D426 Mastery vs Database Keys and Constraints

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

Database Keys and Constraints is an independent study app for learners who want focused practice on relational database design rules, SQL integrity concepts, and exam-style reasoning. Use it to review fundamentals, build practical skills, avoid common pitfalls, and explore advanced concepts across 160 questions. Every question includes an explanation, so you can learn why an answer is right and where mistakes usually happen. Features: - 160 questions on keys, constraints, relationships, and design logic - Spaced repetition using FSRS intervals - Weak-point heatmap to target fragile areas - Daily challenge for steady review - Mock exams for timed practice - Clear explanations for every question - Offline practice, no login required Built for students, interview preparation, database course review, and anyone strengthening SQL schema design knowledge. Independent study app for Database Keys and Constraints practice. Not affiliated with, endorsed by, or sponsored by any company, certification body, exam operator, or vendor. All trademarks belong to their respective owners. Practice offline, no login required.