Arithmetic Operators

CQL supports the following operators:

Operator	Description
- (unary)	Negates operand
+	Addition
-	Substraction
*	Multiplication
/	Division
%	Returns the remainder of a division

Number Arithmetic

All arithmetic operations are supported on numeric types or counters.

The return type of the operation will be based on the operand types:

left/right	tinyint	smallint	int	bigint	counter	float	double	varint	decimal
tinyint	tinyint	smallint	int	bigint	bigint	float	double	varint	decimal
smallint	smallint	smallint	int	bigint	bigint	float	double	varint	decimal
int	int	int	int	bigint	bigint	float	double	varint	decimal
bigint	bigint	bigint	bigint	bigint	bigint	double	double	varint	decimal
counter	bigint	bigint	bigint	bigint	bigint	double	double	varint	decimal
float	float	float	float	double	double	float	double	decimal	decimal
double	double	double	double	double	double	double	double	decimal	decimal
varint	varint	varint	varint	decimal	decimal	decimal	decimal	decimal	decimal
decimal	decimal	decimal	decimal	decimal	decimal	decimal	decimal	decimal	decimal

*, / and % operators have a higher precedence level than + and - operator. By consequence, they will be evaluated before. If two operator in an expression have the same precedence level, they will be evaluated left to right based on their position in the expression.

Datetime Arithmetic

A duration can be added (+) or substracted (-) from a timestamp or a date to create a new timestamp or date. So for instance:

SELECT * FROM myTable WHERE t = '2017-01-01' - 2d

will select all the records with a value of t which is in the last 2 days of 2016.