Select

Use the SELECT statement to query data from an InfluxDB measurement. The SELECT clause is required when querying data in SQL.

• Syntax
• Examples

Syntax

SELECT a, b, "time" FROM <measurement>

The SELECT clause supports the following:

• SELECT * - return all tags, fields and timestamps.
• SELECT DISTINCT to return all distinct (different) values.
• SELECT <"field" or "tag"> - returns a specified field or tag.
• SELECT <"field" or "tag">, <"field" or "tag"> - returns more than one tag or field.
• SELECT <"field"> AS a - return the field as the alias.

Examples

The following examples use data from the NOAA database. To download the NOAA test data see NOAA water sample data.

Select all fields and tags from a measurement

SELECT * FROM h2o_feet LIMIT 10

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Select specific tags and fields from a measurement

SELECT "location", "water_level" FROM "h2o_feet"

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Select a field, tag and timestamp from a measurement

SELECT "water_level", "location", "time" FROM "h2o_feet"

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Select a field and perform basic arithmetic

The following query takes the value of water_level, multiplies it by 3 and adds 5 to the result.

SELECT ("water_level" * 3) + 5 FROM "h2o_feet"

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