SQL Visualizer is a free, in-browser tool that animates how a SQL query runs step by step — FROM → JOIN → WHERE → GROUP BY → HAVING → SELECT → ORDER BY → LIMIT — using DuckDB compiled to WebAssembly. Write a query and watch each clause filter, join, group, and order the rows. No signup, no install, and your data never leaves your browser.
This interactive visualizer requires JavaScript to run the in-browser query engine. It supports JOINs, GROUP BY, HAVING, window functions, CTEs (including recursive), set operations (UNION / EXCEPT / INTERSECT), LATERAL joins, and scalar subqueries.