RADIANS

Converts a numeric expression from degree values to radian values.

See also DEGREES.

Syntax

RADIANS( expr )

Arguments

Parameter

Description

expr

Numeric expression

Returns

When using the RADIANS floating point number scalar function, real arguments are automatically cast to double precision.

Notes

  • If the value is NULL, the result is NULL.

Examples

For these examples, consider the following table and contents:

CREATE TABLE trig(f DOUBLE);

INSERT INTO trig VALUES (0), (15), (22.5)
   , (30), (45), (60), (67.5), (75), (90);

 -- Equivalent to these values in radians:
 --  (0), (PI()/12), (PI()/8), (PI()/6)
 -- ,(PI()/4), (PI()/3), (3*PI()/8), (5*PI()/12), (PI()/2);

numbers=> SELECT f, RADIANS(f) FROM trig;
f    | radians
-----+--------
   0 |       0
  15 |  0.2618
22.5 |  0.3927
  30 |  0.5236
  45 |  0.7854
  60 |  1.0472
67.5 |  1.1781
  75 |   1.309
  90 |  1.5708