ACOS function - Amazon Redshift
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ACOS function

ACOS is a trigonometric function that returns the arc cosine of a number. The return value is in radians and is between 0 and PI.

Syntax

ACOS(number)

Arguments

number

The input parameter is a DOUBLE PRECISION number.

Return type

DOUBLE PRECISION

Examples

To return the arc cosine of -1, use the following example.

SELECT ACOS(-1); +-------------------+ | acos | +-------------------+ | 3.141592653589793 | +-------------------+

To convert the arc cosine of .5 to the equivalent number of degrees, use the following example.

SELECT (ACOS(.5) * 180/(SELECT PI())) AS degrees; +-------------------+ | degrees | +-------------------+ | 60.00000000000001 | +-------------------+