WHERE clause

Use the WHERE clause to filter data based on field values, tag values, and timestamps.

• Syntax
• Operators
  • Comparison operators
  • Logical operators
• Time ranges
• Regular expressions
• WHERE clause examples
• Notable behaviors
  • Single and double quotes
  • Cannot query multiple time ranges

Syntax

SELECT_clause FROM_clause WHERE <conditional_expression> [(AND|OR) <conditional_expression> [...]]

• conditional_expression: Comparison between two operands that evaluates to true or false. Comparison logic is determined by operators used in the expression. These expressions can operate on InfluxDB fields, tags, and timestamps. Use logical operators (AND, OR) to chain multiple conditional expressions together.

Operators

Operators evaluate the relationship between two operands and return true or false.

Comparison operators

Logical operators

Time ranges

Use the WHERE clause to specify a time range to query. If a time range isn’t specified in the WHERE clause, the default time range is used.

Timestamps are stored in the time column. Use comparison operators to compare the value of the time column to a timestamp literal, integer (Unix nanosecond timestamp), or expression.

WHERE
  time >= '2023-01-01T00:00:00Z'
  AND time < '2023-07-01T00:00:00Z'

WHERE
  time >= 1672531200000000000
  AND time < 1688169600000000000

WHERE
  time >= now() - 1d
  AND time < now()

See Time syntax for information on how to specify alternative time ranges in the WHERE clause.

Regular expressions

Regular expressions can be used to evaluate string values in the WHERE clause using regular expression comparison operators:

• =~: Matches a regular expression
• !~: Doesn’t match a regular expression

SELECT * FROM home WHERE room =~ /^K/

For more information about InfluxQL regular expression syntax, see InfluxQL regular expressions.

WHERE clause examples

The following examples use the Home sensor sample dataset.

SELECT * FROM home WHERE room = 'Living Room'

SELECT *
FROM home
WHERE
  time >= '2022-01-01T08:00:00Z'
  AND time <= '2022-01-01T10:00:00Z'

SELECT * FROM home WHERE time >= '2022-01-01T20:00:00Z' - 2h

SELECT co FROM home WHERE co > 9

SELECT room, co FROM home WHERE co = 9

SELECT room, co FROM home WHERE co - 10 > 5

SELECT * FROM home WHERE temp > 22.7 AND room = 'Kitchen'

SELECT co, temp FROM home WHERE co > temp

Notable behaviors

• Single and double quotes
• Cannot query multiple time ranges

Single and double quotes

In InfluxQL, single quotation marks (') and double quotation marks (") work differently and can alter the way a WHERE clause functions. Single quotes are used in string and timestamp literals. Double quotes are used to quote identifiers, (time, field, and tag column names).

For example, the following conditional expression compares the value of the location column to the literal string, London:

"location" = 'London'

The following conditional expression compares the value of the location column to the value of the London column:

"location" = "London"

Misused double and single quotes in the WHERE clause often results in unexpected empty query results. For more information about quotation marks, see InfluxQL quotation.

Cannot query multiple time ranges

InfluxDB does not support using OR in the WHERE clause to query multiple time ranges. For example, the following query returns no results:

SELECT *
FROM home
WHERE
  (time >= '2022-01-01T08:00:00Z' AND time <= '2022-01-01T10:00:00Z')
  OR (time >= '2022-01-01T18:00:00Z' AND time <= '2022-01-01T20:00:00Z')