

Mon Oct 21 04:34:41 2019 by walley