select * from data where sn='ds1' order by id desc limit 4
idsntspqvaluesystemts
39737596 ds1 temp 18.87 1594696209 Tue 14 07 2020 05:10:09
39737577 ds1 temp 18.87 1594696187 Tue 14 07 2020 05:09:47
39737565 ds1 temp 18.87 1594696165 Tue 14 07 2020 05:09:25
39737548 ds1 temp 18.87 1594696143 Tue 14 07 2020 05:09:03

Tue Jul 14 05:10:11 2020 by walley