DATA ANALYTICS UTT - CHAPTER 2

A person's name, birthday, and social security number are all examples of: A) attributes. B) entities. C) relationships. D) descriptors.

A) attributes.

Data modeling may be the most important part of the systems development process because: A) data characteristics are important in the design of programs and other systems components. B) the data in a system are generally less complex than processes and play a central role in development. C) data are less stable than processes. D) it is the easiest.

A) data characteristics are important in the design of programs and other systems components.

The total quiz points for a student for an entire semester is a(n) ________ attribute. A) derived B) mixed C) stored D) addressed

A) derived

Customers, cars, and parts are examples of: A) entities. B) attributes. C) cardinals. D) relationships.

A) entities.

Business policies and rules govern all of the following EXCEPT: A) managing employees. B) creating data. C) updating data. D) removing data.

A) managing employees.

In an E-R diagram, there are/is ________ business rule(s) for every relationship. A) two B) three C) one D) zero

A) two

A fact is an association between two or more: A) words. B) terms. C) facts. D) nuggets.

B) terms.

A value that indicates the date or time of a data value is called a: A) value stamp. B) time stamp. C) checkpoint. D) check counter.

B) time stamp.

An entity type whose existence depends on another entity type is called a ________ entity. A) strong B) weak C) codependent D) variant

B) weak

Which of the following is NOT a good characteristic of a data name? A) Relates to business characteristics B) Readable C) Repeatable D) Relates to a technical characteristic of the system

D) Relates to a technical characteristic of the system

T/F: Some examples of attributes are: eye_color, weight, student_id, STUDENT.

FALSE

T/F: A business rule is a statement that defines or constrains some aspect of the business.

TRUE

T/F: A business rule should be internally consistent.

TRUE

T/F: A fact is an association between two or more terms.

TRUE

T/F: A single occurrence of an entity type is called an entity instance.

TRUE

T/F: An attribute whose values can be calculated from related attribute values is called a derived attribute.

TRUE

T/F: Participation in a relationship may be optional or mandatory.

TRUE

T/F: The relationship between a weak entity type and its owner is an identifying relationship.

TRUE

T/F: The relationship between the instances of two entity types is called a binary relationship.

TRUE

T/F: When choosing an identifier, choose one that will not change its value often.

TRUE

T/F: While business rules are not redundant, a business rule can refer to another business rule.

TRUE

The most common types of entities are: A) strong entities. B) weak entities. C) associative entities. D) smush entities.

A) strong entities.

A simultaneous relationship among the instances of three entity types is called a ________ relationship. A) ternary B) tertiary C) primary D) binary

A) ternary

The number of entity types that participate in a relationship is called the: A) number. B) identifying characteristic. C) degree. D) counter.

C) degree.

An attribute of an entity that is computed is a(n): A) optional attribute. B) composite attribute. C) derived attribute. D) fuzzy attribute.

C) derived attribute.

A ________ defines or constrains some aspect of the business. A) business constraint B) business structure C) business control D) business rule

D) business rule

An attribute that can be calculated from related attribute values is called a ________ attribute. A) simple B) composite C) multivalued D) derived

D) derived

A relationship where the minimum and maximum cardinality are both one is a(n) ________ relationship. A) optional B) unidirectional C) mandatory link D) mandatory one

D) mandatory one

A relationship between the instances of a single entity type is called a ________ relationship. A) ternary B) primary C) binary D) unary

D) unary

A good data definition will describe all of the characteristics of a data object EXCEPT: A) subtleties. B) examples. C) who determines the value of the data. D) who can delete the data.

D) who can delete the data.

T/F: A simple attribute can be broken down into smaller pieces.

FALSE

T/F: A ternary relationship is equivalent to three binary relationships.

FALSE

T/F: An entity type on which a strong entity is dependent is called a covariant entity.

FALSE

T/F: An example of a term would be the following sentence: "A student registers for a course."

FALSE

T/F: Business rules are formulated from a collection of business ramblings.

FALSE

T/F: Data names do not have to be unique.

FALSE

T/F: In an E-R diagram, strong entities are represented by double-walled rectangles.

FALSE

T/F: It is not permissible to associate attributes with relationships.

FALSE

T/F: Most systems developers believe that data modeling is the least important part of the systems development process.

FALSE

T/F: The degree of a relationship is the number of attributes that are associated with it.

FALSE

T/F: The intent of a business rule is to break down business structure.

FALSE

T/F: The maximum criminality of a relationship is the maximum number of instances of entity B that may be associated with each instance of entity A.

FALSE

T/F: The name used for an entity type should never be the same in other E-R diagrams on which the entity appears.

FALSE

T/F: The purpose of data modeling is to document business rules about processes.

FALSE

T/F: The relationship among the instances of three entity types is called a unary relationship.

FALSE

T/F: A good data definition is always accompanied by diagrams, such as the entity-relationship diagram.

TRUE

T/F: A multivalued attribute may take on more than one value for a particular entity instance.

TRUE

T/F: A time stamp is a time value that is associated with a data value.

TRUE

T/F: An entity is a person, place, object, event, or concept in the user environment about which the organization wishes to maintain data.

TRUE

T/F: An entity type name should always be a singular noun.

TRUE

T/F: Data modeling is about documenting rules and policies of an organization that govern data.

TRUE

T/F: Data names should always relate to business characteristics.

TRUE

T/F: Data, rather than processes, are the most complex aspects of many modern information systems.

TRUE

T/F: Enforcement of business rules can be automated through the use of software that can interpret the rules and enforce them.

TRUE

T/F: In an E-R diagram, an associative entity is represented by a rounded rectangle.

TRUE

T/F: It is desirable that no two attributes across all entity types have the same name.

TRUE

T/F: One of the roles of a database analyst is to identify and understand rules that govern data.

TRUE

T/F: One reason to use an associative entity is if the associative entity has one or more attributes in addition to the identifier.

TRUE

T/F: Relationships represent action being taken using a verb phrase.

TRUE

T/F: The E-R model is used to construct a conceptual model.

TRUE

The logical representation of an organization's data is called a(n): A) database model. B) entity-relationship model. C) relationship systems design. D) database entity diagram.

B) entity-relationship model.

A(n) ________ is the relationship between a weak entity type and its owner. A) member chain B) identifying relationship C) jump path D) chain link

B) identifying relationship

A student can attend five classes, each with a different professor. Each professor has 30 students. The relationship of students to professors is a ________ relationship. A) one-to-one B) many-to-many C) one-to-many D) strong

B) many-to-many

The number of entity types that participate in a Unary relationship is: A) zero. B) one. C) two. D) three.

B) one.

An attribute that must be present for every entity (or relationship) instance is a(n): A) composite attribute. B) required attribute. C) optional attribute. D) multivalued attribute.

B) required attribute.

An entity that associates the instances of one or more entity types and contains attributes peculiar to the relationships is called a(n): A) associative entity. B) build entity. C) gateway entity. D) smush entity.

A) associative entity.

A property or characteristic of an entity type that is of interest to the organization is called a(n): A) attribute. B) coexisting entity. C) relationship. D) cross-function.

A) attribute.

A mutually exclusive relationship is one in which: A) an entity instance can participate in many different relationships. B) an entity instance can participate in only one of several alternative relationships. C) an entity instance cannot participate in a relationship with another entity instance. D) an entity instance bridges other XML documents.

B) an entity instance can participate in only one of several alternative relationships.

A ________ specifies the number of instances of one entity that can be associated with each instance of another entity. A) degree B) cardinality constraint C) counter constraint D) limit

B) cardinality constraint

An attribute that uniquely identifies an entity and consists of a composite attribute is called a(n): A) composite attribute. B) composite identifier. C) identifying attribute. D) relationship identifier.

B) composite identifier.

Which of the following criteria should be considered when selecting an identifier? A) Choose an identifier that is not stable. B) Choose a null identifier. C) Choose an identifier that doesn't have large composite attributes. D) Choose the most complex identifier possible.

C) Choose an identifier that doesn't have large composite attributes.

Which of the following is NOT a characteristic of a good business rule? A) Declarative B) Atomic C) Inconsistent D) Expressible

C) Inconsistent

Which of the following is an entity that exists independently of other entity types? A) Codependent B) Weak C) Strong D) Variant

C) Strong

An entity type name should be all of the following EXCEPT: A) concise. B) specific to the organization. C) as short as possible. D) a singular noun.

C) as short as possible.

An attribute that can be broken down into smaller parts is called a(n) ________ attribute. A) associative B) simple C) composite D) complex

C) composite

T/F: A business rule is a statement of how a policy is enforced or conducted.

FALSE

T/F: A cardinality constraint tells what kinds of properties are associated with an entity.

FALSE

T/F: A customer can order many items, and an item can be ordered by many customers is an example of a recursive relationship.

FALSE

T/F: A relationship instance is an association between entity instances where each relationship instance includes exactly one entity from each participating entity type.

FALSE