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Intermediate SQL - Database System Concepts
Intermediate SQL Practice Exercises 4.1 Write the following queries in SQL: a. Display a list of all instructors, showing their ID, name, and the num-ber of sections that they have taught. Make sure to show the number of sections as 0 for instructors who have not taught any section. Your query should use an outerjoin, and should not use scalar ...
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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,
Object-Based Databases
www.db-book.comCAD 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.
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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