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How Can I Check if a MySQL Column Value is a Number?

DDDOriginal: 2025-01-13 15:32:42203browse

Verifying Numerical Data in MySQL Queries

This guide demonstrates how to identify numeric column values within your MySQL database. We'll explore two effective techniques.

The first method employs the ISNUMERIC() function (if available in your MySQL version):

<code class="language-sql">SELECT *
FROM myTable
WHERE ISNUMERIC(col1) = 1;</code>

Note: The ISNUMERIC() function's availability may depend on your specific MySQL setup and version.

A more robust and widely compatible approach involves regular expressions:

<code class="language-sql">SELECT *
FROM myTable
WHERE col1 REGEXP '^[0-9]+$';</code>

This regular expression efficiently confirms that the col1 value contains only digits (0-9). For a deeper understanding of MySQL regular expressions, consult the official MySQL documentation: https://www.php.cn/link/81a0c4689fb7ce553a0d5c2fd19b6efd

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