D426 Mastery vs SQLite

Stop stressing about D426. Start mastering it. D426 Mastery is the #1 study app built specifically for WGU students preparing for the D426 Data Management Foundations Objective Assessment. Every flashcard, every quiz question, and every sample database is designed to help you pass your OA with confidence. SPACED REPETITION FLASHCARDS - 400+ flashcards covering every D426 competency - Anki-style SM-2 algorithm that adapts to your knowledge - Cards you struggle with show up more often -- cards you know fade away - Search, browse, and filter by topic MOCK OA EXAMS - 200+ exam-style multiple choice questions - Randomized answer positions so you actually learn, not memorize patterns - Review every missed question with the correct answer and detailed explanation - Topic-based quizzes to target your weak areas REAL SQL PLAYGROUND - Write and execute actual SQL queries -- not just theory - 5 realistic sample databases: University, Sales, Hospital, Employee, Inventory - Syntax highlighting, formatted result tables, and query history - Practice DDL and DML commands against real data INTERACTIVE ER DIAGRAM BUILDER - Drag-and-drop entities, attributes, and relationships - Crow's Foot notation with cardinality validation - Build and visualize database designs hands-on COMPLETE TOPIC COVERAGE - Relational Model Concepts - ER Diagrams and Crow's Foot Notation - Primary Keys and Foreign Keys - Database Normalization (1NF, 2NF, 3NF, BCNF) - SQL DDL Commands (CREATE, ALTER, DROP) - SQL DML Commands (SELECT, INSERT, UPDATE, DELETE) - Conceptual, Logical and Physical Data Models - DBMS Architecture and ACID Properties SMART PROGRESS TRACKING - Mastery percentage for every topic - Radar chart showing your strengths and weak spots - OA Readiness score -- know exactly when you're ready to test - Study streak counter and daily session timer - Detailed statistics: cards reviewed, quizzes taken, accuracy rate SEARCHABLE GLOSSARY - 90+ database terms with clear definitions - Organized by category for quick reference - Perfect for last-minute review before your OA FREE VS PREMIUM Free includes: - 50 flashcards with full spaced repetition - 1 mock OA exam per day - 1 sample SQL database - Complete glossary - Basic study statistics Premium unlocks: - All 400+ flashcards - Unlimited mock OA exams - All 5 SQL databases - Missed questions review after every quiz - OA Readiness score - Interactive ER Diagram Builder - Advanced analytics Premium is available as a monthly subscription ($7.99/month, auto-renewing) or a one-time lifetime purchase ($24.99). Monthly subscriptions automatically renew unless canceled at least 24 hours before the end of the current billing period. Manage or cancel anytime in your Apple ID account settings. WORKS 100% OFFLINE No internet required. No account needed. No data leaves your device. Study anywhere -- on the bus, in bed, between classes. BUILT BY WGU STUDENTS, FOR WGU STUDENTS We know the D426 OA because we've been there. Every flashcard and quiz question is mapped to actual course competencies so you study what matters. D426 Mastery is an independent study aid and is not affiliated with, endorsed by, or sponsored by Western Governors University. Support: https://johndisalle.github.io/D426/support Terms of Service: https://johndisalle.github.io/D426/terms-of-service Privacy Policy: https://johndisalle.github.io/D426/privacy-policy

SQLite: SQL Practice Stop watching SQL tutorials. Start writing real queries. SQLite: SQL Practice is the hands-on way to master SQL — from your first SELECT to advanced JOINs and subqueries — by actually writing code against real, interesting data. No multiple-choice shortcuts. No internet required. LEARN BY DOING, NOT BY GUESSING
Most SQL apps test you with multiple-choice questions. Here, you write every query yourself in a real SQLite editor — because the only way to truly learn SQL is to type it, run it, and see the results. DATA YOU'LL ACTUALLY WANT TO QUERY
Forget the boring "employees" and "students" tables from every textbook. Explore datasets you'll genuinely enjoy — and stay motivated while you practice everything from basic filters to complex aggregations. FROM BEGINNER TO ADVANCED, AT YOUR PACE
Start with simple SELECT statements and progress step by step to advanced queries. Whether you're preparing for a technical interview, a data analytics course, or your first developer job, the path is laid out for you. BUILD YOUR OWN PRACTICE PLAYGROUND
Create your own tables and fill them with whatever data you want. Practice the exact queries you need for work, school, or interviews — your database, your rules. TAKE YOUR WORK WITH YOU
Export your tables and exercises to CSV or PDF with a clean, professional design. Perfect for sharing with classmates, attaching to study notes, or showing your progress. MAKE IT YOURS
Choose from five beautiful, professional themes and practice in an editor that matches your style. PRACTICE ANYWHERE — 100% OFFLINE
On a plane, on the subway, at the beach. Everything runs on your device, so you can practice SQLite anytime, with zero connection needed. Download SQLite: SQL Practice and turn "I'm learning SQL" into "I know SQL."