René's URL Explorer Experiment

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{"@context":"https://schema.org","@type":"FAQPage","mainEntity":[{"@type":"Question","name":"How do I practice SQL for interviews?","acceptedAnswer":{"@type":"Answer","text":"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."}},{"@type":"Question","name":"Is SqlInt free?","acceptedAnswer":{"@type":"Answer","text":"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."}},{"@type":"Question","name":"Which SQL engine do the practice questions run on?","acceptedAnswer":{"@type":"Answer","text":"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."}},{"@type":"Question","name":"Do I need to install a database to practice SQL?","acceptedAnswer":{"@type":"Answer","text":"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."}},{"@type":"Question","name":"What SQL topics should I focus on for a data analyst interview?","acceptedAnswer":{"@type":"Answer","text":"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."}},{"@type":"Question","name":"What is the best way to practice SQL online?","acceptedAnswer":{"@type":"Answer","text":"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."}},{"@type":"Question","name":"Does SqlInt provide real SQL interview questions with solutions?","acceptedAnswer":{"@type":"Answer","text":"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."}},{"@type":"Question","name":"I'm a complete SQL beginner — can I use SqlInt?","acceptedAnswer":{"@type":"Answer","text":"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."}}]}