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Which of the following is NOT a superkey in a relational schema with attributes V, W, X, Y, Z and primary key V Y ?
- a)V X Y Z
- b)V W X Z
- c)V W X Y
- d)V W X Y Z
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
Which of the following is NOT a superkey in a relational schema with a...
Super key = Candidate Key + other attributes. But option B does not include Y which is a part of PK or candidate key.
Most Upvoted Answer
Which of the following is NOT a superkey in a relational schema with a...
Super key; set of attributes which can identify each row..
so condition for attributes to be super key is uniqueness.
now combination of v y is primary key
so for list of attributes to be super key they should have v and y ..
option b fails so b is answer
so condition for attributes to be super key is uniqueness.
now combination of v y is primary key
so for list of attributes to be super key they should have v and y ..
option b fails so b is answer
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Which of the following is NOT a superkey in a relational schema with a...
Relational Schema:
The given relational schema has the following attributes: V, W, X, Y, and Z. The primary key for this schema is VY.
Superkeys:
A superkey is a set of one or more attributes that can uniquely identify each tuple in a relation. In other words, a superkey is a combination of attributes that guarantees the uniqueness of each tuple.
Analysis:
Let's analyze each option to determine if it is a superkey or not.
a) VXYZ: This option includes all attributes of the relational schema. Since it contains all the attributes, it can uniquely identify each tuple, making it a superkey.
b) VWXZ: This option includes attributes V, W, X, and Z. However, it does not include attribute Y, which is part of the primary key. Therefore, it cannot guarantee the uniqueness of each tuple and is not a superkey.
c) VWXY: This option includes all attributes of the relational schema. Since it contains all the attributes, it can uniquely identify each tuple, making it a superkey.
d) VWXYZ: This option includes all attributes of the relational schema. Since it contains all the attributes, it can uniquely identify each tuple, making it a superkey.
Conclusion:
The option that is NOT a superkey is b) VWXZ. It does not include attribute Y, which is part of the primary key.
The given relational schema has the following attributes: V, W, X, Y, and Z. The primary key for this schema is VY.
Superkeys:
A superkey is a set of one or more attributes that can uniquely identify each tuple in a relation. In other words, a superkey is a combination of attributes that guarantees the uniqueness of each tuple.
Analysis:
Let's analyze each option to determine if it is a superkey or not.
a) VXYZ: This option includes all attributes of the relational schema. Since it contains all the attributes, it can uniquely identify each tuple, making it a superkey.
b) VWXZ: This option includes attributes V, W, X, and Z. However, it does not include attribute Y, which is part of the primary key. Therefore, it cannot guarantee the uniqueness of each tuple and is not a superkey.
c) VWXY: This option includes all attributes of the relational schema. Since it contains all the attributes, it can uniquely identify each tuple, making it a superkey.
d) VWXYZ: This option includes all attributes of the relational schema. Since it contains all the attributes, it can uniquely identify each tuple, making it a superkey.
Conclusion:
The option that is NOT a superkey is b) VWXZ. It does not include attribute Y, which is part of the primary key.
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Which of the following is NOT a superkey in a relational schema with attributes V, W, X, Y, Z and primary key V Y ?a)V X Y Zb)V W X Zc)V W X Yd)V W X Y ZCorrect answer is option 'B'. Can you explain this answer?
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