ASIN

​

Syntax

​

Scalar

asin(value)

​

Arguments

​

Returns

• Type: DOUBLE; FLOAT when the input is evaluated as FLOAT
• Possible values: Values in radians from -pi/2 through pi/2 for input in [-1, 1]; NaN outside this domain.
• NULL behavior: Returns NULL when an argument is NULL.

​

Properties

• Approximation bound: No fixed maximum error is guaranteed.

​

Units

• Input unit: Dimensionless number
• Output unit: Radians
• Use degrees(result) to convert the result to degrees.

​

Usage notes

• Numeric inputs are normally converted to DOUBLE for calculation. An input evaluated as FLOAT keeps FLOAT precision.
• INTEGER and INT mean the same type; STRING means VARCHAR text. NULL can be used with a supported type. Cast NULL explicitly when its type would otherwise be unclear.
• Exact result: Floating-point computation can round the mathematical result.

​

Examples

​

Value and NULL input

SELECT asin(CAST(0 AS DOUBLE)) AS "value", asin(CAST(NULL AS DOUBLE)) AS null_value;

​

The two input boundaries

SELECT round(asin(CAST(-1 AS DOUBLE)), 6) AS at_minus_one, round(asin(CAST(1 AS DOUBLE)), 6) AS at_one;

​

Limitations

• Input outside [-1, 1] produces NaN rather than NULL.
• Query tools may report DOUBLE even when the result is FLOAT. The reported type does not increase the result’s precision.

​

Related functions

• radians
• degrees