8.1 KiB
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LIMIT and SLIMIT clauses | Use `LIMIT` to limit the number of **rows** returned per InfluxQL group. Use `SLIMIT` to limit the number of [series](/influxdb/cloud-dedicated/reference/glossary/#series) returned in query results. |
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206 | ```sql SELECT_clause FROM_clause [WHERE_clause] [GROUP_BY_clause] [ORDER_BY_clause] LIMIT row_N SLIMIT series_N ``` |
Use LIMIT
to limit the number of rows returned per InfluxQL group.
Use SLIMIT
to limit the number of series
returned in query results.
LIMIT clause
The LIMIT
clause limits the number of rows to return from each InfluxQL group.
If the query doesn't include a GROUP BY
clause,
the entire result set is considered a single group.
If a query groups data by time,
limits are applied after aggregate and selector operations are applied to each
time window.
Syntax
SELECT_clause FROM_clause [WHERE_clause] [GROUP_BY_clause] [ORDER_BY_clause] LIMIT N
Arguments
- N: Maximum number of points to return from each InfluxQL group.
If
N
is greater than the number of points in a group, all points from the group are returned.
Examples
The following examples use the Get started home sensor sample data.
{{< expand-wrapper >}}
{{% expand "Limit the number of rows returned" %}}
SELECT * FROM home LIMIT 3
{{% influxql/table-meta %}} Name: home {{% /influxql/table-meta %}}
{{% influxdb/custom-timestamps %}}
time | co | hum | room | temp |
---|---|---|---|---|
2022-01-01T08:00:00Z | 0 | 35.9 | Kitchen | 21 |
2022-01-01T08:00:00Z | 0 | 35.9 | Living Room | 21.1 |
2022-01-01T09:00:00Z | 0 | 36.2 | Kitchen | 23 |
{{% /influxdb/custom-timestamps %}} {{% /expand %}}
{{% expand "Limit the number of rows returned from each InfluxQL group" %}}
SELECT
MEAN(*)
FROM home
GROUP BY
time(2h),
room
LIMIT 3
{{% influxdb/custom-timestamps %}}
{{% influxql/table-meta %}}
name: home
tags: room=Kitchen
{{% /influxql/table-meta %}}
time | mean_co | mean_hum | mean_temp |
---|---|---|---|
2022-01-01T08:00:00Z | 0 | 36.05 | 22 |
2022-01-01T10:00:00Z | 0 | 36.05 | 22.549999999999997 |
2022-01-01T12:00:00Z | 0.5 | 36.25 | 22.65 |
{{% influxql/table-meta %}}
name: home
tags: room=Living Room
{{% /influxql/table-meta %}}
time | mean_co | mean_hum | mean_temp |
---|---|---|---|
2022-01-01T08:00:00Z | 0 | 35.9 | 21.25 |
2022-01-01T10:00:00Z | 0 | 36 | 22 |
2022-01-01T12:00:00Z | 0 | 35.95 | 22.299999999999997 |
{{% /influxdb/custom-timestamps %}} {{% /expand %}}
{{< /expand-wrapper >}}
SLIMIT clause
{{% warn %}}
InfluxQL is being rearchitected to work with the InfluxDB 3.0 storage engine.
This process is ongoing and some InfluxQL features, such as SLIMIT
are still
being implemented. For more information, see
InfluxQL feature support.
{{% /warn %}}