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A key that is chosen by the database designer as the principal means of identifying entities within an entity set is called a;
- a)Primary keyCorrect Answer
- b)Foreign key
- c)Candidate key
- d)super key
Correct answer is option 'A'. Can you explain this answer?
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A key that is chosen by the database designer as the principal means o...
An attribute or set of attributes which can be used to distinguish every tuple in a table is called a super key.A super key for which no proper subset is a super key is called candidate key.There can be many candidate keys for a table and the candidate key selected by the database designer to identify the tuples uniquely is called a primary key.
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A key that is chosen by the database designer as the principal means o...
Primary Key
Primary key is a key that is chosen by the database designer as the principal means of identifying entities within an entity set. It uniquely identifies each record in a database table. Here is an explanation of why the correct answer is option 'A':
In the context of the question, the primary key is the most appropriate choice as it uniquely identifies entities in an entity set. It plays a crucial role in database design and helps in efficient data retrieval and management.
Primary key is a key that is chosen by the database designer as the principal means of identifying entities within an entity set. It uniquely identifies each record in a database table. Here is an explanation of why the correct answer is option 'A':
- Uniqueness: The primary key must contain unique values for each row in the table. This ensures that each record can be uniquely identified.
- Non-null: The primary key must have a value for each record. It cannot have NULL values to maintain its uniqueness.
- Clustered Index: In many database systems, the primary key is automatically indexed, which helps in faster retrieval of data.
- Relationships: Primary keys are used to establish relationships between different tables in a database through foreign keys.
- Constraints: Primary keys can be used to enforce data integrity constraints such as uniqueness and referential integrity.
In the context of the question, the primary key is the most appropriate choice as it uniquely identifies entities in an entity set. It plays a crucial role in database design and helps in efficient data retrieval and management.
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A key that is chosen by the database designer as the principal means of identifying entities within an entity set is called a;a)Primary keyCorrect Answerb)Foreign keyc)Candidate keyd)super keyCorrect answer is option 'A'. Can you explain this answer?
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