SQL Fundamentals

Beginner

SQL is the language of data. Master filtering, joins, aggregations, and window functions — the skills that make you dangerous with any database.

0/5

Foundations

Write a JOIN QueryINNER JOIN

Easy10m

Aggregation & GROUP BYSUM + HAVING

Medium15m

Subqueries vs CTEsMCQ — WITH clause

Medium10m

Window Functions for RankingROW_NUMBER + PARTITION BY

Hard20m