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Sort and limit data with Flux | Sort and limit data in InfluxDB with Flux | Sort and limit | Use the `sort()`function to order records within each table by specific columns and the `limit()` function to limit the number of records in output tables to a fixed number, `n`. |
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3 | sort_limit | /influxdb/v2/query-data/flux/sort-limit/ |
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Use the sort()
function
to order records within each table by specific columns and the
limit()
function
to limit the number of records in output tables to a fixed number, n
.
If you're just getting started with Flux queries, check out the following:
- Get started with Flux for a conceptual overview of Flux and parts of a Flux query.
- Execute queries to discover a variety of ways to run your queries.
Example sorting system uptime
The following example orders system uptime first by region, then host, then value.
from(bucket:"db/rp")
|> range(start:-12h)
|> filter(fn: (r) =>
r._measurement == "system" and
r._field == "uptime"
)
|> sort(columns:["region", "host", "_value"])
The limit()
function
limits the number of records in output tables to a fixed number, n
.
The following example shows up to 10 records from the past hour.
from(bucket:"db/rp")
|> range(start:-1h)
|> limit(n:10)
You can use sort()
and limit()
together to show the top N records.
The example below returns the 10 top system uptime values sorted first by
region, then host, then value.
from(bucket:"db/rp")
|> range(start:-12h)
|> filter(fn: (r) =>
r._measurement == "system" and
r._field == "uptime"
)
|> sort(columns:["region", "host", "_value"])
|> limit(n:10)
You now have created a Flux query that sorts and limits data.
Flux also provides the top()
and bottom()
functions to perform both of these functions at the same time.