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Returns the angle in radians whose tangent is the given float expression. Also referred to as arctangent.

ATAN ( float_expression )


An expression of the type float, or of types that can be implicitly converted to float.


The following example returns the arctangent of the tangent of various angles.

CREATE TABLE Atangent ("TAN(0)" float, "TAN(PI()/6)" float, "TAN(PI()/4)" float, "TAN(PI()/3)" float, "TAN(PI()/2)" float);

INSERT INTO Atangent VALUES (TAN(0), TAN(PI()/6), TAN(PI()/4), TAN(PI()/3), TAN(PI()/2));

SELECT ATAN("TAN(0)"), ATAN("TAN(PI()/6)"), ATAN("TAN(PI()/4)"), ATAN("TAN(PI()/3)"), ATAN("TAN(PI()/2)")FROM Atangent;
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