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Which of the following statements best describes the concept of normalization in a relational database?- a)Normalization is the process of combining tables to reduce data redundancy.
- b)Normalization is the process of breaking down tables to eliminate data redundancy and anomalies.
- c)Normalization is the process of creating indexes to improve query performance.
- d)Normalization is the process of securing a database by implementing access control.
Correct answer is option 'B'. Can you explain this answer?
a)
Normalization is the process of combining tables to reduce data redundancy.
b)
Normalization is the process of breaking down tables to eliminate data redundancy and anomalies.
c)
Normalization is the process of creating indexes to improve query performance.
d)
Normalization is the process of securing a database by implementing access control.
|
Goel UPSC Coaching Center answered |
Normalization is a systematic approach to organizing and structuring a relational database to eliminate data redundancy and anomalies such as insertion, update, and deletion anomalies. It involves breaking down tables into smaller, related tables to ensure data integrity and consistency. By doing so, we can avoid the issues that arise when data is duplicated across tables, leading to inconsistencies and inefficiencies in data management.
What is the primary purpose of a database management system (DBMS)?- a)To provide a graphical user interface for end users.
- b)To generate reports and perform analytics on data.
- c)To define, manipulate, retrieve, and manage data in a structured manner.
- d)To create backup copies of data on a regular basis.
Correct answer is option 'C'. Can you explain this answer?
a)
To provide a graphical user interface for end users.
b)
To generate reports and perform analytics on data.
c)
To define, manipulate, retrieve, and manage data in a structured manner.
d)
To create backup copies of data on a regular basis.
|
Spectrum Coaching Institute answered |
A database management system (DBMS) is software designed to define, manipulate, retrieve, and manage data in a structured and organized manner. It provides mechanisms for data validation, data storage, data retrieval, and data manipulation. DBMS also enforces data integrity and security, making it an essential tool for effective data management.
In a relational database, what is the purpose of a foreign key?- a)A foreign key ensures data redundancy.
- b)A foreign key is used to access data from remote servers.
- c)A foreign key establishes a link between tables, referencing the primary key of another table.
- d)A foreign key is used to encrypt sensitive data in the database.
Correct answer is option 'C'. Can you explain this answer?
a)
A foreign key ensures data redundancy.
b)
A foreign key is used to access data from remote servers.
c)
A foreign key establishes a link between tables, referencing the primary key of another table.
d)
A foreign key is used to encrypt sensitive data in the database.
|
Ias Masters answered |
A foreign key is a column or set of columns in a table that references the primary key of another table. It establishes a relationship between tables and enables the creation of meaningful associations among different pieces of data. This ensures data integrity and allows for enforcing referential integrity constraints.
Which type of key is used to establish relationships between tables in a relational database?- a)Private key
- b)Foreign key
- c)Secret key
- d)Super key
Correct answer is option 'B'. Can you explain this answer?
a)
Private key
b)
Foreign key
c)
Secret key
d)
Super key
|
Master Training Institute answered |
A foreign key is used to establish relationships between tables in a relational database. It references the primary key of another table and helps maintain data consistency and integrity by enforcing referential integrity constraints.
What is the purpose of creating views in a database?- a)Views are used to store sensitive data securely.
- b)Views help in optimizing query performance.
- c)Views provide a way to define access permissions for users.
- d)Views present a customized and simplified representation of data from multiple tables.
Correct answer is option 'D'. Can you explain this answer?
a)
Views are used to store sensitive data securely.
b)
Views help in optimizing query performance.
c)
Views provide a way to define access permissions for users.
d)
Views present a customized and simplified representation of data from multiple tables.
|
EduRev UPSC answered |
Views in a database provide a way to present a customized and simplified representation of data from multiple tables. They allow users to access specific subsets of data, hide complexity, and provide an additional layer of security by controlling access to sensitive information.
In the context of normalization, what is a primary key?- a)A key used for accessing the database management system.
- b)A unique identifier for a table's records, used to establish relationships.
- c)A key used to encrypt sensitive data in the database.
- d)A key used to authorize user access to the database.
Correct answer is option 'B'. Can you explain this answer?
a)
A key used for accessing the database management system.
b)
A unique identifier for a table's records, used to establish relationships.
c)
A key used to encrypt sensitive data in the database.
d)
A key used to authorize user access to the database.
|
Valor Academy answered |
A primary key is a unique identifier for the records in a table. It ensures that each row within the table is uniquely identifiable. Primary keys are essential for establishing relationships between different tables in a relational database. They play a crucial role in maintaining data integrity and allowing efficient data retrieval operations.
Which level of abstraction describes how a record is physically stored in the database?- a)Physical Level
- b)Logical Level
- c)View Level
- d)Data Level
Correct answer is option 'A'. Can you explain this answer?
a)
Physical Level
b)
Logical Level
c)
View Level
d)
Data Level
|
|
Goel UPSC Coaching Center answered |
The physical level of abstraction describes how a record is physically stored on the storage devices of the database system. It deals with aspects such as storage structure, file organization, and data storage formats.
What is the primary goal of normalizing a database?- a)To maximize data redundancy for better performance.
- b)To create complex queries for reporting purposes.
- c)To eliminate data anomalies and ensure data integrity.
- d)To optimize database storage space.
Correct answer is option 'C'. Can you explain this answer?
a)
To maximize data redundancy for better performance.
b)
To create complex queries for reporting purposes.
c)
To eliminate data anomalies and ensure data integrity.
d)
To optimize database storage space.
|
|
Master Training Institute answered |
The primary goal of normalizing a database is to eliminate data anomalies, including insertion, update, and deletion anomalies. By organizing data into well-structured tables and removing redundancies, normalization ensures data integrity, consistency, and accuracy within the database.
Which normal form requires that a table is in Second Normal Form (2NF) and that all non-key attributes are fully functionally dependent on the primary key?- a)First Normal Form (1NF)
- b)Third Normal Form (3NF)
- c)Boyce-Codd Normal Form (BCNF)
- d)Fourth Normal Form (4NF)
Correct answer is option 'B'. Can you explain this answer?
a)
First Normal Form (1NF)
b)
Third Normal Form (3NF)
c)
Boyce-Codd Normal Form (BCNF)
d)
Fourth Normal Form (4NF)
|
|
Ias Masters answered |
Third Normal Form (3NF) requires that a table meets the criteria of Second Normal Form (2NF) and additionally ensures that all non-key attributes are fully functionally dependent on the primary key. This normalization process eliminates transitive dependencies and helps maintain data consistency.
Which normal form deals with eliminating transitive dependencies between non-key attributes?- a)First Normal Form (1NF)
- b)Second Normal Form (2NF)
- c)Third Normal Form (3NF)
- d)Boyce-Codd Normal Form (BCNF)
Correct answer is option 'D'. Can you explain this answer?
a)
First Normal Form (1NF)
b)
Second Normal Form (2NF)
c)
Third Normal Form (3NF)
d)
Boyce-Codd Normal Form (BCNF)
|
Capstone Ias Learning answered |
Boyce-Codd Normal Form (BCNF) deals with eliminating transitive dependencies between non-key attributes by ensuring that every determinant (a column that determines the values of other columns) is a candidate key. This helps to further reduce data redundancy and anomalies.
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