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A tuple is a _____________ entity whereas attribute values can be _____________ in the table.
  • a)
    duplicate, multiple
  • b)
    multiple, single
  • c)
    duplicate, unique
  • d)
    unique, duplicate
Correct answer is option 'D'. Can you explain this answer?
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A tuple is a _____________ entity whereas attribute values can be ____...
Concept:
A tuple is a unique entity whereas attribute values can be duplicated in the table.
  • Each row of data in a relation (table) is called a tuple. In a table with n columns, a tuple is a relationship between the n-related values.
  • Tables are referred to as relations in a relational model and are used to store data for various columns. Each table may contain a number of columns, each of which should have a distinct name.
  • It is important to note here that relations in a database are not independent tables, but are associated with each other.
  • Each tuple (row) in a relation (table) corresponds to data of a real-world entity (for example, student, guardian, and attendance).
  • Characteristic or parameters for which data are to be stored in a relation. As stated, the columns of a relation are the attributes also referred to as fields.
  • A sequence of tuples in a relation is immaterial. The tuples are not considered to be ordered, even though they appear to be in tabular form.
  • The tuples within a relation must be distinct. It means no two tuples in a table should have the same value for all attributes.
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A tuple is a _____________ entity whereas attribute values can be ____...
A tuple is a unique entity, whereas attribute values can be duplicate in a table.

Explanation:
A tuple is an individual row or record in a relational database table. It represents a single instance of an entity or object being modeled. For example, in a table representing students, each row or tuple represents a specific student with unique attributes such as student ID, name, age, etc. Tuples are unique and distinct entities within a table. They cannot be duplicated or repeated.

On the other hand, attribute values are the data values that define the characteristics or properties of an entity. For instance, in the student table, the student ID, name, and age are attributes. Attribute values can be duplicated in a table, meaning that multiple tuples can have the same attribute value. For example, two students can have the same age or the same name. However, each student is still represented by a unique tuple.

To summarize:
- A tuple is a unique entity that represents a single instance of an object or entity being modeled.
- Tuples cannot be duplicated or repeated within a table.
- Attribute values are the data values that define the characteristics or properties of an entity.
- Attribute values can be duplicated in a table, meaning multiple tuples can have the same attribute value.

In the given options, option 'D' (unique, duplicate) is the correct answer because it correctly describes the nature of tuples and attribute values in a table.
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A tuple is a _____________ entity whereas attribute values can be _____________ in the table.a)duplicate, multipleb)multiple, singlec)duplicate, uniqued)unique, duplicateCorrect answer is option 'D'. Can you explain this answer?
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