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InfluxDb
cheat sheet / examples https://www.sqlpac.com/en/documents/influxdb-flux-language-advanced-features.html#influxdb-v2-quick-reminders
influxdb 3
from(bucket: "bucket") |> range(start: -2h) |> filter(fn: (r) => exists r.nas_name) // |> group(columns: ["nas_name","_measurment"]) |>last() |> yield(name: "unique")