Can MySQL's FIND_IN_SET Function Leverage Indices?

Can MySQL FIND_IN_SET be Made to Exploit Indices?

In this question, we examine the behavior of MySQL's FIND_IN_SET function in comparison to the IN operator, which utilizes indices for faster data retrieval.

Understanding the Issue

As illustrated in the provided Explain results, FIND_IN_SET does not leverage the primary key index, leading to suboptimal performance. The goal is to find a way to achieve similar performance to the IN operator, which effectively utilizes indices.

Solution

While FIND_IN_SET cannot be directly optimized to use indices, a workaround exists by utilizing prepared statements.

Implementation

1. Create a prepared statement with a parameter to accept the comma-separated string.
2. Construct a dynamic query using the parameter string and the IN operator.

This approach achieves the desired behavior by using indices, similar to the IN operator, while allowing the query to be parameterized with a comma-separated string.

Additional Considerations

• Beware of SQL injection attacks when handling user-supplied data.
• Analyze table data after significant changes to optimize index performance.
• Understand the concept of a "Tablescan" and its implications for performance.

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