Designing a composite index for a query with a mix of WHERE conditions and ORDER BY clauses

When designing a composite index for a query with a mix of WHERE conditions and ORDER BY clauses, you need to carefully arrange the columns in the index. The order of columns in the index should maximize its usefulness for filtering (WHERE) and sorting (ORDER BY) while adhering to MySQL's index usage rules.

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General Strategy

1. Start with Columns in the WHERE Clause:

   • Include the columns in the WHERE condition first, in the order they appear in the query. Prioritize equality conditions (=) before range conditions (<, >, BETWEEN).

2. Follow with Columns in the ORDER BY Clause:

   • After the WHERE columns, include the columns used in the ORDER BY clause.

3. Colum