Kit102-entity Relationship Diagram
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Kit102-entity relationship diagram is a data concept that business uses to determine and to ensure that they achieve what the market needs at al time to keep the business performing well. Enjoy the quiz and all the best.
- 1.ER was developed by Chen in 1980
- A.
True
- B.
False
- 2.ER was developed by Chen in 1976
- A.
True
- B.
False
- 3.ER aims to
- A.
Facilitate database programming
- B.
Facilitate database organization
- C.
Facilitate database design
- 4.
- A.
Describe the structure of a database and the associated insert and update transactions
- B.
Describe the structure of a database and the associated retrieval and update transactions
- C.
Describe the structure of a database and the associated retrieval transactions
- 5.An ERs purpose is to support a users perception of the data and conceal the technical aspects associated with database design.
- A.
True
- B.
False
- 6.A high level conceptual model is dependent on the DBMS and HW platform used to implement the database
- A.
True
- B.
False
- 7.The basic concepts of Entity-Relationship model include:
- A.
Entity types
- B.
File types
- C.
Relationship types
- D.
Atrtributes
- E.
Storage detailes
- 8.Entity type = An object or concept identified by the enterprise as having an ______________ existance
- 9.A Entity is
- A.
An instance of an Entity type that is uniquely identifiable
- B.
An instance of a DBA type that is uniquely identifiable
- C.
An instance of a type that is uniquely identifiable
- 10.Weak entity type
- A.
An entity that is not existance-dependent on some other entity type
- B.
An Entity that characterizes a DBMS
- C.
An instance that is existance dependent on some other entity type
- 11.Strong entity type
- A.
An entity that is not existance-dependent on some other entity type
- B.
An Entity that characterizes a DBMS
- C.
An instance that is existance dependent on some other entity type
- 12.An Atribute is a property of an entity or a relationship type
- A.
True
- B.
False
- 13.An Atribute
- A.
a set of values that might be asigned to an atribute
- B.
is a property of an entity or a relationship type
- 14.An Atribute domain
- A.
a set of values that might be asigned to an atribute
- B.
is a property of an entity or a relationship type
- 15.Simple atribute
- A.
An attribute that represents a value that is derivable from a related atrribute or set of atributes, not necessarily in the same entity
- B.
An attribute that holds multiple values for a single component
- C.
An attribute that holds a single value for a single entity
- D.
An atribute composed of multiple components each with individual existance
- E.
An atribute composed of a single component with an independent existance
- 16.Composite atribute
- A.
An attribute that represents a value that is derivable from a related atrribute or set of atributes, not necessarily in the same entity
- B.
An attribute that holds multiple values for a single component
- C.
An attribute that holds a single value for a single entity
- D.
An atribute composed of multiple components each with individual existance
- E.
An atribute composed of a single component with an independent existance
- 17.Single valued atribute
- A.
An attribute that represents a value that is derivable from a related atrribute or set of atributes, not necessarily in the same entity
- B.
An attribute that holds multiple values for a single component
- C.
An attribute that holds a single value for a single entity
- D.
An atribute composed of multiple components each with individual existance
- E.
An atribute composed of a single component with an independent existance
- 18.Multi- valued atribute
- A.
An attribute that represents a value that is derivable from a related atrribute or set of atributes, not necessarily in the same entity
- B.
An attribute that holds multiple values for a single component
- C.
An attribute that holds a single value for a single entity
- D.
An atribute composed of multiple components each with individual existance
- E.
An atribute composed of a single component with an independent existance
- 19.Derived atribute
- A.
An attribute that represents a value that is derivable from a related atrribute or set of atributes, not necessarily in the same entity
- B.
An attribute that holds multiple values for a single component
- C.
An attribute that holds a single value for a single entity
- D.
An atribute composed of multiple components each with individual existance
- E.
An atribute composed of a single component with an independent existance
- 20.A Candidate key is an atribute or set of atributes that uniquely identifies individual occurences of an entity type
- A.
True
- B.
False
- 21.The Primary key
- A.
Uniquely identifies each occurance of an entity type
- B.
Is equivalant with a composite key
- C.
Is the candidate key selected to be a primary key
- 22.A Composite key is an candidate key that cosists of two or more atributes
- A.
True
- B.
False
- 23.Degree of a relationship
- A.
Is always 1
- B.
The number of participating entities in a relationship
- C.
The number of representations in a relationship
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