How Can I Add or Remove Leading Zeros from Numbers in SQL Server?

SQL Server Number Formatting: Adding and Removing Leading Zeros

This guide demonstrates how to add or remove leading zeros from numeric values within SQL Server queries. This is useful for display purposes or maintaining data consistency.

Adding Leading Zeros:

To prepend leading zeros, leverage the REPLICATE function, which repeats a string a given number of times. For instance:

<code class="language-sql">SELECT REPLICATE('0', 6 - LEN(EmployeeID)) + EmployeeID AS FormattedEmployeeID</code>

Here, 6 specifies the total desired length (including leading zeros). Adjust this value as needed.

If EmployeeID is an INT, use RTRIM for implicit conversion to VARCHAR before adding zeros:

<code class="language-sql">SELECT REPLICATE('0', 6 - LEN(RTRIM(EmployeeID))) + RTRIM(EmployeeID) AS FormattedEmployeeID</code>

Removing Leading Zeros:

To retrieve the original numeric value without leading zeros, employ the RIGHT and PATINDEX functions:

<code class="language-sql">SELECT RIGHT(EmployeeID, (LEN(EmployeeID) - PATINDEX('%[^0]%', EmployeeID)) + 1) AS OriginalEmployeeID</code>

This efficiently extracts the portion of the string after the leading zeros.

These techniques provide straightforward methods for managing leading zeros in your SQL Server data, enhancing both data presentation and manipulation.

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