Explain how to derive new classes from base classes

Assignment Help Database Management System

Reference no: EM131142503

Part 1:

QUESTION 1
A highly organized collection of data is a database management system.
True
False

QUESTION 2
Financial data residing in a database is not a corporate resource.
True
False

QUESTION 3
Modality is the maximum number of entity occurrences involved in a relationship.
True
False

QUESTION 4
Unary relationships contain one entity type.
True
False

QUESTION 5
In a database, if there is more than one candidate key one MUST be identified as a primary key.
True
False

QUESTION 6
A concurrency problem is defined as multiple data sets stored in the database.
True
False

QUESTION 7
The most significant problem with data redundancy in a database is data integrity.
True
False

QUESTION 8
Data redundancy can result in requiring unnecessary storage space for the database.
True
False

QUESTION 9
Many-many relationships should be converted to associative entities on an Entity-Relationship diagram.
True
False

QUESTION 10
There are two modes of data access known as sequential and direct access.
True
False

QUESTION 11
Data within a database is typically controlled and manipulated by:
A. MY SQL Workbench
B. Database Management Software
C. MS Word
D. MS Excel

QUESTION 12
A unique identifier of an entity is ____
A. Relationship
B. Cardinality
C. Attribute
D. Binary

QUESTION 13
In an M-M relationship, the combination of or the association between two entities is known as ____
A. Cardinality
B. Modality
C. Associative entity
D. Intersection data

QUESTION 14
A ________ relationship associates occurrences of an entity type with other occurrences of the same entity type.
A. Binary
B. Tertiary
C. Unary
D. Secondary

QUESTION 15
How many entity types are involved in a tertiary relationship?
A. 1
B. 2
C. 3
D. 4

QUESTION 16
The means by which an analyst records, documents, and diagrams the business environment is known as ________.
A. Relationship Identification
B. Data Association
C. Data Analysis
D. Data modeling

QUESTION 17
In a DBMS, Referential Integrity contains three rules which are:
A. Restrict
B. Cascade
C. Set-to-null
D. Read
E. All of the above
F. A, B, and C

QUESTION 18
The process of arranging attributes of entities in a given business environment into database structures is known as:
A. Physical Database design
B. Database structuring
C. Logical Database design
D. Relationship mapping

QUESTION 19
Each row of a database is known as a ______
A. File
B. Field
C. Entity
D. Record

QUESTION 20
An entity's attribute in a database management system is referred to as a ________.
A. Record
B. Relationship
C. Field
D. Row

QUESTION 21
A foreign key is defined as _________.
A. The key attribute of an entity
B. An identifier of the relationship
C. Primary key of an entity
D. Primary key of a relation that appears in another relation

QUESTION 22
An attribute or field that uniquely appears in every row of the relation is known as ____.
A. Key field
B. Primary Key
C. Foreign Key
D. Intersection ID

QUESTION 23
Each table column in a database entity is commonly known as a ____________.
A. Record
B. Relationship
C. Field
D. Primary Key

QUESTION 24
The purpose of a database is to _____________.
A. Eliminate redundancy
B. Centralize data
C. Integrate data logically
D. All of the above
E. None of the above

Part 2:

QUESTION 1
Describe what is an array. Provide examples and uses in VB & C# languages.

QUESTION 2
Explain how to derive New Classes from Base Classes. Provide examples and uses in VB & C# languages.

QUESTION 3
Describe classes, including constructors, methods, data, value, and reference types. Provide examples and uses in VB & C# languages.

QUESTION 4
Describe delegate types. Provide examples and uses in VB & C# languages.

Reference no: EM131142503

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