ATAN¶

Computes the inverse tangent (arc tangent) of its argument; the result is a number in the interval [-pi, pi].

Syntax¶

ATAN( <input_expr> )

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input_expr: The value or expression to operate on. The data type must be FLOAT or DECFLOAT.

If the input expression is of type DECFLOAT, the returned type is DECFLOAT. Otherwise, the returned type is FLOAT.

Returns the arc tangent in radians (not degrees) in the range [-pi, pi].

SELECT ATAN(1);

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   ATAN(1)    |
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 0.7853981634 |
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