select * from data where sn='12250' order by id desc limit 4
idsntspqvaluesystemts
29378612 12250 temp 23.00 1576443902 Sun 15 12 2019 22:05:02
29378425 12250 temp 23.12 1576443602 Sun 15 12 2019 22:00:02
29378222 12250 temp 23.25 1576443302 Sun 15 12 2019 21:55:02
29378016 12250 temp 22.94 1576443002 Sun 15 12 2019 21:50:02

Sun Dec 15 22:06:30 2019 by walley