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a) Define supertype and subtypes. b)Define correctly some attributes for supertype and subtypes. c) Check supertype-subtype structure if it is correctly defined. d) Define one relationship for supertype-subtype.

a) Define supertype and subtypes. b)Define correctly some attributes for supertype and subtypes. c) Check supertype-subtype structure if it is correctly defined. d) Define one relationship for supertype-subtype.

Database Systems: Design, Implementation, & Management
Database Systems: Design, Implementation, & Management
12th Edition
ISBN:9781305627482
Author:Carlos Coronel, Steven Morris
Publisher:Carlos Coronel, Steven Morris
Chapter4: Entity Relationship (er) Modeling
Section: Chapter Questions
Problem 7RQ
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Database system Items Supervisor, Teacher, Year, Graduate, Student, Ungraduate. Consider subtype-supertype structure for above items and answer the following a) Define supertype and subtypes. b)Define correctly some attributes for supertype and subtypes. c) Check supertype-subtype structure if it is correctly defined. d) Define one relationship for supertype-subtype.
Regarding to questions related to Entity Relationship Diagram, all answen should use the similar writing notations for ERD provided below; ERD1 This ERD will be written as; Entity ve Atrributes ENTITY A (# id, * atr1, o atr2) ENTITY B (# nbr, * atr_1, * atr_2) Relationship (by using ERDish) Each Entity-A Optionality Relationship_Name Cardinality Entity-B Each Entity-B Optionality Relationship_Name Cardinality Entity-A ERDZ This ERD must be shown as; SUPERTYPE: A (defining attributes with correct optionality) SUBTYPE: B (defining attributes with correct optionality) SUBTYPE: C (defining attributes with correct optionality) Items: Supervisor, Teacher, Year, Graduate, Student, Undergraduate
Transcribed Image Text:Regarding to questions related to Entity Relationship Diagram, all answen should use the similar writing notations for ERD provided below; ERD1 This ERD will be written as; Entity ve Atrributes ENTITY A (# id, * atr1, o atr2) ENTITY B (# nbr, * atr_1, * atr_2) Relationship (by using ERDish) Each Entity-A Optionality Relationship_Name Cardinality Entity-B Each Entity-B Optionality Relationship_Name Cardinality Entity-A ERDZ This ERD must be shown as; SUPERTYPE: A (defining attributes with correct optionality) SUBTYPE: B (defining attributes with correct optionality) SUBTYPE: C (defining attributes with correct optionality) Items: Supervisor, Teacher, Year, Graduate, Student, Undergraduate
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