DFo Section 2 Quiz

 

1. The logical model becomes the blueprint for designing the ________ model Data Integrity Data Flow Physical (*) Network Correct

(1/1) Points 2. The logical model's entities, attributes, unique identiers and relationships map to the physical model's _________________. _________________. Files, records, elds and data values Optionality and Cardinality Tables, columns, primary keys and foreign keys (*) Incorrect. Refer to Section 2 Lesson 2. (0/1) Points 3. An ERD created using ERDish is a __________ representation of entities and their relationships to each other. technical hierarchical textual graphical (*) Incorrect. Refer to Section 2 Lesson 6. (0/1) Points 4. When mapping a relationship for an ERD relationship names must be included. True (*) False Correct

(1/1) Points 5. The conceptual model does all of the following except: Documents type of operating system to be used. (*) Takes into account regulations and laws goverining the industry being addressed. Describes the needs of the business.

 

Prevents mistakes and misunderstandings. Correct

6. The optionality of a relationship must be either _______ or _______. Mandatory or Optional (*) One or (One or More) Single or Multiple Bidirectional or a single direction Incorrect. Refer to Section 2 Lesson 5. (0/1) Points 7. Matrix Diagrams are used u sed to verify that all ____________ have been identied for an ERD. attributes entities relationships (*) keys Correct

(1/1) Points 8. In a relationship , _________ are used to helped describe the meaning of the th e connection between the entities. crows feet names (*) arrows descriptions Incorrect. Refer to Section 2 Lesson 5. (0/1) Points 9. Which symbol is used to show that a particular attribute is mandatory? * (*) o # &

 

Correct

(1/1) Points 10. An entity may have which of the following? Experiences Instances (*) Tables None of the above Incorrect. Refer to Section 2 Lesson 3.

11. Which of the following statements about attributes are true? (Choose Two) (Choose all correct answers)

They are often adjectives. (*) They must be single valued unless they belong to more than one entity. They are the primary container for data. They describe, qualify, quantify, classify, or specify an entity. (*) Incorrect. Refer to Section 2 Lesson 3. (0/1) Points 12. Primary UIDs are: Useful as an alternative means of identifying instances of an entity, independent of their datatype Always comprised of numbers Mandatory in data modeling (*) Optional in data modeling. Incorrect. Refer to Section 2 Lesson 4. (0/1) Points 13. Unique Identiers… Distinguish one instance of an entity from all other instances of that entity (*) Distinguish all entities in a database Distinguish nothing Distinguish one entity from another. Correct

(1/1) Points

 

14. In the relational model, relationships between relations or tables are created by using? Candidate Keys Composite Keys Primary Keys Foreign Keys (*) Correct

(1/1) Points 15. Flat le databases are generally in plain-text form, where each line holds only one record. True or False? True (*) False Correct

(1/1) Points Previous 1. A model is considered to be Implementation-Free if it can be implemented using  ____ of the database software models such as hierarchical, network or relational. any (*) only one none Correct

(1/1) Points 2. In an ERD diagram how is an optional relationship represented ? With a crows foot With an arrow With a dotted line (*) With a solid line Incorrect. Refer to Section 2 Lesson 6. (0/1) Points 3. An ERD created using ERDish is a __________ representation of entities and their relationships to each other. textual

 

technical hierarchical graphical (*) Incorrect. Refer to Section 2 Lesson 6. (0/1) Points 4. Matrix Diagrams should be developed BEFORE the ERD. True or False? True (*) False Correct

(1/1) Points 5. A relationship can be between ____________. two entities an entity and itself  multiple entities All of the above. (*) Correct

1. A model is considered to be Implementation-Free if it can be implemented using  ____ of the database software models such as hierarchical, network or relational. any (*) only one none Correct

(1/1) Points 2. In an ERD diagram how is an optional relationship represented ? With a crows foot With an arrow With a dotted line (*) With a solid line Incorrect. Refer to Section 2 Lesson 6. (0/1) Points

 

3. An ERD created using ERDish is a __________ representation of entities and their relationships to each other. textual technical hierarchical graphical (*) Incorrect. Refer to Section 2 Lesson 6. (0/1) Points 4. Matrix Diagrams should be developed BEFORE the ERD. True or False? True (*) False Correct

(1/1) Points 5. A relationship can be between ____________. two entities an entity and itself  multiple entities All of the above. (*) Correct

11. In a relational database system, the next step after creating a conceptual data model is to convert it to a _________ . Internal data model Logical data model (*) External data model An entity-relation data model Correct

(1/1) Points 12. The logical model's entities, attributes, unique identiers and relationships map to the physical model's _________________. _________________. Files, records, elds and data values Optionality and Cardinality Tables, columns, primary keys and foreign keys (*)

 

Correct

(1/1) Points 13. Entities are usually u sually _____________. Adjectives Nouns (*) Verbs Adverbs Correct

(1/1) Points 14. An entity may have which of the following? Experiences Instances (*) Tables None of the above Incorrect. Refer to Section 2 Lesson 3. (0/1) Points 15. Attributes that can be divided into smaller subparts are called________________. Single Attribute Mandatory Attribute Composite Attribute (*) Volatile Attribute Incorrect. Refer to Section 2 Lesson 3. (0/1) Points Previous

Which of the following are true about Cardinality? (Choose two) Cardinality tells "how many". (*) Cardinality specifies a counting number (like 1, 2, 3, 3 , 4 etc.) in a relationship. Cardinality specifies whether something is required or not. Cardinality specifies only singularity or plurality, but not a specific plural number. (*)

 

1. In a relationship , _________ are used to helped describe the meaning of the th e connection between the entities. descriptions crows feet names (*) arrows

Incorrect. Refer to Section 2 Lesson 5.

(0/1) Points 2. Which of the following are true about Cardinality? (Choose two) (Choose all correct answers)

Cardinality tells "how many". (*) Cardinality species only singularity or plurality, but not a specic plural number. (*) Cardinality species whether something is required or not. Cardinality species a counting number (like 1, 2, 3, 4 etc.) in a relationship. Correct

(1/1) Points 3. One-to-One relationships have _____________ of one to one in both directions. Naming Cardinality (*) Foreign Keys Optionality Correct

(1/1) Points 4. Which of the following are reasons we create conceptual models? It facilitates discussion; a picture is worth a thousand words It forms important ideal system documentation It takes into account government regulations and laws It forms a sound basis for physical database design All of the above (*) Correct

(1/1) Points

 

5. A conceptual model includes : Only Entities and Relationships (*) Only Entities, Attributes and Relationships Entities, Attributes, Unique Identiers and Relationships Only Entities, Unique Identiers Incorrect. to Section 2and Lesson 2.  ReferAttributes

6. ERDish includes the following except: Optionality Cardinality Relationship Names Data Values. (*) Incorrect. Refer to Section 2 Lesson 5. (0/1) Points 7. Using ERDish, which wording represents cardinality? (Choose Two) (Choose all correct answers)

one or multiple one and only one (*) one or more (*) one only Incorrect. Refer to Section 2 Lesson 6. (0/1) Points 8. In an ERD diagram how is cardinality represented ? (Choose two) (Choose all correct answers)

With a crow's foot (*) With a solid line With a dotted line With a single toe (*) Incorrect. Refer to Section 2 Lesson 6. (0/1) Points 9. In the relational model, relationships between relations or tables are created by using?

 

Primary Keys Composite Keys Candidate Keys Foreign Keys (*) Correct

(1/1) Points 10. Which of the following statements does not apply to relational databases? Relational databases are simple to understand. Tables are one of the basic components of relational databases. Relational databases have a strong procedural orientation. (*) Relational databases relate tables to each other using common elds called keys. Incorrect. Refer to Section 2 Lesson 1.

11. Which symbol is used to show that a particular attribute is optional? & o (*) * #

Incorrect. Refer to Section 2 Lesson 3.

(0/1) Points 12. Which of the attributes is a volatile attribute? Date of birth Eye color Age (*) Race Correct

(1/1) Points 13. To identify an attribute as part of a unique identier on an ER diagram, the # symbol goes in front of it. True or False? True (*)

 

False Correct

(1/1) Points 14. All entities must be given a new articial UID. True or False? True False (*)

Incorrect. Refer to Section 2 Lesson 4.

(0/1) Points 15. Primary keys can contain null values. True False (*) Correct

(1/1) Points Previous 1. A relational database stores information in tables with rows and columns. True (*) False Correct

(1/1) Points 2. A _______ is a collection of records. table (*) eld row column Correct

(1/1) Points 3. Attributes that can be divided into smaller subparts are called________________. Volatile Attribute Single Attribute Composite Attribute (*) Mandatory Attribute

 

Correct

(1/1) Points 4. When creating entities in a logical model you must follow these rules: (Choose Two) (Choose all correct answers)

Exclude Attributes Name them in Plural Include Attributes (*) Name them in Singular (*) Incorrect. Refer to Section 2 Lesson 3. (0/1) Points 5. Which of the following statements about attributes are true? (Choose Two) (Choose all correct answers)

They must be single valued unless they belong to more than one entity. They describe, qualify, quantify, classify, or specify an entity. (*) They are often adjectives. (*) They are the primary container for data. Correct

(1/1) Points 6. Matrix Diagrams are used u sed to verify that all ____________ have been identied for an ERD. attributes keys entities relationships (*) Correct

(1/1) Points modeling. NOT an 7. Capturing all required data is the only goal of entity relationship modeling. example of cardinality?

How many jobs can one employee hold? How many types of jobs are there? (*) How many employees can hold one specic job?

 

All are examples of cardinality. Incorrect. Refer to Section 2 Lesson 5. (0/1) Points 8. One-to-Many relationships have cardinality of one or more in both directions. True or False? True False (*)

Incorrect. Refer to Section 2 Lesson 5.

(0/1) Points 9. People are not born with “numbers”, but a lot of systems assign student numbers, customer IDs, etc. A shoe has a color, a size, a style, but may not have a descriptive “number". So, to be able to uniquely and eciently identify one instance of the entity SHOE, a/an _____________ _______________ UID can be created. Unrealistic Articial (*) Structured Identication Incorrect. Refer to Section 2 Lesson 4. (0/1) Points 10. A Unique Identier has a NULL value for each instance of the entity for the lifetime of the instance. True or False True False (*)  Refer to Section 2 Lesson 4. Incorrect. (0/1) Points Previous 11. ERDish is a language used to create database structures in SQL True False (*)

Incorrect. Refer to Section 2 Lesson 5.

(0/1) Points

 

12. When mapping a relationship for an ERD diagram both sides of the relationship have to be mapped. True (*) False Correct

(1/1) Points 13. The __________ model includes entities, attributes, UIDs, relationships as well as optionality and cardinality of these items. Conceptual Physical Hierarchical Logical (*) Incorrect. Refer to Section 2 Lesson 6. (0/1) Points 14. A logical model includes : Only Entities, Attributes and Unique Identiers Only Entities and Relationships Entities, Attributes, Unique Identiers and Relationships (*) Only Entities, Attributes and Relationships Incorrect. Refer to Section 2 Lesson 2. (0/1) Points 15. In a relational database system, the next step after creating a conceptual data model is to convert it to a _________ . Logical data model (*) Internal data model An entity-relation data model External data model Correct

(1/1) Points Previous 1. Which of the following is NOT a relationship type?

 

Some to None (*) Many to Many One to One One to Many Correct

(1/1) Points 2. A relationship can be between ____________. two entities an entity and itself  multiple entities All of the above. (*) Correct

(1/1) Points 3. The optionality of a relationship must be either _______ or _______. Mandatory or Optional (*) Bidirectional or a single direction Single or Multiple One or (One or More) Incorrect. Refer to Section 2 Lesson 5. (0/1) Points 4. Which of the following is not a goal of ER modeling: Capture all required information. It is acceptable to include information that is derivable. (*) Ensure information appears only once. Locate information in a logical manner Correct

(1/1) Points 5. Capturing all required data is the only goal of entity relationship modeling. True False (*) Correct

 

6. In an ERD diagram how is an optional relationship represented ? With a crows foot With an arrow With a solid line With a dotted line (*) Incorrect. Refer to Section 2 Lesson 6. (0/1) Points 7. An ERD is an example of a ______ Model. Network Conceptual (*) Data Integrity Physical Correct

(1/1) Points 8. In a relational database system, the next step after creating a conceptual data model is to convert it to a _________ . Logical data model (*) External data model Internal data model An entity-relation data model Correct

(1/1) Points 9. In the relational model, data is organized in a basic storage structure called a  ____________..  ____________ Field Row Tuples Table (*) Incorrect. Refer to Section 2 Lesson 1. (0/1) Points

 

10. Which of the following is not an advantage of a relational database? One table with all the data. (*) Eciency Less Redundancy Data Integrity Correct

11. Attributes that can be divided into smaller subparts are called________________. Single Attribute Mandatory Attribute Volatile Attribute Composite Attribute (*) Correct

(1/1) Points 12. Attributes have Instances. True or False? True False (*)

Incorrect. Refer to Section 2 Lesson 3.

(0/1) Points 13. Which of the following statements about attributes are true? (Choose Two) (Choose all correct answers)

They describe, qualify, quantify, classify, or specify an entity. (*) They are the primary container for data. They must be single valued unless they belong to more than one entity. They are often adjectives. (*) Correct

(1/1) Points 14. What is the purpose of a Unique Identier? Create an entity that is unlike any other entity aside from itself. To identify one unique instance of an entity by using one or more attributes and/or relationships. (*)

 

To uniquely determine a table and columns within that table. To identify a specic row within a table, using one or more columns and/or foreign keys.

Incorrect. Refer to Section 2 Lesson 4.

(0/1) Points 15. A unique identier made up of more than one attribute is called a __________. Foreign UID Composite UID (*) Unique UID Candidate UID Correct

 Many reasons exist for creating a conceptual model. Choose three appropriate reasons from the options below. Mark for Review (1) Points   (Choose all correct answers) They capture current and future needs. (*)   They model the information flow of data.   They accurately describe what a physical model will contain. (*)   They model functional and informational needs. (*)   They capture the implementation details of the physical model.

1. The logical model's entities, attributes, unique identiers and relationships map to the physical model's _________________. _________________. Tables, columns, primary keys and foreign keys (*) Files, records, elds and data values Optionality and Cardinality Correct

(1/1) Points 2. Many reasons exist for creating a conceptual model. Choose three appropriate reasons from the options below. (Choose all correct answers)

They capture current and future needs. (*) They capture the data values. They accurately describe what a physical model will contain. (*)

 

They model functional and informational needs. (*) They capture the implementation details of the physical model. Correct

(1/1) Points 3. Which of theanswers) following are suitable Entity names? (Choose Two) (Choose all correct ANIMALS DOG (*) ANIMAL (*) DOGS Correct

(1/1) Points 4. Which of the following statements about attributes are true? (Choose Two) (Choose all correct answers)

They are often adjectives. (*) They must be single valued unless they belong to more than one entity. They describe, qualify, quantify, classify, or specify an entity. (*) They are the primary container for data. Correct

(1/1) Points 5. Entities are usually _____________. Nouns (*) Adverbs Adjectives Verbs Correct

(1/1) Points

6. A candidate UID that does not get chosen to become the primary UID is called a  _________ . Secondary UID (*) Primary UID

 

Composite UID Unique UID Correct

(1/1) Points 7. Primary UIDs are: Optional in data modeling. Mandatory in data modeling (*) Always comprised of numbers Useful as an alternative means of identifying instances of an entity, independent of their datatype Incorrect. Refer to Section 2 Lesson 4. (0/1) Points 8. In the relational model, data is organized in a basic storage structure called a  ____________.  ____________. Row Field Tuples Table (*) Incorrect. Refer to Section 2 Lesson 1. (0/1) Points 9. Data Integrity ensures ______ in the information. errors duplication anomalies no duplication (*) Correct

(1/1) Points 10. Matrix Diagrams are used to verify that all ____________ have been identied for an ERD. entities relationships (*)

 

keys attributes Correct

(1/1) Points Previous 11. If a relationship is mandatory there must be at least one instance of the corresponding entity related to it. True (*) False Correct

(1/1) Points 12. In an ERD, optionality is depicted using __________. names of relationships soft boxes solid or dashed lines (*) single toe or crows foot Correct

(1/1) Points 13. Using ERDish, which wording represents cardinality? (Choose Two) (Choose all correct answers)

one or more (*) one only one or multiple one and only one (*) Incorrect. Refer to Section 2 Lesson 6. (0/1) Points 14. Which of the following is not a goal of ER modeling: It is acceptable to include information that is derivable. (*) Locate information in a logical manner Capture all required information. Ensure information appears only once.

 

Correct

(1/1) Points 15. Which of the following statements about entity relationship diagrams (ERD) is true? Used to communicate the logical structure of the database to users. (*) Is a hard and fast document that cannot be changed once development of the database has begun. Used to communicate the physical structure of the database to users. Used to communicate the technical specications of the database to users Correct

(1/1) Points Previous