
Understanding DBMS Keys and Dependencies
Quiz
•
Computers
•
12th Grade
•
Practice Problem
•
Hard
Sharfuddin Mohammed
Used 1+ times
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What distinguishes a candidate key from a primary key?
A candidate key can be any unique identifier, while a primary key is the selected candidate key used for record identification.
A primary key can be any unique identifier, while a candidate key is the selected primary key.
A candidate key must always be a single attribute, while a primary key can be composite.
A primary key is used for foreign key relationships, while a candidate key is not.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Explain the concept of functional dependency in DBMS.
Functional dependency is a method to store data in multiple tables without any relationships.
Functional dependency means that all attributes are independent of each other.
Functional dependency is a relationship where one attribute's value determines another attribute's value in a database.
Functional dependency refers to the process of normalizing a database by removing all attributes.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do you calculate the attribute closure of a set of attributes?
The attribute closure is the set of all attributes that can be functionally determined by the given set of attributes.
The attribute closure is the set of all attributes in the database.
The attribute closure is determined by the number of attributes in the set.
You can calculate the attribute closure by listing all possible values.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Describe the relationship between functional dependencies and candidate keys.
Functional dependencies are irrelevant to candidate keys.
Candidate keys can exist without any functional dependencies.
Functional dependencies only apply to primary keys, not candidate keys.
Functional dependencies help identify candidate keys by showing which attributes can uniquely determine others.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the difference between a super key and a candidate key?
A super key can have extra attributes, while a candidate key is minimal.
A super key is always a primary key, while a candidate key is not.
A super key is a combination of all attributes in a table, while a candidate key is a single attribute.
A candidate key can have duplicate values, while a super key cannot.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How can you identify candidate keys using functional dependencies?
Candidate keys are always the primary keys of the table.
Candidate keys can be identified by finding minimal attribute sets whose closures include all attributes.
Candidate keys can be found by grouping all attributes together without considering dependencies.
Candidate keys can be identified by selecting any single attribute from the set.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What are the implications of foreign key constraints on data integrity?
Foreign key constraints allow duplicate records in the database.
Foreign key constraints have no effect on data relationships.
Foreign key constraints can be ignored without consequences.
Foreign key constraints enhance data integrity by enforcing referential integrity and preventing orphaned records.
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