DB Learn
Contains ads
Everyone
info
0+
Downloads
Everyone
Learn more
About this app
DBLearn is a complete, offline-first course on databases and SQL — designed to take you from "what is a database?" to enterprise-level schema design, no internet connection required.
WHY DBLEARN?
Most SQL apps are either flashcard quizzes or bare-bones playgrounds. DBLearn combines both with a structured curriculum, so every concept you learn is immediately backed by hands-on practice on real SQLite databases — right on your device.
WHAT YOU'LL LEARN
DBLearn takes you through 6 in-depth chapters, from foundational concepts to production-ready database design:
- What is a database? — data vs information, flat file problems, database types, DBMS architecture, SQLite internals, and ACID properties
- Tables & relations — table anatomy, data types, primary keys, foreign keys, constraints, and normalisation (1NF through 3NF)
- SQL basics — SELECT statements, filtering with WHERE, aggregate functions and GROUP BY, INSERT/UPDATE/DELETE, sorting, pagination, and string/date functions
- JOINs — INNER JOIN, LEFT JOIN and anti-joins, multi-table joins, self joins, and subqueries (scalar, IN, EXISTS, derived tables)
- Advanced SQL — CTEs and recursive queries, window functions (RANK, LAG, LEAD), transactions and savepoints, query optimisation with EXPLAIN, views and triggers
- Enterprise design — ER diagrams, schema migrations, common design patterns (soft deletes, audit logs, state machines), and performance tuning at scale
EVERY LESSON IS STRUCTURED FOR LEARNING
Lessons combine clear explanations, annotated code examples, key-term callouts, "try it yourself" prompts, and diagrams — so concepts stick before you move on.
SQL PLAYGROUND — WRITE REAL QUERIES
Practice on multiple pre-loaded sample databases (e-commerce, school, hospital, and HR), each with realistic schemas and seed data. Write and run any SQL — SELECT, JOIN, CREATE TABLE, and more — and see results instantly in a clean, terminal-inspired interface.
You can also create your own custom databases from scratch and design your own schemas.
Features include:
- Query history with timing and error tracking
- Saved query snippets with tags
- Table browser with schema, foreign keys, and row counts
- CSV export of results
- Reset any database back to its original seed data
CHAPTER QUIZZES — 500+ QUESTIONS
Test your understanding with quizzes drawn from a pool of 500+ questions across all difficulty levels — easy, medium, hard, and expert. Each session gives you 50 random questions with detailed explanations after every answer, plus a review of anything you got wrong.
SQL CHALLENGES — SOLVE REAL PROBLEMS
Put your skills to the test with 24 hands-on coding challenges, from simple SELECT statements to expert-level window functions, cohort analysis, and running totals. Each challenge includes hints, sample solutions, and instant validation against expected results.
TRACK YOUR PROGRESS
DBLearn keeps track of completed lessons, quiz scores, and solved challenges — all stored locally on your device. See your overall progress at a glance from the home screen, with per-chapter completion tracking.
100% OFFLINE — NO ACCOUNT NEEDED
There are no logins, no ads, and no internet connection required. Everything — lessons, the SQL playground, quizzes, and your progress — works completely offline using a local SQLite database.
WHO IS THIS FOR?
- Students learning databases for the first time
- Developers brushing up on SQL fundamentals
- Anyone preparing for technical interviews involving SQL
- Self-learners who want a structured path from beginner to advanced
Whether you're writing your first SELECT statement or optimising complex queries with window functions, DBLearn gives you the theory, the practice environment, and the feedback to actually learn database mastery — at your own pace, anywhere.
WHY DBLEARN?
Most SQL apps are either flashcard quizzes or bare-bones playgrounds. DBLearn combines both with a structured curriculum, so every concept you learn is immediately backed by hands-on practice on real SQLite databases — right on your device.
WHAT YOU'LL LEARN
DBLearn takes you through 6 in-depth chapters, from foundational concepts to production-ready database design:
- What is a database? — data vs information, flat file problems, database types, DBMS architecture, SQLite internals, and ACID properties
- Tables & relations — table anatomy, data types, primary keys, foreign keys, constraints, and normalisation (1NF through 3NF)
- SQL basics — SELECT statements, filtering with WHERE, aggregate functions and GROUP BY, INSERT/UPDATE/DELETE, sorting, pagination, and string/date functions
- JOINs — INNER JOIN, LEFT JOIN and anti-joins, multi-table joins, self joins, and subqueries (scalar, IN, EXISTS, derived tables)
- Advanced SQL — CTEs and recursive queries, window functions (RANK, LAG, LEAD), transactions and savepoints, query optimisation with EXPLAIN, views and triggers
- Enterprise design — ER diagrams, schema migrations, common design patterns (soft deletes, audit logs, state machines), and performance tuning at scale
EVERY LESSON IS STRUCTURED FOR LEARNING
Lessons combine clear explanations, annotated code examples, key-term callouts, "try it yourself" prompts, and diagrams — so concepts stick before you move on.
SQL PLAYGROUND — WRITE REAL QUERIES
Practice on multiple pre-loaded sample databases (e-commerce, school, hospital, and HR), each with realistic schemas and seed data. Write and run any SQL — SELECT, JOIN, CREATE TABLE, and more — and see results instantly in a clean, terminal-inspired interface.
You can also create your own custom databases from scratch and design your own schemas.
Features include:
- Query history with timing and error tracking
- Saved query snippets with tags
- Table browser with schema, foreign keys, and row counts
- CSV export of results
- Reset any database back to its original seed data
CHAPTER QUIZZES — 500+ QUESTIONS
Test your understanding with quizzes drawn from a pool of 500+ questions across all difficulty levels — easy, medium, hard, and expert. Each session gives you 50 random questions with detailed explanations after every answer, plus a review of anything you got wrong.
SQL CHALLENGES — SOLVE REAL PROBLEMS
Put your skills to the test with 24 hands-on coding challenges, from simple SELECT statements to expert-level window functions, cohort analysis, and running totals. Each challenge includes hints, sample solutions, and instant validation against expected results.
TRACK YOUR PROGRESS
DBLearn keeps track of completed lessons, quiz scores, and solved challenges — all stored locally on your device. See your overall progress at a glance from the home screen, with per-chapter completion tracking.
100% OFFLINE — NO ACCOUNT NEEDED
There are no logins, no ads, and no internet connection required. Everything — lessons, the SQL playground, quizzes, and your progress — works completely offline using a local SQLite database.
WHO IS THIS FOR?
- Students learning databases for the first time
- Developers brushing up on SQL fundamentals
- Anyone preparing for technical interviews involving SQL
- Self-learners who want a structured path from beginner to advanced
Whether you're writing your first SELECT statement or optimising complex queries with window functions, DBLearn gives you the theory, the practice environment, and the feedback to actually learn database mastery — at your own pace, anywhere.
Updated on
Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
No data collected
Learn more about how developers declare collection
What’s new
Welcome to DBLearn — learn databases and SQL completely offline.
This first release includes:
- 6 in-depth chapters covering everything from database basics to enterprise schema design
-
This first release includes:
- 6 in-depth chapters covering everything from database basics to enterprise schema design
-
