Master SQL from fundamentals to advanced — JOINs, aggregations, window functions, CTEs, indexes, query optimization, transactions, and PostgreSQL-specific features.
1-month free Pro trial included
SELECT, WHERE, ORDER BY, LIMIT, OFFSET — the building blocks of every SQL query
INNER JOIN, LEFT JOIN, RIGHT JOIN, FULL OUTER JOIN, CROSS JOIN, self-joins, and multi-table JOINs
COUNT, SUM, AVG, MIN, MAX, GROUP BY, HAVING, ROLLUP, and aggregate patterns
Subqueries (correlated and non-correlated), Common Table Expressions (WITH), and powerful window functions
B-tree indexes, composite indexes, EXPLAIN ANALYZE, query optimization, ACID transactions, and isolation levels
