About the PostgreSQL runner
Use the left-hand editor to run a small PostgreSQL idea without setting up a project first. The PostgreSQL playground is built for query practice in the page, not for a full postgres server with extensions and background workers. Run it. Read the output. Then change one thing, because the fastest debugging session is usually the one with the fewest moving parts.
We built this page for short checks: SELECTs, joins, CTE sketches, aggregates, and schema-reading practice. It is deliberately narrower than a local environment, and that is the point; when a snippet is only twenty lines long, a full toolchain can get in the way of the question you actually have.
PostgreSQL-specific features such as RETURNING, arrays, JSONB, extensions, and strict type casts may not all be represented. It is useful for learning joins and grouping. It is not where you decide index strategy.
Before you press Run
- Start with the smallest PostgreSQL snippet that can show the behavior.
- Add input only when the program reads it. Empty STDIN is a valid test case.
- Press Run, inspect stdout and stderr, then change one line. That rhythm keeps accidental fixes from hiding the real bug.
The mechanics are simple. We keep the run cycle compact because this page is meant to answer one question at a time, not manage a full project tree.
That style also makes the result easier to share. A reader can scan a short PostgreSQL snippet, run it, and see the same error without first recreating your directory structure or guessing which dependency you forgot to mention.
Limits first
This page is strongest when the problem is small and visible. It is weakest when the problem depends on extensions, roles, transactions with concurrency, EXPLAIN plans, and large data sets. Two caveats.
- Do not paste secrets, tokens, private URLs, or customer data.
- The environment is intentionally constrained, so a snippet that works here still deserves a local check when compiler flags, packages, server state, or exact versions matter.
- Timeouts are normal for runaway loops. They protect the shared runner.
We deliberately keep the sandbox narrow. That makes the output easier to trust for SELECTs, joins, CTE sketches, aggregates, and schema-reading practice, while making it clear when you have outgrown the page.
One practical test: if you cannot explain the snippet in one sentence, split it. The runner is happiest when each run answers a single question, and you will be happier too when the error message points at one idea instead of a pile of guesses.
FAQ notes
Only a few questions belong here. The goal is to answer the mistakes that actually interrupt a small PostgreSQL run, not to pad the page.
How to compile PostgreSQL extensions for i386?
Compiling PostgreSQL extensions for i386 is a native build task, not something an online SQL editor can do. You need PostgreSQL server headers, a C compiler, make tools, and the target architecture environment. For learning SQL, stay here. For extension builds, use a local or CI machine that matches the deployment target. A three-row table is usually enough to expose a bad join, alias, or filter.
How to compile a procedure in PostgreSQL?
In PostgreSQL, you create a procedure with CREATE PROCEDURE and call it with CALL procedure_name(...). PL/pgSQL functions and procedures are stored in the database, not compiled into a separate executable by hand. If the body fails, read the error line carefully and test the smallest block first. Once the tiny query is correct, add the larger schema details back slowly.
Does my data stay saved after I close the browser?
Assume it does not stay saved. Online SQL editors usually reset data when the page reloads, the session expires, or the sample database is recreated. Keep your CREATE TABLE and INSERT statements in your own notes so you can rebuild the same test data quickly. A short setup script is usually safer than trusting browser state to remember your work.
Can I run full-text searches in an online editor?
You may be able to practice the shape of full-text search, such as to_tsvector and plainto_tsquery, if the playground supports those functions. Do not assume ranking, indexes, dictionaries, or performance match a real PostgreSQL server. For production search, test with real data and the same PostgreSQL version. Once the tiny query is correct, add the larger schema details back slowly.
Workflows that fit
Use it when you are stuck on someone else's machine, teaching a small concept, or separating a language question from a project question. No ceremony.
It also works well as a note-taking tool: paste the final snippet into your lesson, issue, or commit message after you have proved it in the runner.
Keep the example slightly smaller than feels natural. That sounds fussy, but it prevents a common debugging mistake: changing five pieces of code, getting a different result, and no longer knowing which piece mattered.
Where to learn more
Reference pages are better than folklore when an error message gets specific. Start with official docs, then use tutorials for context once the rule is clear.
Related compilers
One last practical note: keep a tiny passing snippet next to the failing one. The comparison often makes the missing assumption obvious, and it keeps the page useful without turning a quick runner into a pretend project workspace.