Have you worked with query plans? Have you used EXPLAIN ANALYZE?

Yes, working with the query plan and using EXPLAIN ANALYZE are important tools for analyzing SQL query performance.

EXPLAIN ANALYZE executes the query and shows a detailed execution plan with actual time and number of rows processed at each step.

This helps to:

• Understand which operations take the most time.
• Identify bottlenecks, such as full table scans instead of using indexes.
• Optimize queries and database structure.

Example of usage in PostgreSQL:

EXPLAIN ANALYZE SELECT * FROM orders WHERE customer_id = 123;

The result will show the sequence of operations, time, and number of rows, allowing conclusions about the query's efficiency.