select * from data where sn='1' and pq='ts' order by id desc limit 4
idsntspqvaluesystemts
20694289 1 ts 1558449040 1558449040 Tue 21 05 2019 16:30:40
20694280 1 ts 1558449023 1558449023 Tue 21 05 2019 16:30:23
20694273 1 ts 1558449019 1558449019 Tue 21 05 2019 16:30:19
20592746 1 ts 1558276240 1558276240 Sun 19 05 2019 16:30:40

Tue May 21 21:59:41 2019 by walley