PostgreSQL ASIN() Function

The PostgreSQL ASIN() function returns arc sine of a value. The returned value will be in the range -𝜋/2 through 𝜋/2. The other variant of this function is ASIND() which returns the result in degrees.

If the argument is not within the range of -1 to 1, then this function returns an error.

Note: ASIN() is the inverse of SIN().

Syntax

/* returns result in radians */
ASIN(x)

/* returns result in degrees */
ASIND(x)

Parameters

Return Value

Returns the arc sine of the value.

Example 1:

The example below shows the usage of ASIN() function.

SELECT ASIN(0.2);
Result: 0.2013579207903308

SELECT ASIN(0.8);
Result: 0.9272952180016123

SELECT ASIN(1);
Result: 1.5707963267948966

SELECT ASIN(-1);
Result: -1.5707963267948966

SELECT ASIN(0);
Result: 0

SELECT ASIN(-0.2);
Result: -0.2013579207903308

SELECT ASIND(-0.2);
Result: -11.536959032815487

SELECT ASIND(-1);
Result: -90

Example 2:

Consider a database table called Sample with the following records:

The statement given below can be used to calculate the arc sine of records of column x.

SELECT *, ASIN(x) AS ASIN_Value FROM Sample;

This will produce the result as shown below: