Database Design and Entity Relationship Exam: In-Depth Exploration of Entity Supertypes and Subtypes, Subtype/Supertype Relationships, Subtype Discriminators, Disjoint and Overlapping Subtypes, Partial and Total Completeness, Attribute Inheritance, Hierar

Database Design and Entity Relationship Exam: In-Depth Exploration of Entity Supertypes and Subtypes, Subtype/Supertype Relationships, Subtype Discriminators, Disjoint and Overlapping Subtypes, Partial and Total Completeness, Attribute Inheritance, Hierarchical Data Structures, Database Normalization, Data Integrity Constraints, Relational Schema Design, Entity Set Subdivision, Non-Overlapping vs. Overlapping Entity Sets, and Advanced ER Modeling Techniques Exam Questions Verified and Provided with Complete A+ Graded Rationales Latest Updated 2026 Entity Supertype Generic entity type related to one or more entity subtypes. Entity Subtype Contains characteristics of each entity subtype. Subtype/Supertype Relation Every subtype has one supertype, but a supertype can have many subtypes. Subtype Discriminator An attribute of a supertype whose values determine the target subtype or subtypes. Disjoint Subtypes contains unique subset of the supertype entity set, also known as non-overlapping subtypes. Overlapping Subtypes contain non-unique subsets of the supertype entity set. Requires use of one discriminator attribute for each subtype. Partial Completeness Not every supertype occurrence is a member of a subtype. Total Completeness Every supertype occurrence must be a member of at least one subtype. Specialization Lower-level, more specific entity subtypes from a higher-level entity supertype. Generalization Higher-level, more generic entity supertype from lower-level entity subtypes. Virtual Entity type used to represent multiple entities and relationships in the ERD. Primary Key