Which of the following type of key applied on referential integrity
Correct answer: B. Foreign key
- A. Primary key
- B. Foreign key
- C. Secondary key
- D. Candidate key
Explanation
Referential integrity is a concept in relational databases that ensures the consistency and accuracy of data between linked tables. A foreign key is a column (or set of columns) in one table that references the primary key (or unique key) of another table. It creates a link between the two tables, ensuring that the data in the child table (the table with the foreign key) corresponds to valid data in the parent table (the table with the primary or unique key). This helps to prevent orphaned records, which are records in the child table that reference non-existent records in the parent table.
Last updated
About Databases
Databases cover tables, records, fields, keys and relationships, together with database management systems and relational database design. The subject includes primary and foreign keys, normalization, SQL commands such as SELECT, INSERT, UPDATE and DELETE, queries, forms and reports, while distinguishing a database from a spreadsheet used for simple tabular data.
Practise Databases
210 free Databases MCQs from Computer Science and IT, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Computer Science and IT questions like this
Computer Science and IT is on 40 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
A category of data or information that describes an entity is called
A collection of data that include name, address, phone number etc, of a person:
A collection of raw facts and figures is called:
A constraint between two attributes is called a(n)
A database containing all student in a class would store Roll no of student in: