Object-Based Databases
CAD tools are typically used in a programming language envi-ronment needing to access the database. b. A system to track contributions made to candidates for public office: A relational system would be apt for this, as data types are ex-pected to be simple, and a powerful querying mechanism is es-sential. c.
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Introduction to the Relational Model
www.db-book.com2 Chapter 2 Introduction to the Relational Model 2.3 Consider the time slot relation. Given that a particular time slot can meet more than once in a week, explain why day and start time are part of the primary key of this relation, while end time is not. Answer: The attributes day and start time are part of the primary key since a particular class will most likely meet on several different days,
Intermediate SQL - Database System Concepts
www.db-book.com24 Chapter 4 Intermediate SQL create table takes (ID varchar (5),course id varchar (8), section id varchar (8), semester varchar (6), year numeric (4,0), grade varchar (2), primary key (ID, course id, section id, semester, year), foreign key (course id, section id, semester, year) references section on delete cascade, foreign key (ID) references student on delete cascade); create …
Relational Database Design - Database System Concepts
www.db-book.comwould amount to simply setting the value of a to null in some tuples. c. For every schema r i(ab) added to the schema because of a rule a → b,ashouldbemadetheprimarykey.Also,acandidatekeyg for the original relation is located in some newly created relation r k, and is a primary key for that relation.
Database Design and the E-R Model
www.db-book.com4 Chapter 7 Database Design and the E-R Model A B R B E R C R A C Figure 7.5 E-R diagram for Exercise 7.6b. A B R B E R C R A C Figure 7.6 E-R diagram for Exercise 7.6d. b. See Figure 7.5. The idea is to introduce total participation constraints between E and the relationships RA, RB, RC so that every tuple in E has a relationship with A, B and C. c. Suppose Atotally …
Contents
www.db-book.comChapter 8 Complex Data Types 8.1 Semi-structured Data 365 8.2 Object Orientation 376 8.3 Textual Data 382 8.4 Spatial Data 387 8.5 Summary 394 Exercises 397 Further Reading 401 Chapter 9 Application Development 9.1 Application Programs and User Interfaces 403 9.2 Web Fundamentals 405 9.3 Servlets 411 9.4 Alternative Server-Side Frameworks 416
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