select * from data where sn='meteo2' order by id desc limit 4
idsntspqvaluesystemts
20703058 meteo2 temp 15.56 1558462253 Tue 21 05 2019 20:10:53
20703057 meteo2 temp 15.56 1558461652 Tue 21 05 2019 20:00:52
20703056 meteo2 temp 15.56 1558461052 Tue 21 05 2019 19:50:52
20703055 meteo2 temp 15.63 1558460451 Tue 21 05 2019 19:40:51

Tue May 21 20:51:57 2019 by walley