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Updated on 2023-10-25 GMT+08:00
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atan

This function is used to return the arc tangent value of a given angle a.

Syntax

atan(DOUBLE a)

Parameters

Table 1 Parameter

Parameter

Mandatory

Type

Description

a

Yes

DOUBLE, BIGINT, DECIMAL, or STRING

The value can be a float, integer, or string.

If the value is not of the DOUBLE type, the system will implicitly convert it to the DOUBLE type for calculation.

Return Values

The return value is of the DOUBLE type. The value ranges from -π/2 to π/2.

  • If the value of a is not within the range [-1,1], NaN is returned.
  • If the value of a is NULL, NULL is returned.

Example Code

The value 0.7853981633974483 is returned.

select atan(1);

The value 0.5404195002705842 is returned.

select atan(0.6);

The value NULL is returned.

select atan(null);
Parent topic: Mathematical Functions