SQL Server COT() Function

Summary: in this tutorial, you will learn how to use the SQL Server COT() function to calculate the cotangent of a number.

Introduction to the SQL Server COT() function

In SQL Server, the COT() function is a math function that returns the cotangent of a number.

Here’s the syntax of the COT() function:

COT(n)Code language: SQL (Structured Query Language) (sql)

In this syntax:

• n is the angle in radians for which you want to find the cotangent value.

The COT() function returns the cotangent of the argument n. If n is NULL, the COT() function returns NULL.

SQL Server COT() function examples

Let’s take some examples of using the COT() function.

1) Basic COT() function example

The following example uses the COT() function to calculate the cotangent of 1 radian:

SELECT COT(1) cotangent_value;Code language: SQL (Structured Query Language) (sql)

Output:

cotangent_value
------------------
0.6420926159343306
Code language: SQL (Structured Query Language) (sql)

2) Using the COT() function with PI() function

The following example uses the COT() function to find the cotangent of pi/4:

SELECT COT(PI()/4) cotangent_value;Code language: SQL (Structured Query Language) (sql)

Output:

cotangent_value
---------------
1.0Code language: SQL (Structured Query Language) (sql)

3) Using COT() function with table data

First, create a table called angles to store angles in radians:

CREATE TABLE angles(
    id INT IDENTITY PRIMARY KEY,
    angle DEC(19,2)
);Code language: SQL (Structured Query Language) (sql)

Second, insert some rows into the angles table:

INSERT INTO
  angles (angle)
VALUES
  (NULL),
  (PI() / 4),
  (PI() / 2);Code language: SQL (Structured Query Language) (sql)

Third, retrieve data from the angles table:

SELECT
  id,
  angle
FROM
  angles;Code language: SQL (Structured Query Language) (sql)

Output:

id | angle
---+------
1  | NULL
2  | 0.79
3  | 1.57
(3 rows)Code language: SQL (Structured Query Language) (sql)

Finally, calculate the cotangents of angles from the angles table:

SELECT
  id,
  angle,
  ROUND(COT(angle),0) tangent_value
FROM
  angles;Code language: SQL (Structured Query Language) (sql)

Output:

id | angle | tangent_value
---+-------+--------------
1  | NULL  | NULL
2  | 0.79  | 1.0
3  | 1.57  | 0.0
(3 rows)Code language: SQL (Structured Query Language) (sql)

Summary

• Use the COT() function to calculate the cotangent of a number.