RADIANS() is a function in SQL that is very useful for the conversion, which converts the degree to the radians and returns the radians value.

Suppose we have a database table that stores the angles in a column. If we want to convert all angles’ degrees to radians, then we can pass the name of the table's column to the RADIANS() function.

### Syntax

Following is the syntax of the SQL Radians() function −

```SELECT RADIANS(numeric expression) AS Alias_name;
```

The numeric expression is the angle specified in radians. Except for bit data types, it can be the expression of the exact numeric or approximate numeric data types.

Following is the syntax of the RADIANS() function that is used in the SQL and fetches the data from the created table.

```SELECT RADIANS(column_name) AS Alias_Name FROM table_name;
```

In the above syntax, we are using the table name that we have created, and we have to define the name of the column on which we want to perform the RADIANS() function.

### Example

In the following example, we are finding the radians values of the given degree value of the exact numeric value using the RADIANS() function in SQL.

Following is the query −

```SELECT RADIANS(90) AS Radians_value;
```

### Output

When the above SQL query is executed, it gives the 1 radians value of the 90 degree because 90 is the exact numeric data type.

```+--------------------+
+--------------------+
|                 1  |
+--------------------+
```

### Example

In the following example, we are finding the radians value of the given fractional degree.

Following is the query −

```SELECT RADIANS(180.0) AS radians_of_180;
```

### Output

When the above SQL query is executed, it gives the fractional radians value of the 180.0 degree because 180.0 is an approximate numeric data type.

```+---------------------+
+---------------------+
|3.141592653589793116 |
+---------------------+
```

### Example

In the following example we are calculating the radians value of PI using the RADIANS() function in SQL.

Following is the query −

```SELECT RADIANS(pi()) AS radians_of_180;
```

### Output

Following is the output of the above SQL query −

```+---------------------+
+---------------------+
| 0.05483113556160755 |
+---------------------+
```

### Example

In the following example we are fetching the ID and calculating the radians value of the ID from the customers table.

Let’s create a table named customers using the CREATE statement −

```CREATE TABLE customers(ID INT NOT NULL PRIMARY KEY(ID),
NAME VARCHAR(30) NOT NULL,
AGE INT NOT NULL,
SALARY DECIMAL(18, 2));
```

Let’s insert the data into the customers using the INSERT statement −

```insert INTO customers VALUES(1, 'Ramesh', 32, 'Ahmedabad', 2000);
insert INTO customers VALUES(2, 'Aman' 23, 'Ranchi', 40000);
insert INTO customers VALUES(3, 'kaushik', 23, 'Kota', 2000);
insert INTO customers VALUES(4, 'Chaitali', 25, 'Mumbai', 6500);
insert INTO customers VALUES(5, 'Rakesh', 24, 'Kota', 30000);
insert INTO customers VALUES(6, 'Vivek', 22, 'Ranchi', 35000);
insert INTO customers VALUES(7, 'Akash', 22, 'Ranchi', 50000);
```

Let’s display the customers details using the SELECT statement −

```SELECT * FROM customers;
```

Following is the customers table −

```+------+----------+------+-----------+--------+
| ID   | NAME     | AGE  | ADDRESS   | SALARY |
+------+----------+------+-----------+--------+
|    1 | Ramesh   |   32 | Ahmedabad |   2000 |
|    2 | Aman     |   23 | Ranchi    |  40000 |
|    3 | kaushik  |   23 | Kota      |   2000 |
|    4 | Chaitali |   25 | Mumbai    |   6500 |
|    5 | Rakesh   |   24 | kota      |  30000 |
|    6 | Vivek    |   22 | Ranchi    |  35000 |
|    7 | Akash    |   22 | Ranchi    |  50000 |
+------+----------+------+-----------+--------+
```

Following is the query to fetch the ID and converting them into the radians and displaying the radians value of ID −

```SELECT
FROM customers;
```

### Output

When we execute the above SQL query, we get the ID and its radians value. In SQL, the radians of each ID are 0 because IDs are not approximate numeric data types.

```+----+---------------+
+----+---------------+
|  1 |             0 |
|  2 |             0 |
|  3 |             0 |
|  4 |             0 |
|  5 |             0 |
|  6 |             0 |
|  7 |             0 |
+----+---------------+
```
sql-numeric-functions.htm 