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A relation (from the relational database model) consists of a set of tuples, which implies that
  • a)
    Relational model supports multi-valued attributes whose values can be represented in sets.
  • b)
    For any two tuples, the values associated with all of their attributes may be the same.
  • c)
    For any two tuples, the value associated with one or more of their attributes must differ.
  • d)
    All tuples in a particular relation may have different attributes.
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
A relation (from the relational database model) consists of a set of t...
Explanation:

Relational database model is based on the concept of relations or tables. A relation consists of a set of tuples, where each tuple represents a single entity or object in the real world. Each tuple has a set of attributes or fields, which represent the properties or characteristics of that entity. The values of these attributes are stored in the corresponding columns of the table.

Let us now understand the given options one by one:

a) Relational model supports multi-valued attributes whose values can be represented in sets.

This statement is incorrect. Relational model does not support multi-valued attributes. Each attribute in a relation can have only a single value. However, we can represent multiple values of an attribute by creating a separate table and establishing a relationship between the two tables.

b) For any two tuples, the values associated with all of their attributes may be the same.

This statement is also incorrect. In a relation, each tuple represents a unique entity, and therefore, the values associated with all of their attributes cannot be the same. There must be at least one attribute whose value differs between the two tuples.

c) For any two tuples, the value associated with one or more of their attributes must differ.

This statement is correct. As explained above, each tuple in a relation represents a unique entity, and therefore, the values associated with all of their attributes cannot be the same. There must be at least one attribute whose value differs between the two tuples.

d) All tuples in a particular relation may have different attributes.

This statement is also incorrect. In a relation, all tuples must have the same set of attributes, although some attributes may have null values in some tuples.

Therefore, the correct answer is option 'C', which states that for any two tuples, the value associated with one or more of their attributes must differ.
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A relation (from the relational database model) consists of a set of t...
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A relation (from the relational database model) consists of a set of tuples, which implies thata)Relational model supports multi-valued attributes whose values can be represented in sets.b)For any two tuples, the values associated with all of their attributes may be the same.c)For any two tuples, the value associated with one or more of their attributes must differ.d)All tuples in a particular relation may have different attributes.Correct answer is option 'C'. Can you explain this answer?
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