<ul><li>Common causes of slow queries include poorly written SQL statements, inefficient indexing, lack of database normalization, and insufficient server resources.</li><li>Analyzing query execution plans can help identify bottlenecks for effective optimization.</li><li>Optimization techniques include choosing the right indexes, optimizing table structures, and writing efficient SQL code.</li><li>MySQL and PostgreSQL have different indexing and query optimization features. Understanding these differences is important for effective optimization.</li></ul>

SQL Query Optimization: Tips & Tricks for MySQL, PostgreSQL & More

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