Numerical operators

The types int, long, and real represent numerical types. The following operators can be used between pairs of these types:

Operator	Description	Example
+	Add	3.14 + 3.14, ago(5m) + 5m
-	Subtract	0.23 - 0.22,
*	Multiply	1s * 5, 2 * 2
/	Divide	10m / 1s, 4 / 2
%	Modulo	4 % 2
<	Less	1 < 10, 10sec < 1h, now() < datetime(2100-01-01)
>	Greater	0.23 > 0.22, 10min > 1sec, now() > ago(1d)
==	Equals	1 == 1
!=	Not equals	1 != 0
<=	Less or Equal	4 <= 5
>=	Greater or Equal	5 >= 4
in	Equals to one of the elements	see here
!in	Not equals to any of the elements	see here

Note

To convert from one numerical type to another, use to*() functions. For example, see tolong() and toint().

Type rules for arithmetic operations

The data type of the result of an arithmetic operation is determined by the data types of the operands. If one of the operands is of type real, the result will be of type real. If both operands are of integer types (int or long), the result will be of type long.

Due to these rules, the result of division operations that only involve integers will be truncated to an integer, which might not always be what you want. To avoid truncation, convert at least one of the integer values to real using the todouble() before performing the operation.

The following examples illustrate how the operand types affect the result type in division operations.

Operation	Result	Description
1.0 / 2	0.5	One of the operands is of type real, so the result is real.
1 / 2.0	0.5	One of the operands is of type real, so the result is real.
1 / 2	0	Both of the operands are of type int, so the result is int. Integer division occurs and the decimal is truncated, resulting in 0 instead of 0.5, as one might expect.
real(1) / 2	0.5	To avoid truncation due to integer division, one of the int operands was first converted to real using the real() function.

Comment about the modulo operator

The modulo of two numbers always returns in Kusto a "small non-negative number". Thus, the modulo of two numbers, N % D, is such that: 0 ≤ (N % D) < abs(D).

For example, the following query:

print plusPlus = 14 % 12, minusPlus = -14 % 12, plusMinus = 14 % -12, minusMinus = -14 % -12

Produces this result:

plusPlus	minusPlus	plusMinus	minusMinus
2	10	2	10