Simon Willison 7/18/2026

SQLite Query Explainer

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This article presents a browser-based tool that runs SQLite queries using Pyodide (Python in WebAssembly) and provides detailed annotations for both EXPLAIN QUERY PLAN and low-level EXPLAIN bytecode output. The tool translates technical query execution details into plain-English explanations, helping developers understand how SQLite's query planner and virtual machine work. Built with inspiration from Julia Evans, it offers an interactive way to learn SQLite internals without needing deep expertise. The author notes the explanations may not be fully verified but appear reasonable.

SQLite Query Explainer

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