I have that Graph:
SELECT mean(“value”) FROM “Volumen_OelTank” WHERE $timeFilter GROUP BY time($interval) fill(null)
which shows the Volume of my tank. Now I’d like to see how much I use like every day or every week. So I like to show the difference between a value and the value one day/7days ago.
How do I have to formulate that?
I use Influxdb as input data.
Thanks for your help,