Numeric Functions

rand

rand() returns a random floating point number in the range from 0 (inclusive) to 1 (exclusive); i.e.[0,1). The numbers returned follow an approximate uniform distribution.

Syntax: rand()

Returns:

A Float.

Query:

SELECT *
FROM cypher('graph_name', $$
    RETURN rand()
$$) as (r agtype);

A random number is returned.

Result:

abs

abs() returns the absolute value of the given number.

Syntax: abs(expression)

Returns:

The type of the value returned will be that of expression.

Arguments:

Considerations:

• abs(null) returns null.
• If expression is negative, -(expression) (i.e. the negation of expression) is returned.

Query:

SELECT *
FROM cypher('graph_name', $$
    MATCH (a), (e) WHERE a.name = 'Alice' AND e.name = 'Eskil'
    RETURN a.age, e.age, abs(a.age - e.age)
$$) as (alice_age agtype, eskil_age agtype, difference agtype);

The absolute value of the age difference is returned.

Result:

ceil

ceil() returns the smallest floating point number that is greater than or equal to the given number and equal to a mathematical integer.

Syntax: ceil(expression)

Returns:

A Float.

Arguments:

Considerations:

• ceil(null) returns null.

Query:

SELECT *
FROM cypher('graph_name', $$
    RETURN ceil(0.1)
$$) as (cil agtype);

The ceiling of 0.1 is returned.

Result:

floor

floor() returns the greatest floating point number that is less than or equal to the given number and equal to a mathematical integer.

Syntax: floor(expression)

Returns:

A Float.

Arguments:

Considerations:

• floor(null) returns null.

Query:

SELECT *
FROM cypher('graph_name', $$
    RETURN floor(0.1)
$$) as (flr agtype);

The floor of 0.1 is returned.

Result:

round

round() returns the value of the given number rounded to the nearest integer.

Syntax: round(expression)

Returns:

A Float.

Arguments:

`

Considerations:

• round(null) returns null.

Query:

SELECT *
FROM cypher('graph_name', $$
    RETURN round(3.141592)
$$) as (rounded_value agtype);

3.0 is returned.

Result:

sign

sign() returns the signum of the given number: 0 if the number is 0, -1 for any negative number, and 1 for any positive number

Syntax:sign(expression)

Returns:

An Integer.

Arguments:

Considerations:

• sign(null) returns null.

Query:

SELECT *
FROM cypher('graph_name', $$
    RETURN sign(-17), sign(0.1), sign(0)
$$) as (negative_sign agtype, positive_sign agtype, zero_sign agtype);

The signs of -17 and 0.1 are returned.

Result: