How Can I Control Decimal Places in SQL Server Using CONVERT?

Precision and Scale in SQL Server Numerical Data

Maintaining accurate decimal places is vital when dealing with numerical data in SQL Server, especially for financial applications. SQL Server's CONVERT function offers a powerful way to manage this precision.

Leveraging the CONVERT Function for Decimal Control

The CONVERT function allows you to change a value's data type, including specifying the desired precision and scale (number of decimal places).

Syntax and Parameters

The structure for using CONVERT to control decimal places is as follows:

<code class="language-sql">SELECT CONVERT(DECIMAL(precision, scale), your_number)</code>

Here's a breakdown of the parameters:

• precision: The total number of digits (both before and after the decimal point).
• scale: The number of digits after the decimal point.
• your_number: The numerical value you want to format.

Illustrative Example

Let's say you need to display a number with two decimal places:

<code class="language-sql">SELECT CONVERT(DECIMAL(10, 2), 2.999999);</code>

The output will be 3.00. The CONVERT function truncates any extra digits beyond the specified scale.

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