Round Function in SQL Server: Understanding and Implementing

Greetings Dev, are you looking for a way to round values in SQL Server? Look no further. In this journal article, we will cover the basics of the ROUND function in SQL Server, including its syntax, parameters, and examples. By the end of this article, you will have a clear understanding of how to round values in SQL Server, and be able to implement this function in your own queries.

Syntax and Parameters

The ROUND function in SQL Server allows you to round a numeric value to a specified length or precision. The basic syntax of the ROUND function is as follows:

Parameter	Description
expression	The numeric expression to be rounded.
length	The length or precision to which the expression should be rounded.

The length parameter is optional. If it is not specified, the ROUND function will round the expression to 0 decimal places.

Examples

To better understand the ROUND function in SQL Server, let’s take a look at some examples:

Rounding to 1 Decimal Place

To round a value to 1 decimal place, we can use the following syntax:

SELECT ROUND(123.456, 1);

The output of this query will be:

Result
123.5

Rounding to 2 Decimal Places

To round a value to 2 decimal places, we can use the following syntax:

SELECT ROUND(123.456, 2);

The output of this query will be:

Result
123.46

Rounding to 0 Decimal Places

To round a value to 0 decimal places, we can use the following syntax:

SELECT ROUND(123.456);

The output of this query will be:

Result
123

FAQ

What is the difference between ROUND and CEILING?

The ROUND function rounds a numeric value to a specified length or precision, while the CEILING function rounds a numeric value to the nearest integer greater than or equal to the value. For example, if we apply the ROUND function to the value 1.5 with a length of 0, the result will be 2. If we apply the CEILING function to the same value, the result will also be 2.

Can I round negative values?

Yes, you can round negative values using the ROUND function in SQL Server. The function will round the absolute value of the expression, and then apply the sign of the expression to the result. For example, if we apply the ROUND function to the value -1.5 with a length of 0, the result will be -2.

Can I round to a negative precision?

No, you cannot round to a negative precision using the ROUND function in SQL Server. If you attempt to do so, you will receive an error message.

Can I use the ROUND function with non-numeric values?

No, the ROUND function can only be used with numeric values in SQL Server. If you attempt to use the function with a non-numeric value, you will receive an error message.

Conclusion

Now that you have a clear understanding of the ROUND function in SQL Server, you can implement this function in your own queries with confidence. Remember, the ROUND function allows you to round a numeric value to a specified length or precision, and can be used to round both positive and negative values. Use this function to simplify your queries and improve the accuracy of your results.