i tried to solve as many tasks as possible to make my SQL skills better
One SQL problem a day for a year
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.
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