Returns the arc cosine of a number as an angle expressed in radians.

Syntax

---

ACOS(<NumericExpression>)

<NumericExpression> =

Type of:

SMALLINT
INTEGER|INT
BIGINT
FLOAT
DECIMAL|NUMERIC

Returns

---

FLOAT

Usage

---

The ACOS function returns the arc cosine of a number as an angle expressed in radians. Arc cosine is the inverse operation of cosine.

SQL 2003 Standard Deviations

---

This function deviates from the SQL 2003 standard in the following ways: