Introduction to Databases
Exam Answer Key
Course Introduction
Introduction to Databases offers a comprehensive overview of the fundamental concepts and principles that underpin modern database systems. Students will explore data models, relational algebra, and SQL for data manipulation and retrieval. The course covers database design techniques, including entity-relationship modeling and normalization, as well as essentials of database management such as indexing, transactions, security, and concurrency control. Through hands-on projects and real-world examples, students will gain practical skills in creating and managing databases, preparing them for further study and careers in data-centric fields.
Recommended Textbook
Database Systems Introduction to Databases and Data Warehouses 1st Edition by Nenad Jukic
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10 Chapters
752 Verified Questions
752 Flashcards
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Chapter 1: Introduction
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Sample Questions
Q1) What is the difference between developing the initial and subsequent versions of the database system?
Answer: Unlike with the initial version,in the subsequent versions not all requirements will be collected from scratch.Original requirements provide the starting point for additions and alterations.Many of the additions and modifications result from observations and feedback by the end users during the use of the previous version,indicating the ways in which the database system can be improved or expanded.Other new requirements may stem from changes in the business processes that the database system supports,or changes in underlying technology.
Q2) Conceptual data modeling is another term for requirements visualization.
A)True
B)False
Answer: True
Q3) The terms data and information should never be used as synonyms for each other. A)True
B)False
Answer: False
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Chapter 2: Database Requirements and ER Modeling
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Sample Questions
Q1) Which of the following is true according to the ZYX Company ER diagram?
A)A customer cannot be referred by another customer
B)A customer can be referred by at most one customer
C)A customer can be referred by many customers
D)A customer must be referred by another customer
Answer: B
Q2) In the ER Diagram for the SUNSHINE AIRLINE COMPANY,which word should replace qqq?
A)AirplaneTypeID
B)NoOfEngines
C)AirportID
D)LengthOfRunway
Answer: D
Q3) An optional attribute occurs only in an entity that is involved in a relationship with optional participation.
A)True
B)False
Answer: False
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4
Chapter 3: Relational Database Modeling
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Sample Questions
Q1) If in the GENERIC ERD the Symbol 1 is >| and the Symbol2 is 0|,then the number of columns in the relational schema resulting from mapping the GENERIC ERD is 5.
A)True
B)False
Answer: True
Q2) During mapping of the ZYX Company ERD into a relational schema,attribute OfficePhoneNumber from the ZYX Company ER diagram will be mapped as a column of the relation EMPLOYEE.
A)True
B)False Answer: True
Q3) If in the GENERIC ERD the Symbol 1 is >| and the Symbol2 is 0|,then the number of optional columns in the relational schema resulting from mapping the GENERIC ERD is 0. A)True
B)False
Answer: False
Q4) Give a definition of entity integrity constraint. Answer: In a relational table,no primary key column can have null (empty)values.
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Page 5
Chapter 4: Update Operations, update Anomalies, and Normalization
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Sample Questions
Q1) Update operations are also referred to as read operations.
A)True
B)False
Q2) Functional dependency Type --> OwnerID exists in the table VEHICLE.
A)True
B)False
Q3) Table ENROLLMENT is:
A)Not in 1NF
B)In 1NF but not in 2NF
C)In 2NF but not in 3NF
D)In 3NF
Q4) When does a functional dependency occur?
Q5) Functional dependency VehicleID --> OwnerID exists in the table VEHICLE.
A)True
B)False
Q6) Every relation without transitive functional dependencies is in 3NF.
A)True
B)False
Q7) What is necessary redundancy in a relational database?
Q8) In what two different ways is the term update operation often used? Page 6
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Page 7
Chapter 5: SQL
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Sample Questions
Q1) Write an SQL statement for the HAPPY INSURANCE database that creates a view that contains,for each agent,the agent name and the headquarter city of his or her area.
Q2) The following query on table VEHICLE will return 4 values: SELECT ownerid FROM vehicle; A)True B)False
Q3) Write an SQL query for HAPPY INSURANCE database that will for each area display the area ID,area name,and average rating for all agents in the area.
Q4) Which of the following statements would be used to change a value in a record of a table?
A)CREATE TABLE
B)ALTER TABLE
C)INSERT INTO
D)UPDATE
Q5) What is the purpose of the CREATE TABLE command?
Q6) Show the INSERT INTO statements for the table STUDENT.
Q7) Write an SQL statement for the HAPPY INSURANCE database that moves the agent whose agent ID value is A3 to the area whose area ID is 1.
Page 8
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Chapter 6: Database Implementation and Use
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Sample Questions
Q1) Which of the following describes the completeness data quality characteristic?
A)The degree to which all the required data is present in the data collection
B)The characteristic that requires each real-world instance to be represented only once in the data collection
C)The extent to which the data properly conforms to and matches up with the other data
D)The degree to which the data is aligned with the proper time window in its representation of the real world
Q2) Which of the following describes the consistency data quality characteristic?
A)The degree to which all the required data is present in the data collection
B)The extent to which the data properly conforms to and matches up with the other data
C)The extent to which data correctly reflects the real world instances it is supposed to depict
D)The extent to which the data conforms to its specified format
Q3) What is the purpose of an index?
Q4) What are corrective data quality actions?
Q5) Describe the update restrict option (for implementing a referential integrity constraint).
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Chapter 7: Data Warehousing Concepts
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Sample Questions
Q1) Analytical databases are referred to as application-oriented.
A)True
B)False
Q2) What is a dependent data mart?
Q3) Explain the term retrieval of analytical information in the following data warehouse definition:
The data warehouse is a structured repository of integrated,subject-oriented,enterprise-wide,historical,and time-variant data.The purpose of the data warehouse is the retrieval of analytical information.A data warehouse can store detailed and/or summarized data.
Q4) Operational data typically represents the current state of affairs in the real world,while analytical data can represent both the current situation and snapshots from the past.
A)True
B)False
Q5) What is an independent data mart?
Q6) The operational data sources include the data warehouses and data marts.
A)True
B)False
Q7) List the three major components of every data warehousing system.
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Chapter 8: Data Warehouse and Data Mart Modeling
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Sample Questions
Q1) Based on the data shown in the CUSTOM SPA DAILY VISITS DATABASE,the dimension VISIT in the CUSTOM SPA star schema has ________ records.
A)0 (the dimension VISIT does not exist)
B)3
C)5
D)8
Q2) The detailed fact table in the STATEWIDE HEALTH star schema is a line-item detailed fact table.
A)True
B)False
Q3) The STATEWIDE HEALTH PRESCRIPTIONS database column PrescQuantity provides the data for a dimension in the STATEWIDE HEALTH star schema. A)True B)False
Q4) Transaction time is typically included as a column in the fact table. A)True B)False
Q5) What is a constellation of stars?
Q6) What does granularity of a fact table describe?
Page 11
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Chapter 9: Data Warehouse Implementation and Use
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Sample Questions
Q1) What is a first load?
Q2) The ETL infrastructure is essentially predetermined by the results of the requirements collection and data warehouse modeling processes that specify:
A)The OLAP/BI tools
B)The alpha release
C)The sources and the target
D)The refresh cycle
Q3) Archived data from source systems is never present in the data warehouse.
A)True
B)False
Q4) Which of the following is NOT true? Front-end (BI)applications are used to retrieve the data from:
A)Dependent data marts
B)ETL infrastructure
C)Independent data marts
D)Data warehouse
Q5) What is a data warehouse beta release?
Q6) What enables direct lookup of values in the fact table in a multidimensional cube?
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Chapter 10: Overview of Dbms Functionalities and Database
Administration
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Sample Questions
Q1) What will be the outcome of the following SQL statements issued in the HAPPY INSURANCE database?
CREATE ROLE supervisor;
GRANT SELECT,INSERT,UPDATE ON client TO supervisor; GRANT SUPERVISOR TO shannon;
A)Shannon can read data from CLIENT,change data in CLIENT,change the metadata of CLIENT,insert data in CLIENT
B)Shannon can read data from CLIENT,change data in CLIENT,insert data in CLIENT
C)Shannon can read data from CLIENT,change data in CLIENT,change the metadata of CLIENT
D)Shannon can change the metadata of CLIENT
Q2) Regular monitoring helps the DBA recognize instances when maintenance activities are needed.
A)True
B)False
Q3) What is a common purpose for all database policies and standards?
Q4) What is a checkpoint?
Q5) What is a query optimizer?
Q6) What is a complete mirrored backup?
Q7) What is the purpose of the data administration component of a DBMS? Page 13
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Page 14