Free SQL practice

Practice SQL.
In your browser. For free.

A free site for practicing SQL. Pick a problem, write a query against real tables, and check it against the expected result — no setup, no paywall.

Today

292. Median Salary by Department using PERCENTILE_CONT

One problem a day. Same for everyone (UTC).

Continue

Joins, window functions, and more — in a sensible order.

Easy to hard questions covering joins, CTEs, window functions, and aggregations.

Run your query and see if it matches. Hints are there when you get stuck.

Solve a few problems a day, keep a freeze for missed days, and climb the leaderboard.

select-all-employees.sql

-- pick a problem and start writing
SELECT *
FROM employees;