ASIN

Returns the inverse sine value of a numeric expression

Syntax

ASIN( expr )

Arguments

Parameter	Description
`expr`	Numeric expression in range `[-1.0, 1.0]`

Returns

Always returns a floating point result of the inverse sine, in radians.

Notes

Valid inputs for an inverse sine are in the range [ -1.0 , 1.0]. Inputs exceeding this range will result in an error.
The result is given in radians, in the range [-π/2, π/2].
If the input value is NULL, the result is NULL.

Examples

For these examples, consider the following table and contents:

CREATE TABLE trig(i INT, f DOUBLE);

INSERT INTO trig VALUES (0,0.0), (1,-0.866)
, (2,-0.707), (3,-0.5)
, (4,0.5), (5,0.707)
, (6, 0.866), (7, 1);

Inverse sine of 1 (= π/2)

numbers=> SELECT ASIN(1);
asin
-------------------
1.5707963267948966

Computing inverse sine for a column

numbers=> SELECT f, ASIN(f) FROM trig;
f     | asin
------+------
    0 |     0
-0.87 | -1.05
-0.71 | -0.79
 -0.5 | -0.52
  0.5 |  0.52
 0.71 |  0.79
 0.87 |  1.05
    1 |  1.57