Question
20. When one-to-one relationship in E-R model is mapped into relational data model, the one-to-one relationship is generally represented as a. a primary key. b.
20. When one-to-one relationship in E-R model is mapped into relational data model, the one-to-one relationship is generally represented as a. a primary key. b. a foreign key. c. a primary key in one table and a foreign key in another table or the same table of the primary key. d. a table with a pair of foreign keys, each of which is associated to a primary key in its parent table.
21. When one-to-many relationship in E-R model is mapped into relational data model, the one-to-one relationship is generally represented as a. a primary key. b. a foreign key. c. a primary key in one table and a foreign key in another table or the same table of the primary key. d. a table with a pair of foreign keys, each of which is associated to a primary key in its parent table.
22. When many-to-many relationship in E-R model is mapped into relational data model, the one-to-one relationship is generally represented as a. a primary key. b. a foreign key. c. a primary key in one table and a foreign key in another table or the same table of the primary key. d. a table with a pair of foreign keys, each of which is associated to a primary key in its parent table.
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Object Databases The Essentials
Authors: Mary E. S. Loomis
1st Edition
020156341X, 978-0201563412
