Query data with SQL
Learn to query data stored in InfluxDB using SQL.
- Explore your schema with SQL
- Perform a basic SQL query
- Aggregate data with SQL
- Cast values to different types
- Fill gaps in data
- Use parameterized queries with SQL
Explore your schema with SQL
When working with InfluxDB’s implementation of SQL, a measurement is structured as a table, and time, fields, and tags are structured as columns.
List measurements
SHOW TABLES
List columns in a measurement
SHOW COLUMNS IN measurement
Perform a basic SQL query
A basic SQL query that queries data from InfluxDB most commonly includes SELECT, FROM, and WHERE clauses.
SELECT temp, room FROM home WHERE time >= now() - INTERVAL '1 day'
Aggregate data with SQL
Use aggregate and selector functions to perform aggregate operations on your time series data.
Aggregate fields by groups
SELECT
mean(field1) AS mean,
selector_first(field2)['value'] as first,
tag1
FROM home
GROUP BY tag
Aggregate by time-based intervals
SELECT
DATE_BIN(INTERVAL '1 hour', time, '2022-01-01T00:00:00Z'::TIMESTAMP) AS time,
mean(field1),
sum(field2),
tag1
FROM home
GROUP BY 1, tag1
Cast values to different types
Use the CAST function or double-colon :: casting shorthand syntax to cast a value to a specific type.
-- CAST clause
SELECT CAST(1234.5 AS BIGINT)
-- Double-colon casting shorthand
SELECT 1234.5::BIGINT
Fill gaps in data
Use date_bin_gapfill with interpolate or locf to fill gaps of time where no data is returned.
SELECT
date_bin_gapfill(INTERVAL '30 minutes', time) as _time,
room,
interpolate(avg(temp))
FROM home
WHERE
time >= '2022-01-01T08:00:00Z'
AND time <= '2022-01-01T10:00:00Z'
GROUP BY _time, room
Use parameterized queries with SQL
Use parameterized queries to prevent injection attacks and make queries more reusable.
Using Go and the influxdb3-go client
// Use the $parameter syntax to reference parameters in a query.
// The following SQL query contains $room and $min_temp placeholders.
query := `
SELECT * FROM home
WHERE time >= $min_time
AND temp >= $min_temp
AND room = $room`
// Assign parameter names to input values.
parameters := influxdb3.QueryParameters{
"room": "Kitchen",
"min_temp": 20.0,
"min_time": "2024-03-18 00:00:00.00",
}
// Call the client's function to query InfluxDB with parameters.
iterator, err := client.QueryWithParameters(context.Background(), query, parameters)
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