How RADIANS() Works in MariaDB

In MariaDB, RADIANS() is a built-in function that returns its argument converted from degrees to radians.

The RADIANS() function is the converse of the DEGREES() function.

Syntax

The syntax goes like this:

RADIANS(X)

Where X is the value, in degrees, that is to be converted to radians.

Example

Here’s an example:

SELECT RADIANS(30);

Result:

+--------------------+
| RADIANS(30)        |
+--------------------+
| 0.5235987755982988 |
+--------------------+

Fractions

The argument can contain a fractional part:

SELECT RADIANS(125.34178);

Result:

+--------------------+
| RADIANS(125.34178) |
+--------------------+
|  2.187626751310378 |
+--------------------+

Negative Values

The argument can be negative:

SELECT RADIANS(-240);

Result:

+---------------------+
| RADIANS(-240)       |
+---------------------+
| -4.1887902047863905 |
+---------------------+

Expressions

The argument can include expressions like this:

SELECT RADIANS(80 * 12);

Result:

+--------------------+
| RADIANS(80 * 12)   |
+--------------------+
| 16.755160819145562 |
+--------------------+

Non-Numeric Arguments

Here’s an example of what happens when we provide a non-numeric argument:

SELECT RADIANS('Cat');

Result:

+----------------+
| RADIANS('Cat') |
+----------------+
|              0 |
+----------------+
1 row in set, 1 warning (0.001 sec)

Let’s see the warning:

SHOW WARNINGS;

Result:

+---------+------+-----------------------------------------+
| Level   | Code | Message                                 |
+---------+------+-----------------------------------------+
| Warning | 1292 | Truncated incorrect DOUBLE value: 'Cat' |
+---------+------+-----------------------------------------+

Null Arguments

RADIANS() returns null if the argument is null:

SELECT RADIANS(null);

Result:

+---------------+
| RADIANS(null) |
+---------------+
|          NULL |
+---------------+

Missing Arguments

Calling RADIANS() with the wrong number of arguments, or without any arguments results in an error:

SELECT RADIANS();

Result:

ERROR 1582 (42000): Incorrect parameter count in the call to native function 'RADIANS'

And:

SELECT RADIANS(10, 2);

Result:

ERROR 1582 (42000): Incorrect parameter count in the call to native function 'RADIANS'