如何删除InfluxDB中除最后一条记录外的所有测量记录？

Question

I searched for answer all day and found influxdb hasn't '''IN''' like SQL. so can influxdb do like

DELETE  
FROM tablename 
WHERE column1 NOT IN (SELECT column1 FROM tablename order by column1 desc LIMIT 1 OFFSET 0)

I have no idea.

Answer 1

Everything possible with InfluxQL is specified here . InfluxQL does not support IN operator currently.

This is one of the approaches may help you to solve your issue:

• Copy the latest record to a file
• Delete records from measurement
• Insert back to the measurement from the saved file

EDIT

As @Nikolay Manolov mentioned in comment, you can find the timestamp of latest record and delete everything that is older than that.