Mathematical Operators

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

SELECT * FROM add WHERE A + 5 > 10

You can add together other field keys.

SELECT A + B FROM add

SELECT * FROM add WHERE A + B >= 10

Subtraction

You can subtract a constant.

SELECT 1 - A FROM sub

SELECT * FROM sub WHERE 1 - A <= 3

You can subtract one field key from another field key.

SELECT A - B FROM sub

SELECT * FROM sub WHERE A - B <= 1

Multiplication

You can multiply by a constant.

SELECT 10 * A FROM mult

SELECT * FROM mult WHERE A * 10 >= 20

You can multiply by other field keys.

SELECT A * B * C FROM mult

SELECT * FROM mult WHERE A * B <= 80

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

SELECT * FROM div WHERE A / 10 <= 2

You can divide by other field keys.

SELECT A / B FROM div

SELECT * FROM div WHERE A / B >= 10

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. Note that InfluxDB only allows functions in the SELECT clause.

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.