SQL Optimization
Efficient queries reduce load and improve response times.
Use EXPLAIN
EXPLAIN ANALYZE
SELECT * FROM users WHERE email = 'test@example.com';Indexing
-- Create index
CREATE INDEX idx_users_email ON users(email);
-- Composite index
CREATE INDEX idx_orders_user_date ON orders(user_id, created_at);Best Practices
- Select only needed columns
- Use WHERE to filter early
- Avoid SELECT *
- Use JOINs instead of subqueries
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