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Choose the correct statement regarding superkeys
- a)A superkey is an attribute or a group of multiple attributes that can uniquely identify a tuple
- b)A superkey is a tuple or a set of multiple tuples that can uniquely identify an attribute
- c)Every superkey is a candidate key
- d)A superkey is an attribute or a set of attributes that distinguish the relation from other relations
Correct answer is option 'A'. Can you explain this answer?
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Choose the correct statement regarding superkeysa)A superkey is an att...
A superkey is an attribute or a set of multiple attributes that can uniquely identify a tuple. It is used to differentiate between tuples.
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Choose the correct statement regarding superkeysa)A superkey is an att...
Superkeys in Database Management Systems
Definition of Superkey:
A superkey is an attribute or a group of multiple attributes that can uniquely identify a tuple in a relation or table within a database.
Explanation of the Correct Statement:
The correct statement is option 'A': A superkey is an attribute or a group of multiple attributes that can uniquely identify a tuple.
Understanding Superkeys:
To understand the concept of superkeys, it is important to have a basic understanding of database tables and tuples. In a relational database, a table consists of rows and columns. Each row in a table is known as a tuple, and each tuple has a unique identifier called a key.
A superkey is a set of attributes that can be used to uniquely identify a tuple within a table. It can be a single attribute or a combination of multiple attributes. The key characteristic of a superkey is that it must be able to uniquely identify each tuple in the table.
Example:
Let's consider a table called "Employees" with the following attributes:
- Employee_ID (Primary Key)
- First_Name
- Last_Name
- Email
In this example, the Employee_ID attribute alone can be considered a superkey because it uniquely identifies each employee in the table. Additionally, a combination of attributes like Employee_ID and Email can also be a superkey, as this combination can uniquely identify each employee in the table.
Comparison with Other Statements:
- Option 'B': A superkey is a tuple or a set of multiple tuples that can uniquely identify an attribute. This statement is incorrect because a superkey identifies tuples, not attributes.
- Option 'C': Every superkey is a candidate key. This statement is incorrect because a superkey may or may not be a candidate key. A candidate key is a minimal superkey, meaning it cannot be further reduced without losing the uniqueness property.
- Option 'D': A superkey is an attribute or a set of attributes that distinguish the relation from other relations. This statement is incorrect because a superkey identifies tuples within a relation, not the relation itself.
Conclusion:
In conclusion, a superkey is an attribute or a group of multiple attributes that can uniquely identify a tuple within a relation. It is an important concept in database management systems for ensuring data integrity and efficient data retrieval.
Definition of Superkey:
A superkey is an attribute or a group of multiple attributes that can uniquely identify a tuple in a relation or table within a database.
Explanation of the Correct Statement:
The correct statement is option 'A': A superkey is an attribute or a group of multiple attributes that can uniquely identify a tuple.
Understanding Superkeys:
To understand the concept of superkeys, it is important to have a basic understanding of database tables and tuples. In a relational database, a table consists of rows and columns. Each row in a table is known as a tuple, and each tuple has a unique identifier called a key.
A superkey is a set of attributes that can be used to uniquely identify a tuple within a table. It can be a single attribute or a combination of multiple attributes. The key characteristic of a superkey is that it must be able to uniquely identify each tuple in the table.
Example:
Let's consider a table called "Employees" with the following attributes:
- Employee_ID (Primary Key)
- First_Name
- Last_Name
In this example, the Employee_ID attribute alone can be considered a superkey because it uniquely identifies each employee in the table. Additionally, a combination of attributes like Employee_ID and Email can also be a superkey, as this combination can uniquely identify each employee in the table.
Comparison with Other Statements:
- Option 'B': A superkey is a tuple or a set of multiple tuples that can uniquely identify an attribute. This statement is incorrect because a superkey identifies tuples, not attributes.
- Option 'C': Every superkey is a candidate key. This statement is incorrect because a superkey may or may not be a candidate key. A candidate key is a minimal superkey, meaning it cannot be further reduced without losing the uniqueness property.
- Option 'D': A superkey is an attribute or a set of attributes that distinguish the relation from other relations. This statement is incorrect because a superkey identifies tuples within a relation, not the relation itself.
Conclusion:
In conclusion, a superkey is an attribute or a group of multiple attributes that can uniquely identify a tuple within a relation. It is an important concept in database management systems for ensuring data integrity and efficient data retrieval.
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Choose the correct statement regarding superkeysa)A superkey is an attribute or a group of multiple attributes that can uniquely identify a tupleb)A superkey is a tuple or a set of multiple tuples that can uniquely identify an attributec)Every superkey is a candidate keyd)A superkey is an attribute or a set of attributes that distinguish the relation from other relationsCorrect answer is option 'A'. Can you explain this answer?
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Choose the correct statement regarding superkeysa)A superkey is an attribute or a group of multiple attributes that can uniquely identify a tupleb)A superkey is a tuple or a set of multiple tuples that can uniquely identify an attributec)Every superkey is a candidate keyd)A superkey is an attribute or a set of attributes that distinguish the relation from other relationsCorrect answer is option 'A'. Can you explain this answer? for Computer Science Engineering (CSE) 2024 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about Choose the correct statement regarding superkeysa)A superkey is an attribute or a group of multiple attributes that can uniquely identify a tupleb)A superkey is a tuple or a set of multiple tuples that can uniquely identify an attributec)Every superkey is a candidate keyd)A superkey is an attribute or a set of attributes that distinguish the relation from other relationsCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Choose the correct statement regarding superkeysa)A superkey is an attribute or a group of multiple attributes that can uniquely identify a tupleb)A superkey is a tuple or a set of multiple tuples that can uniquely identify an attributec)Every superkey is a candidate keyd)A superkey is an attribute or a set of attributes that distinguish the relation from other relationsCorrect answer is option 'A'. Can you explain this answer?.
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