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

Syntax

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ATAN(<NumericExpression>)

<NumericExpression> =

Type of:

SMALLINT
INTEGER|INT
BIGINT
FLOAT
DECIMAL|NUMERIC

Returns

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FLOAT

Usage

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The ATAN function returns the arc tangent of a number as an angle expressed in radians.

SQL 2003 Standard Deviations

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