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In general, using INNER JOIN with GROUP BY is more efficient than using subquery with GROUP BY in MySQL 8. This is because MySQL is able to optimize INNER JOIN operations with indexes, which can significantly improve query performance.
When using subquery with GROUP BY, MySQL has to execute the subquery first and then perform the GROUP BY operation on the result set. This can be slower than using INNER JOIN with GROUP BY because it requires additional processing steps.
Furthermore, using subquery with GROUP BY can also result in more complex and harder to read SQL queries, which can lead to maintenance issues in the long run.
Overall, using INNER JOIN with GROUP BY is a better approach for optimizing query performance in MySQL 8.