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WorksheetsDatabase_Chap2
Total questions: 41
Worksheet time: 21mins
1) 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
2) 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
3) A fact is an association between two or more:
A) words
B) terms
C) facts
D) nuggets
4) 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.
5) The most common types of entities are:
A) strong entities
B) weak entities
C) associative entities
D) smush entities
6) In an E-R diagram, there are/is _____ business rule(s) for every relationship.
A) two
B) three
C) one
D) zero
7) Business policies and rules govern all of the following EXCEPT:
A) managing employees
B) creating data
C) updating data
D) removing data
8) A _____ defines or constrains some aspect of the business.
A) business constraint
B) business structure
C) business control
D) business rule
9) Which of the following is NOT a characteristic of a good business rule?
A) Declarative
B) Atomic
C) Inconsistent
D) Expressible
10) 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
11) Customers, cars, and parts are examples of:
A) entities
B) attributes
C) cardinals
D) relationships
12) Which of the following is an entity that exists independently of other entity types?
A) Codependent
B) Weak
C) Strong
D) Variant
13) An entity type whose existence depends on another entity type is called a _____ entity.
A) strong
B) weak
C) codependent
D) variant
14) 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.
15) 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
16) 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
17) 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.
18) 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
19) A person's name, birthday, and social security number are all examples of:
A) attributes.
B) entities.
C) relationships.
D) descriptors.
20) An attribute of an entity that is computed is a(n):
A) optional attribute
B) composite attribute
C) derived attribute
D) fuzzy attribute
21) An attribute that can be broken down into smaller parts is called a(n)
_____ attribute.
A) associative
B) simple
C) composite
D) complex
22) The number of entity types that participate in a Unary relationship is:
A) zero
B) one
C) two
D) three
23) The number of entity types that participate in a relationship is called the:
A) number
B) identifying characteristic
C) degree
D) counter
24) A relationship between the instances of a single entity type is called a _____
relationship
A) ternary
B) primary
C) binary
D) unary
25) In the following diagram, what type of relationship is depicted?
A) Unary
B) Binary
C) Ternary
D) Quad
26) 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
27) A simultaneous relationship among the instances of three entity types is called a _____ relationship
A) ternary
B) tertiary
C) primary
D) binar
28) The following figure shows an example of:
A) a composite attribute.
B) a relational attribute.
C) a derived attribute.
D) a multivalued attribute
29) In the figure below, which attribute is multivalued?
A) Years_Employed
B) Employee_ID
C) Skill
D) Address
30) In the figure below, which attribute is derived?
A) Years_Employed
B) Employee_ID
C) Skill
D) Address
31) An attribute that can be calculated from related attribute values is called a _____ attribute
A) simple
B) composite
C) multivalued
D) derived
32) The total quiz points for a student for an entire semester is a(n) _____ attribute.
A) derived
B) mixed
C) stored
D) addressed
33) 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.
34) 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.
35) 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
36) 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
37) 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
38) 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.
39) 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.
40) 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.
41) 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
