Your SQL and progress stay in this browser.
Practice the skill,
with original questions.
Every challenge in this lab is original. The coverage is grounded in public SQL learning material and implemented against real PostgreSQL behavior.
No copied paywalled or proprietary interview banks.
Open practice for operational PostgreSQL fluency.
Curriculum reference
02PostgreSQL Exercises
A CC BY-SA progression from basic SELECTs through joins, aggregation, windows, and recursive queries. SQL Lab uses a newly authored operational dataset and prompts.
Runtime
03PGlite documentation
The PostgreSQL WebAssembly build that executes every query locally in this browser without a server.
Primary reference
PostgreSQL documentation
The authoritative reference for PostgreSQL query syntax, functions, data types, and execution behavior.
This lab targets transferable operational SQL fluency with original prompts and a fictional dataset.