How Can I Check if Specific Numbers Exist in a Comma-Separated List in MySQL?

Identifying Numbers in a Comma-Separated MySQL List

In database management, it is often necessary to check if specific numbers exist within a comma-separated list stored as a BLOB data type. Consider a table with the following schema:

UID (int) | NUMBERS (blob)

Suppose you want to determine if the numbers 3 and 15 are present in the NUMBERS column for a given row. Since the LIKE operator cannot be used effectively with comma-separated lists, an alternative approach is required.

One efficient solution is to use the IN operator:

SELECT * FROM table WHERE 3 IN (NUMBERS) AND 15 IN (NUMBERS)

The IN operator checks if a value is contained within a comma-separated list. In the example above, it verifies whether the numbers 3 and 15 are present within the NUMBERS column for each row. Consequently, only the row with UID 2 will be selected, as it contains both 3 and 15.

This method is straightforward and can be easily adapted to test for multiple numbers simultaneously. It is supported by MySQL and other commonly used relational database management systems. By leveraging this IN operator, you can efficiently identify the presence of specific numbers within a comma-separated list stored in a MySQL database.

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