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What is a foreign key?
- a)A foreign key is a primary key of a relation which is an attribute in another relation
- b)A foreign key is a superkey of a relation which is an attribute in more than one other relations
- c)A foreign key is an attribute of a relation that is a primary key of another relation
- d)A foreign key is the primary key of a relation that does not occur anywhere else in the schema
Correct answer is option 'C'. Can you explain this answer?
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What is a foreign key?a)A foreign key is a primary key of a relation w...
What is a Foreign Key?
A foreign key is a crucial concept in relational database management systems that establishes a link between two tables. It plays a significant role in maintaining the integrity of data across different tables.
Definition of a Foreign Key
- A foreign key is an attribute (or a set of attributes) in one table that refers to the primary key of another table.
- This relationship creates a dependency between the two tables, allowing for organized data management.
Key Characteristics
- Reference: The foreign key in one table points to the primary key in another table, establishing a relationship between the two.
- Data Integrity: By enforcing this relationship, foreign keys help maintain referential integrity. This means that records in the referencing table (child table) must correspond to valid records in the referenced table (parent table).
- Examples: For example, in a database of students and courses, a 'Course_ID' in the 'Enrollments' table could serve as a foreign key, linking to the 'Course_ID' primary key in the 'Courses' table.
Why Option C is Correct
- Option C states that "A foreign key is an attribute of a relation that is a primary key of another relation," which accurately describes the relationship foreign keys have with primary keys in different tables.
- This definition aligns perfectly with the purpose and function of foreign keys, making it the correct answer.
Conclusion
Understanding foreign keys is essential for designing relational databases that ensure data integrity and logical relationships between different entities.
A foreign key is a crucial concept in relational database management systems that establishes a link between two tables. It plays a significant role in maintaining the integrity of data across different tables.
Definition of a Foreign Key
- A foreign key is an attribute (or a set of attributes) in one table that refers to the primary key of another table.
- This relationship creates a dependency between the two tables, allowing for organized data management.
Key Characteristics
- Reference: The foreign key in one table points to the primary key in another table, establishing a relationship between the two.
- Data Integrity: By enforcing this relationship, foreign keys help maintain referential integrity. This means that records in the referencing table (child table) must correspond to valid records in the referenced table (parent table).
- Examples: For example, in a database of students and courses, a 'Course_ID' in the 'Enrollments' table could serve as a foreign key, linking to the 'Course_ID' primary key in the 'Courses' table.
Why Option C is Correct
- Option C states that "A foreign key is an attribute of a relation that is a primary key of another relation," which accurately describes the relationship foreign keys have with primary keys in different tables.
- This definition aligns perfectly with the purpose and function of foreign keys, making it the correct answer.
Conclusion
Understanding foreign keys is essential for designing relational databases that ensure data integrity and logical relationships between different entities.
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What is a foreign key?a)A foreign key is a primary key of a relation w...
A foreign key is an attribute of a relation that is initially a primary key of another relation. A foreign key usage preserves referential integrity.
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What is a foreign key?a)A foreign key is a primary key of a relation which is an attribute in another relationb)A foreign key is a superkey of a relation which is an attribute in more than one other relationsc)A foreign key is an attribute of a relation that is a primary key of another relationd)A foreign key is the primary key of a relation that does not occur anywhere else in the schemaCorrect answer is option 'C'. Can you explain this answer?
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What is a foreign key?a)A foreign key is a primary key of a relation which is an attribute in another relationb)A foreign key is a superkey of a relation which is an attribute in more than one other relationsc)A foreign key is an attribute of a relation that is a primary key of another relationd)A foreign key is the primary key of a relation that does not occur anywhere else in the schemaCorrect answer is option 'C'. Can you explain this answer? for Computer Science Engineering (CSE) 2024 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about What is a foreign key?a)A foreign key is a primary key of a relation which is an attribute in another relationb)A foreign key is a superkey of a relation which is an attribute in more than one other relationsc)A foreign key is an attribute of a relation that is a primary key of another relationd)A foreign key is the primary key of a relation that does not occur anywhere else in the schemaCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What is a foreign key?a)A foreign key is a primary key of a relation which is an attribute in another relationb)A foreign key is a superkey of a relation which is an attribute in more than one other relationsc)A foreign key is an attribute of a relation that is a primary key of another relationd)A foreign key is the primary key of a relation that does not occur anywhere else in the schemaCorrect answer is option 'C'. Can you explain this answer?.
What is a foreign key?a)A foreign key is a primary key of a relation which is an attribute in another relationb)A foreign key is a superkey of a relation which is an attribute in more than one other relationsc)A foreign key is an attribute of a relation that is a primary key of another relationd)A foreign key is the primary key of a relation that does not occur anywhere else in the schemaCorrect answer is option 'C'. Can you explain this answer? for Computer Science Engineering (CSE) 2024 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about What is a foreign key?a)A foreign key is a primary key of a relation which is an attribute in another relationb)A foreign key is a superkey of a relation which is an attribute in more than one other relationsc)A foreign key is an attribute of a relation that is a primary key of another relationd)A foreign key is the primary key of a relation that does not occur anywhere else in the schemaCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What is a foreign key?a)A foreign key is a primary key of a relation which is an attribute in another relationb)A foreign key is a superkey of a relation which is an attribute in more than one other relationsc)A foreign key is an attribute of a relation that is a primary key of another relationd)A foreign key is the primary key of a relation that does not occur anywhere else in the schemaCorrect answer is option 'C'. Can you explain this answer?.
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