How Can I Truncate, Not Round, Decimal Places in SQL Server?

Removing Decimal Places in SQL Server: A Truncation Approach

SQL Server often requires manipulating decimal data, sometimes necessitating the removal of trailing decimal places without altering the value through rounding. Unlike the ROUND function's rounding behavior, scenarios demand pure truncation for data integrity.

Consider this example:

<code class="language-sql">DECLARE @value DECIMAL(18,2);
SET @value = 123.456;</code>

SQL Server inherently rounds @value to 123.46. To truncate instead, leverage the ROUND function with a specific third parameter:

<code class="language-sql">ROUND(123.456, 2, 1);</code>

The crucial third parameter (1) directs truncation, not rounding. The result is 123.45, effectively removing the extra decimal digit.

Function Syntax

The ROUND function's syntax for truncation is:

<code class="language-sql">ROUND(numeric_expression, length, function)</code>

Parameters:

• numeric_expression: The decimal value to truncate.
• length: The desired number of decimal places to keep.
• function: The operation type (0 for rounding, any non-zero value for truncation).

Employing ROUND with the truncation parameter provides a precise method for removing decimal places in SQL Server without the inaccuracies introduced by rounding, ensuring data accuracy in applications.

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