Database Management D426 | WGU 2025/2026 | 100+ Solved Questions on Normalization, ER Diagrams, Indexing, Joins & SQL Keys | Western Governors University

This WGU D426 Database Management study guide for the 2025/2026 academic year features over 100 solved exam-style questions, precisely aligned with the Western Governors University (WGU) course curriculum. It covers fundamental and advanced topics in relational database design, SQL structure, indexing strategies, normalization, and ER modeling. Structured in a clear Q&A format, this guide is ideal for mastering: Relational Database Design Concepts: Functional dependency, determinant, candidate keys, entity and attribute identification Normal forms (1NF, BCNF), denormalization, trivial dependency, merging tables SQL Schema & Keys: Simple vs. composite primary keys, foreign keys, candidate keys JOIN types: INNER JOIN, CROSS JOIN, and their operational use Data Definition & Storage: DDL commands, tablespaces, table scans vs. index scans Hash indexing, bitmap index, fan-out, transfer rate Indexing & Optimization: Dense/physical index, modulo and dynamic hash functions, sharding, multi-level indexes Horizontal partitioning, conceptual and logical design distinctions Entity Relationship (ER) Modeling: ER diagrams, IsA relationships, supertype/subtype entities, attribute symbols (circle, square), directionality of verbs in relationships SQL Logic & Properties: Aggregating functions (e.g., MIN), NOT NULL, CHECK constraints, INSERT behavior with FK enforcement Distributed & Federated Systems: Multi-tier architecture, node clusters, federated databases, distributed DB management Advanced Topics: Subject areas, tuple identification, correlated subqueries, flattening techniques Perfect for: Students enrolled in WGU’s D426 Database Management course Learners prepping for WGU proctored assessments or final exams IT professionals reviewing core database theory and implementation Developers working on relational models and schema designs Every term or question is paired with a concise, correct answer, reinforcing exam readiness and concept clarity. Keywords: WGU D426, database management exam, normalization forms, ER diagram symbols, foreign key SQL, candidate key, hash index, bitmap index, SQL JOIN types, logical design, conceptual model, sharding, data mart, federated database, primary key types, functional dependency, SQL constraints, index scan, multi-tier architecture, relational rules