Online SQL Compiler
Real PostgreSQL, running in your session. Create tables, insert rows and query them in one go — the results of your last SELECT appear below.
Running code needs a free account. Write and edit here as much as you like — pressing Run asks you to sign in. It is free, takes about a minute, and covers all five languages plus graded exercises.
Create free accountHow this SQL compiler works
This is genuine PostgreSQL compiled to WebAssembly, not an emulator — so Postgres-only syntax like ILIKE, SERIAL, JSONB and window functions all behave correctly.
Frequently asked questions
Is this really PostgreSQL?
Yes — Postgres compiled to WebAssembly, so features other online SQL tools get wrong (ILIKE, SERIAL, JSONB, FILTER, window functions) work properly.
Does my data persist?
No. Each run gets a fresh, empty database, so include your CREATE TABLE and INSERT statements above your query.
Is this SQL compiler really free?
Yes — free, with no card and no trial. It needs a free account, because running code costs real server time and an account is how we keep that fair for everyone. Signing up takes about a minute.
Do I need to install anything?
No. Everything runs on our servers and the results come back to your browser. Nothing to download, no setup, works on a phone.
Can I use this for interview practice?
Yes, and there are graded exercises with hidden test cases if you want feedback rather than just output — those need a free account.
Want feedback, not just output?
A free account unlocks graded exercises — you write a solution, it runs against hidden test cases, and you are told exactly which ones fail and why. Plus structured courses in SQL and 17 other paths.
Create a free account