SQL Execution Visualizer — Interactive B+Tree & Query Engine

Write SQL queries and watch every step execute under the hood. This free, browser-based tool provides an interactive mini-database with animated B+Tree visualization, step-by-step execution plans, and live schema browsing.

Features

Interactive SQL query execution with instant feedback
Animated B+Tree index visualization showing inserts, splits, and deletions
Step-by-step execution plan walkthrough — see exactly how your query runs
Live schema browser with table and column inspection
Full in-browser database engine — no server required
Dark and light theme support

How It Works

Type any SQL statement — CREATE TABLE, INSERT, SELECT, UPDATE, or DELETE — into the editor. The visualizer breaks the query into discrete execution steps, animates the underlying B+Tree data structure changes, and displays results in real time.

Who Is This For?

Students learning database internals, developers debugging query performance, educators teaching B+Tree indexing, or anyone curious about what happens when a database processes SQL.

SQL Visualizer

B+Tree Engine · v2

📂Schema0

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No Tables

CREATE TABLE to get started

⏳ 0 tables · 0 indexes

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Query Execution Pipeline

Run a SELECT query to see the execution order flow.
FROM → JOIN → WHERE → GROUP BY → HAVING → SELECT → ORDER BY → LIMIT

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Speed:

📋Execution Plan

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No Execution Plan

Run a query to see the execution steps

SQL Editor · ⌘↵ to run · Tab for autocompleteChoose an Example

📊Query Results

No results yet. Run a query.