SQL Server SQUARE() Function

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

Introduction to the SQL Server SQUARE() function

The SQUARE() function is a mathematical function that allows you to calculate the square of a number.

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

SQRT(number)Code language: SQL (Structured Query Language) (sql)

In this syntax:

The number is a float or any number that can be implicitly converted to a float.

The SQUARE() function returns the square of the number with the type of float. If the number is NULL, the SQUARE() function returns NULL.

SQL Server SQUARE() function examples

Let’s explore some examples of using the SQUARE() function.

1) Basic SQUARE() function example

The following statement uses the SQUARE() function to return the square of 5:

SELECT SQUARE(5) AS result;Code language: SQL (Structured Query Language) (sql)

Result:

result
------
25Code language: SQL (Structured Query Language) (sql)

The query returns 25 as the square of 5.

2) Using the SQUARE() function to calculate areas of squares

First, create a table called squares to store the length of squares:

CREATE TABLE squares(
    id INT IDENTITY PRIMARY KEY,
    length DEC(10,2)
);Code language: SQL (Structured Query Language) (sql)

Second, insert some rows into the squares table:

INSERT INTO squares (length) 
VALUES
    (2.5),
    (3),
    (5),
    (6),
    (9);Code language: SQL (Structured Query Language) (sql)

Third, retrieve data from the squares table:

SELECT
  id,
  length
FROM
  squares;Code language: SQL (Structured Query Language) (sql)

Output:

id | length
---+---------
1  | 2.50
2  | 3.00
3  | 5.00
4  | 6.00
5  | 9.00
(5 rows)Code language: plaintext (plaintext)

Finally, calculate the areas of the squares using the SQUARE() function:

SELECT
  id,
  length,
  SQUARE(length) area
FROM
  squares;Code language: SQL (Structured Query Language) (sql)

Output:

id | length | area
---+--------+-------
1  | 2.50   | 6.25
2  | 3.00   | 9.0
3  | 5.00   | 25.0
4  | 6.00   | 36.0
5  | 9.00   | 81.0
(5 rows)Code language: plaintext (plaintext)

Summary

Use the SQL Server SQUARE() function to calculate the square of a number.

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