Quiz 2: Modeling Data in the Organization

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.

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.

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

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.

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

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

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

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

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

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

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

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

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

The following figure shows an example of: A) a one-to-many relationship. B) a strong entity and its associated weak entity. C) a co-dependent relationship. D) a double-walled relationship.

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

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.

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.

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.

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

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

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

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

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

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

In the following diagram, what type of relationship is depicted? A) Unary B) Binary C) Ternary D) Quad

In the following diagram, which is true? A) It depicts a ternary relationship. B) It depicts a many-to-many relationship. C) Item represents a column. D) BOM_STRUCTURE represents a row.

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

The following figure shows an example of: A) a composite attribute. B) a relational attribute. C) a derived attribute. D) a multivalued attribute.

In the figure below, which attribute is multivalued? A) Years_Employed B) Employee_ID C) Skill D) Address

In the figure below, which attribute is derived? A) Years_Employed B) Employee_ID C) Skill D) Address

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

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

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.

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.

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 ________ 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

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

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.

In the figure shown below, which of the following is true? A) A person can marry at most one person. B) A person has to be married. C) A person can marry more than one person, but that person can only be married to one person. D) A person can marry more than one person.

For the relationship represented in the figure below, which of the following is true? A) An employee can work in more than one department but does not have to work for any department. B) A department must have at least one employee. C) A department can have more than one employee. D) An employee has to work for more than one department.

In the following diagram, which of the answers below is true? A) Each patient has one or more patient histories. B) Each patient has one and only one visit. C) Each patient history belongs to zero and one patient. D) Each patient history belongs to many patients.

In the figure shown below, which of the following business rules would apply? A) Each vendor can supply many parts to any number of warehouses, but need not supply any parts. B) Each part must be supplied by exactly one vendor to any number of warehouses. C) Each warehouse can be supplied with any number of parts from more than one vendor, and each warehouse could be supplied with no parts. D) VENDOR is not allowed.

In the following diagram, which answer is true? A) Each employee can supervise one employee, no employees, or many employees. B) Each employee can manage many departments. C) Each employee works in more than one department. D) Each employee was fired.

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

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.

The E-R model is used to construct a conceptual model.

A business rule is a statement that defines or constrains some aspect of the business.

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

The intent of a business rule is to break down business structure.

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

A business rule is a statement of how a policy is enforced or conducted.

While business rules are not redundant, a business rule can refer to another business rule.

A business rule should be internally consistent.

Business rules are formulated from a collection of business ramblings.

Data names should always relate to business characteristics.

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

A fact is an association between two or more terms.

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

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

A single occurrence of an entity type is called an entity instance.

In the figure below, Name would be an ideal identifier.

When choosing an identifier, choose one that will not change its value often.

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

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

Data modeling is about documenting rules and policies of an organization that govern data.

The purpose of data modeling is to document business rules about processes.

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

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

Data names do not have to be unique.

The relationship between a weak entity type and its owner is an identifying relationship.

An entity type on which a strong entity is dependent is called a covariant entity.

An entity type name should always be a singular noun.

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

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

A simple attribute can be broken down into smaller pieces.

An attribute whose values can be calculated from related attribute values is called a derived attribute.

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

Relationships represent action being taken using a verb phrase.

Participation in a relationship may be optional or mandatory.

A ternary relationship is equivalent to three binary relationships.

The degree of a relationship is the number of attributes that are associated with it.

The relationship between the instances of two entity types is called a binary relationship.

The relationship among the instances of three entity types is called a unary relationship.

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

It is not permissible to associate attributes with relationships.

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

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

In the figure below, the name of the relationship follows the guidelines for naming a relationship.

A cardinality constraint tells what kinds of properties are associated with an entity.

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.

In the figure shown below, a person has to be married.

For the relationship represented in the figure below, a department can have more than one employee.

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

A time stamp is a time value that is associated with a data value.

On what premises are business rules based?

What is the difference between an entity type and an entity instance?

How is a strong entity different from a weak entity?

What is the difference between a simple attribute and a composite attribute?

What is a derived attribute, and how is it different from a stored attribute?

What are some of the guidelines for good data names of objects in general?

What are the three different degrees of relationship?

What is an associative entity? What four conditions should exist in order to convert a relationship to an associative entity?