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How to Optimize MySQL Queries for Better Performance

Tutorial August 12, 2024
mysql

Subqueries can be inefficient as they may require multiple scans of the same table. Use joins or derived tables instead.

-- Subquery
SELECT * FROM users WHERE user_id IN (SELECT user_id FROM orders);

-- Optimized with JOIN
SELECT users.* FROM users
JOIN orders ON users.user_id = orders.user_id;

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