______________ is a set of one or more attributes taken collectively to uniquely identify a record.a)Primary Keyb)Foreign keyc)Super keyd)Candidate keyCorrect answer is option 'C'. Can you explain this answer?

Question

Answer

The idea of all give of of form all give up uni and all phenomenon is both and some of thing to give some of ans is c

Answer

Foreign key creates a relationship between two relations. Super key is the superset of all the keys in a relation. A candidate key is used to identify tuples in a relation.

Answer

Super key:
A super key is a set of one or more attributes that can uniquely identify a record in a database table. It is a superset of a candidate key and may contain extra attributes. In other words, a super key is a combination of attributes that guarantees uniqueness in a table.

Candidate key:
A candidate key is a minimal super key, meaning it is a subset of a super key that can uniquely identify a record in a table. It does not contain any unnecessary attributes. There can be multiple candidate keys in a table, and one of them is chosen as the primary key.

Primary key:
A primary key is a candidate key chosen as the main identifier of a record in a table. It uniquely identifies each record in the table and has the following characteristics:
- It must contain unique values.
- It cannot have null values.
- There can be only one primary key per table.

Foreign key:
A foreign key is an attribute or a set of attributes in a table that refers to the primary key of another table. It establishes a relationship between two tables and ensures referential integrity. Foreign keys are used to maintain data integrity and enforce relationships between tables.

Explanation:
In the given question, the set of attributes that is being referred to is a super key. It is a combination of one or more attributes that can uniquely identify a record in a table. However, it may contain extra attributes that are not necessary for uniqueness. Therefore, the correct answer is option 'C' - super key.

A primary key is a candidate key chosen as the main identifier, and a foreign key is an attribute that refers to the primary key of another table. While these concepts are related to the concept of a super key, they are not the exact definition being described in the question.

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