SQL Visualizer — Step-by-Step Query Execution

Write SQL queries and visualize each execution phase step-by-step: FROM, JOINs, WHERE, GROUP BY, HAVING, SELECT, ORDER BY, and LIMIT.

How it Works

DevVizor parses your SQL query and executes it against standard educational datasets (e.g. Employees, E-Commerce, University). It records the intermediate table state at every stage of the SQL execution order, showing you exactly how rows are filtered, grouped, aggregated, and sorted.

Supported SQL Clauses

FROM & JOIN: Combines inputs and builds the initial dataset.
WHERE: Filters rows before any grouping occurs.
GROUP BY: Groups rows by specified columns.
HAVING: Filters grouped buckets using aggregate functions.
SELECT & WINDOW: Computes output columns, window functions, and distinct values.
ORDER BY: Sorts the final dataset.
LIMIT & OFFSET: Restricts the number of returned rows.
DML & DDL Support: Support for INSERT, UPDATE, DELETE, CREATE, and ALTER query visualizations.