sql-practice

i tried to solve as many tasks as possible to make my SQL skills better

Sql practice from cs50 course

One SQL problem a day for a year

Free, open-source fintech data engineering roadmap: 100 English lessons, 40 exercises and 8 scenario labs. Python + SQL practice with synthetic payments, reconciliation, CDC and recovery. No paid cloud required for core labs.

Hospital database and 33 SQL practice queries (joins, subqueries, window functions, CTEs) with tests. Runs on SQLite, MySQL notes included.

A LeetCode-inspired MySQL practice app featuring 30 World Dataset assignment questions, a dark editor, custom testcases, and automated answer validation.

Learn SQL by solving a corporate fraud mystery. Free game — write real queries, uncover evidence, catch a thief

40 runnable SQL analytics challenges covering cohorts, retention, windows, revenue, and data engineering patterns.

LeetCode practice repository focused on SQL, Python, and Data Structures & Algorithms for technical and Data Analyst interview preparation.

Beginner-friendly SQLite practice: 26 commented queries, fictional sample data, joins, aggregates, subqueries, transactions, exercises, and verified expected results.