Understanding SQL Server Round Function

Hello Dev, welcome to this journal article that will take you through the nitty-gritty of SQL Server Round Function. As you know, SQL Server is a Relational Database Management System that provides tools for creating, querying, and managing databases. The ROUND function, in particular, is an essential tool that you will need when working with numerical data in SQL Server.

What is SQL Server Round Function?

The ROUND function in SQL Server allows you to round a numeric value to a specified length or precision. The function rounds the input number to the nearest value, based on the specified decimal places. For example, if you want to round a value to two decimal places, the function will round the value to the nearest hundredth.

The basic syntax of the ROUND function is:

How to Use SQL Server Round Function

To use the ROUND function in SQL Server, you must provide the numeric value you want to round and the number of decimal places to which you want to round it.

Syntax

The basic syntax of the ROUND function in SQL Server is as follows:

SELECT ROUND(numeric_expression, length[ ,function ])

Parameters

The ROUND function takes the following parameters:

Examples

Here are some examples of how to use the ROUND function in SQL Server:

Example 1: Round to the nearest whole number

If you want to round a number to the nearest whole number, you can use the following query:

SELECT ROUND(123.4567, 0)

The output of this query will be:

123

Example 2: Round to two decimal places

If you want to round a number to two decimal places, you can use the following query:

SELECT ROUND(123.4567, 2)

The output of this query will be:

123.4600

Frequently Asked Questions

What is the difference between ROUND and CEILING functions in SQL Server?

The ROUND function rounds a value to a specified number of decimal places, while the CEILING function rounds a value up to the nearest integer or multiple of a specified number.

What is the difference between ROUND and FLOOR functions in SQL Server?

The ROUND function rounds a value to a specified number of decimal places, while the FLOOR function rounds a value down to the nearest integer or multiple of a specified number.

Can the ROUND function round negative numbers?

Yes, the ROUND function can round negative numbers. For example, if you want to round -123.4567 to two decimal places, you can use the following query:

SELECT ROUND(-123.4567, 2)

The output of this query will be:

-123.4600

Can the ROUND function be used with other SQL Server functions?

Yes, the ROUND function can be used with other SQL Server functions, such as SUM and AVG. For example, if you want to round the average salary of employees to two decimal places, you can use the following query:

SELECT ROUND(AVG(salary), 2) FROM employees

The output of this query will be:

4500.00

Conclusion

In conclusion, SQL Server ROUND function is an essential tool that you need when working with numerical data in SQL Server. This function allows you to round a numeric value to a specified length or precision. By understanding how to use this function, you will be able to manipulate numerical data in a more precise manner, ensuring that your database is optimized for the best performance.