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SqlInt: SQL Practice & Interview Workspace
Solve interview-style SQL problems, explore real-world case studies, play story-driven puzzles, and track progress — all in one clean workspace.
Free to start · Pro plans from ₹199/mo
Questions
Puzzles
Case Studies
Roadmap Topics
Challenges
to Start
Features
Learning Roadmap
27 topics with syntax, examples, common mistakes, and interview tips
SQL Playground
List the name, role, and salary of employees earning over $70,000 — highest salary first.
💡 Compare salary with > and sort with ORDER BY … DESC.
SELECT name, role, salary
FROM employees
WHERE salary > 70000
ORDER BY salary DESC;3 rows · 3 ms
| name | role | salary |
|---|---|---|
| Aisha Khan | Data Engineer | 92000 |
| Ravi Menon | Analyst | 78000 |
| Sara Lee | Analyst | 74000 |
SQL Puzzles
Start with these four free puzzles — solve crimes, pull off heists, and unearth secrets using SQL
Case Studies
Full schemas, datasets, solutions, and explanations from actual industry scenarios
Mini Tools
No signup, no backend round-trips — format, convert, and generate right on the page
Catch anti-patterns, style issues, and risky constructs before they ship
Ship cleaner SQL — catch anti-patterns before review.
Beautify messy queries in 7 dialects
Turn messy one-liners into readable queries in a click.
See how INNER, LEFT, RIGHT & FULL work
Finally see what each JOIN actually returns.
Articles
Guides, deep dives, and practical SQL tips — written to make you interview-ready
Practice real interview questions right in your browser — instant feedback, story-driven puzzles, and a full learning roadmap. No setup required.
Free to start · Pro plans from ₹199/mo
// FAQ
Start with the free SQL practice questions, then work through the 27-topic roadmap and the story-driven puzzles. Every question includes a schema, hints, and an in-browser SQL editor with instant feedback — no setup or database installation required.
Yes — practice is free to start. You just need a free account to open the SQL editor and solve questions, which also keeps your progress saved. The complete 27-topic learning roadmap and all 12 mini tools work without an account, and optional Pro packs unlock the full question bank, all puzzles, and all case studies.
Practice questions run on SQLite (via sql.js) and SQL puzzles on PostgreSQL (via PGlite), both executed locally in your browser. SqlInt is not a MySQL or SQL Server practice environment.
No. Everything runs in your browser through WebAssembly — the SQL editor, schema, sample data, and result comparison all work client-side, so you can practice instantly on any device.
Prioritize SELECT and filtering, JOINs, GROUP BY and aggregations, window functions, and CTEs and subqueries. The roadmap marks each topic by level, and the interview-tip sections cover the exact patterns interviewers ask about.
The fastest way is to solve real problems in a real query editor. Start with easy filtered queries, then move to JOINs, aggregations, and window functions. SqlInt gives you an in-browser editor with instant result comparison, so every practice session builds directly toward interview questions.
Yes. The question bank mirrors the patterns used in real data-analyst, data-engineer, and backend interviews — joins, aggregations, deduplication, window functions, and ranking problems. Every unlocked question includes a reference solution, an explanation, and progressive hints; the full premium bank is part of the paid challenge packs.
Absolutely. Start with the 27-topic learning roadmap, which walks you from basics to advanced topics with examples, common mistakes, and interview tips for each level. Then apply what you learned on the easy practice questions and story-driven puzzles.