Use LIMIT and SLIMIT to limit the number of points and series returned per query.
LIMIT clause
LIMIT <N> returns the first N points from the specified measurement.
Syntax
SELECT_clause FROM_clause [WHERE_clause] [GROUP_BY_clause] [ORDER_BY_clause] LIMIT <N>
N specifies the number of points to return from the specified measurement . If N is greater than the number of points in a measurement, InfluxDB returns all points from the measurement.
IMPORTANT: The LIMIT clause must appear in the order outlined in the syntax above.
Examples
Limit the number of points returned
SELECT "water_level","location" FROM "h2o_feet" LIMIT 3
Output:
| time | water_level | location |
|---|
| 2019-08-17T00:00:00Z | 8.1200000000 | coyote_creek |
| 2019-08-17T00:00:00Z | 2.0640000000 | santa_monica |
| 2019-08-17T00:06:00Z | 8.0050000000 | coyote_creek |
The query returns the three oldest points, determined by timestamp, from the h2o_feet measurement.
Limit the number of points returned and include a GROUP BY clause
SELECT MEAN("water_level") FROM "h2o_feet" WHERE time >= '2019-08-18T00:00:00Z' AND time <= '2019-08-18T00:42:00Z' GROUP BY *,time(12m) LIMIT 2
Output:
| time | mean |
|---|
| 2019-08-18T00:00:00Z | 8.4615000000 |
| 2019-08-18T00:12:00Z | 8.2725000000 |
| time | mean |
|---|
| 2019-08-18T00:00:00Z | 2.3655000000 |
| 2019-08-18T00:12:00Z | 2.3360000000 |
This query uses the InfluxQL MEAN() function and a GROUP BY clause to calculate the average water_level for each tag and for each 12-minute interval in the queried time range. LIMIT 2 requests the two oldest 12-minute averages (determined by timestamp).
Note that without LIMIT 2, the query would return four points per series; one for each 12-minute interval in the queried time range.
SLIMIT clause
SLIMIT <N> returns every point from N series in the specified measurement.
Syntax
SELECT_clause FROM_clause [WHERE_clause] GROUP BY *[,time(<time_interval>)] [ORDER_BY_clause] SLIMIT <N>
N specifies the number of series to return from the specified measurement. If N is greater than the number of series in a measurement, InfluxDB returns all series from that measurement.
SLIMIT queries must include GROUP BY *. Note that the SLIMIT clause must appear in the order outlined in the syntax above.
Examples
Limit the number of series returned
SELECT "water_level" FROM "h2o_feet" GROUP BY * SLIMIT 1
Output:
| time | water_level |
|---|
| 2019-08-17T00:00:00Z | 8.1200000000 |
| 2019-08-17T00:06:00Z | 8.0050000000 |
| 2019-08-17T00:12:00Z | 7.8870000000 |
| 2019-08-17T00:18:00Z | 7.7620000000 |
| 2019-08-17T00:24:00Z | 7.6350000000 |
| 2019-08-17T00:30:00Z | 7.5000000000 |
| 2019-08-17T00:36:00Z | 7.3720000000 |
The results above include only the first few rows, as the data set is quite large. The query returns all water_level points from one of the series associated with the h2o_feet measurement.
Limit the number of series returned and include a GROUP BY time() clause
SELECT MEAN("water_level") FROM "h2o_feet" WHERE time >= '2019-08-18T00:00:00Z' AND time <= '2019-08-18T00:42:00Z' GROUP BY *,time(12m) SLIMIT 1
Output:
| time | mean |
|---|
| 2019-08-18T00:00:00Z | 8.4615000000 |
| 2019-08-18T00:12:00Z | 8.2725000000 |
| 2019-08-18T00:24:00Z | 8.0710000000 |
| 2019-08-18T00:36:00Z | 7.8330000000 |
The query uses the InfluxQL MEAN() function
and a time interval in the GROUP BY clause
to calculate the average water_level for each 12-minute
interval in the queried time range.
SLIMIT 1 requests a single series associated with the h2o_feet measurement.
Note that without SLIMIT 1, the query would return results for the two series
associated with the h2o_feet measurement: location=coyote_creek and
location=santa_monica.
Use LIMIT and SLIMIT together
LIMIT <N> followed by SLIMIT <2> returns the first N1 points from N2 series in the specified measurement.
Syntax
SELECT_clause FROM_clause [WHERE_clause] GROUP BY *[,time(<time_interval>)] [ORDER_BY_clause] LIMIT <N1> SLIMIT <N2>
N1 specifies the number of points to return per measurement. If N1 is greater than the number of points in a measurement, InfluxDB returns all points from that measurement.
N2 specifies the number of series to return from the specified measurement. If N2 is greater than the number of series in a measurement, InfluxDB returns all series from that measurement.
SLIMIT queries must include GROUP BY *. Note that the SLIMIT clause must appear in the order outlined in the syntax above.
Examples
Limit the number of points and series returned
SELECT "water_level" FROM "h2o_feet" GROUP BY * LIMIT 3 SLIMIT 1
Output:
| time | water_level |
|---|
| 2019-08-17T00:00:00Z | 8.1200000000 |
| 2019-08-17T00:06:00Z | 8.0050000000 |
| 2019-08-17T00:12:00Z | 7.8870000000 |
The query returns the three oldest points, determined by timestamp, from one of the series associated with the measurement h2o_feet.
Limit the number of points and series returned and include a GROUP BY time() clause
SELECT MEAN("water_level") FROM "h2o_feet" WHERE time >= '2019-08-18T00:00:00Z' AND time <= '2019-08-18T00:42:00Z' GROUP BY *,time(12m) LIMIT 2 SLIMIT 1
Output:
| time | mean |
|---|
| 2019-08-18T00:00:00Z | 8.4615000000 |
| 2019-08-18T00:12:00Z | 8.2725000000 |
The query uses the InfluxQL function MEAN() and a time interval in the GROUP BY clause to calculate the average water_level for each 12-minute interval in the queried time range. LIMIT 2 requests the two oldest 12-minute averages (determined by
timestamp) and SLIMIT 1 requests a single series associated with the h2o_feet measurement.
Note that without LIMIT 2 SLIMIT 1, the query would return four points for each of the two series associated with the h2o_feet measurement.
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