Mathematical Operators

Warning! This page documents an old version of InfluxDB, which is no longer actively developed. InfluxDB v1.4 is the most recent stable version of InfluxDB.

Mathematical operators follow the standard order of operations. That is, parentheses take precedence to division and multiplication, which takes precedence to addition and substraction. For example 5 / 2 + 3 * 2 = (5 / 2) + (3 * 2) and 5 + 2 * 3 - 2 = 5 + (2 * 3) - 2.

Supported Operators

Addition

You can add a constant.

SELECT A + 5 FROM add

You can add together other field keys.

SELECT A + B FROM add

Subtraction

You can subtract a constant.

SELECT 1 - A FROM sub

You can subtract one field key from another field key.

SELECT A - B FROM sub

Multiplication

You can multiply by a constant.

SELECT 10 * A FROM mult

You can multiply by other field keys.

SELECT A * B * C FROM mult

Multiplication distributes across other operators

SELECT 10 * (A + B + C) FROM mult
SELECT 10 * (A - B - C) FROM mult
SELECT 10 * (A + B - C) FROM mult

Division

You can divide by a constant.

SELECT 10 / A FROM div

You can divide by other field keys.

SELECT A / B FROM div

Division distributes across other operators

SELECT 10 / (A + B + C) FROM mult

Operators with Functions

The use of mathematical operators inside of function calls is currently unsupported.

For example

SELECT 10 * mean(value) FROM cpu

will work, however

SELECT mean(10 * value) FROM cpu

will yield a parse error.

Unsupported Operators

Inequalities

Using any of =,!=,<,>,<=,>=,<> in the SELECT clause yields empty results for all types. See GitHub issue 3525.

Miscellaneous

Using any of %, ^ will yield a parse error. If you would like to see support for these operators open an issue.

Logical Operators are Unsupported

Using any of &,|,!|,NAND,XOR,NOR will yield parse error.

Additionally using AND, OR in the SELECT clause of a query will not behave as mathematical operators and simply yield empty results, as they are tokens in InfluxQL.