Sql, Sql Optimization, Database Optimization, Data Processing, Data Management.
separately. It’s much quicker and more organized. SELECT * FROM table1 WHERE id IN (SELECT id FROM table2); -- Replace with: SELECT * FROM table1 WHERE EXISTS (SELECT 1 FROM table2 WHERE table1.id = table2.id); Use Aggregate Functions Wisely: Minimize the use of aggregate functions (SUM, AVG,