Python & SQL Pro vs SQL Practice

A reference of everyday Python, from strings and collections to threading and design patterns. Every example is written out in full and explained. • 22 sections: simple types, arrays and collections, classes, files, serialization, functions and lambdas, exceptions, regular expressions, threading, databases, algorithms, patterns. • Run in the app: the example really executes and the output appears under the code. Needs an internet connection; the daily limit is 30 launches. • What changed in new versions: eight sections from Python 3.0 to 3.13, with "before" and "after" code side by side. • Keyword and function reference: 203 articles, browsable as a list and searchable. • SQL alongside: 243 queries against a live practice database - JOIN, GROUP BY, subqueries, data types. Queries have their own daily count. • Edit any example and run it again; one tap brings the original back. • Add your own examples - they are kept in the app and always at hand. • Search by section name or by a fragment of code. • Everything except running works offline: examples, search, favourites. No account needed. • Light and dark themes, font and size, line numbers, soft wrapping. Every example is picked from trusted sources and thoroughly tested. Made by a developer for developers. In development since 2015.

Learn SQL in 15-minute daily sessions — on your phone, anywhere. SQL Practice turns idle moments into practical data skills. With interactive exercises, realistic datasets, and instant feedback, you’ll build SQL confidence from beginner fundamentals to interview-ready skills. Who it’s for: - Career changers entering tech - Professionals adding SQL to their toolkit - Students preparing for technical interviews - Anyone curious about data and databases Why it’s different: - Learn by doing: write and run real SQL queries - SQL Patterns (Pro): understand reusable approaches instead of memorizing answers - Database Bits (Pro): build intuition with short, visual lessons - Smarter feedback (Pro): see why your result differs from the expected output - Progressive curriculum: start with the fundamentals and advance at your own pace - Mobile-first design: practice whenever you have a few spare minutes When you get stuck: With Pro, SQL Practice helps you move forward without immediately giving away the answer. Use progressive hints, compare your results with the expected output, and explore SQL X-Ray explanations that break queries into understandable steps. What you’ll learn: - SELECT, WHERE, ORDER BY, and filtering - JOINs and relationships between tables - COUNT, SUM, AVG, GROUP BY, and HAVING - Subqueries and advanced query techniques - Reusable SQL patterns (Pro) - Core database concepts, indexes, and data design (Pro) Practice your way: - Guided SQL lessons - Easy, medium, and hard exercises - Quick drills - Short visual database lessons (Pro) - Daily practice challenges - Streaks, XP, achievements, and progress tracking - Hardcore mode: turn off the advanced SQL keyboard and solve the toughest challenges without assistance—the highest level of SQL practice. Free and Pro: Core SQL lessons, exercises, drills, streaks, and basic progress tracking are free. An optional auto-renewing Pro subscription unlocks SQL Patterns, Database Bits, progressive hints, detailed result comparisons, and SQL X-Ray step-by-step explanations. Available plans, billing periods, trial eligibility, and localized prices are shown before purchase. No purchase is required to use the core learning and practice features. Start your data journey today — no prior coding experience required, just 15 minutes of curiosity. Privacy Policy: https://martongreber.github.io/mvp/privacy.html Terms of Use: https://martongreber.github.io/mvp/terms.html