Relational Database Model MCQs in DBMS

MCQs on Relational Database Model in DBMS

Who is credited with the creation of the relational database model?
- A. Edgar F. Codd
- B. Charles Bachman
- C. Larry Ellison
- D. James Gosling
- Answer: A. Edgar F. Codd
In the relational model, data is organized into:
- A. Trees
- B. Graphs
- C. Tables
- D. Arrays
- Answer: C. Tables
What is the primary key in a relational database?
- A. A unique identifier for each row in a table.
- B. A non-unique column.
- C. A key that can have null values.
- D. A foreign key.
- Answer: A. A unique identifier for each row in a table.
In a relational database, what is a foreign key?
- A. A key that uniquely identifies a row.
- B. A key that points to a primary key in another table.
- C. A non-unique identifier.
- D. A key that does not allow null values.
- Answer: B. A key that points to a primary key in another table.
Which language is most commonly used to interact with relational databases?
- A. C++
- B. Python
- C. SQL
- D. Java
- Answer: C. SQL
In the relational model, a row is also known as a:
- A. Column
- B. Tuple
- C. Attribute
- D. Key
- Answer: B. Tuple
In the relational model, a column is also known as a:
- A. Tuple
- B. Relation
- C. Attribute
- D. Domain
- Answer: C. Attribute
What is a relation in the context of the relational database model?
- A. A table with rows and columns.
- B. A function that maps keys to values.
- C. A hierarchy of data.
- D. A network of connected nodes.
- Answer: A. A table with rows and columns.
Which of the following is a characteristic of a relational database table?
- A. Each column has a unique name.
- B. Each row must have a unique key.
- C. Columns can have different data types.
- D. All of the above.
- Answer: D. All of the above.
What is normalization in relational databases?
- A. The process of organizing data to reduce redundancy.
- B. The process of creating primary keys.
- C. The process of writing SQL queries.
- D. The process of creating foreign keys.
- Answer: A. The process of organizing data to reduce redundancy.
Which normal form eliminates all duplicate columns from the table?
- A. First Normal Form (1NF)
- B. Second Normal Form (2NF)
- C. Third Normal Form (3NF)
- D. Boyce-Codd Normal Form (BCNF)
- Answer: A. First Normal Form (1NF)
In relational database terminology, a domain is:
- A. A set of allowed values for an attribute.
- B. A unique identifier for a table.
- C. A constraint that specifies the data type.
- D. A key used to establish relationships.
- Answer: A. A set of allowed values for an attribute.
Which of the following constraints ensures that no two rows have the same value for a particular column?
- A. Primary Key
- B. Unique Key
- C. Foreign Key
- D. Not Null
- Answer: B. Unique Key
Which SQL keyword is used to retrieve data from a database?
- A. SELECT
- B. UPDATE
- C. DELETE
- D. INSERT
- Answer: A. SELECT
A foreign key in a relational database is used to:
- A. Link two tables together.
- B. Uniquely identify a record within its own table.
- C. Ensure data integrity within a table.
- D. Specify a range of valid values.
- Answer: A. Link two tables together.
What does ACID stand for in the context of databases?
- A. Atomicity, Consistency, Isolation, Durability
- B. Accuracy, Consistency, Integration, Durability
- C. Atomicity, Clarity, Isolation, Durability
- D. Accuracy, Clarity, Integration, Dependability
- Answer: A. Atomicity, Consistency, Isolation, Durability
Which SQL statement is used to modify data in a database?
- A. SELECT
- B. UPDATE
- C. DELETE
- D. INSERT
- Answer: B. UPDATE
Which of the following SQL clauses is used to filter the result set?
- A. FROM
- B. WHERE
- C. GROUP BY
- D. ORDER BY
- Answer: B. WHERE
The process of breaking down a complex table into simpler tables is called:
- A. Denormalization
- B. Normalization
- C. Structuring
- D. Indexing
- Answer: B. Normalization
In a relational database, a composite key is:
- A. A primary key composed of multiple columns.
- B. A foreign key that links multiple tables.
- C. A unique key that allows null values.
- D. A key that enforces data integrity.
- Answer: A. A primary key composed of multiple columns.

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Relational Database Model MCQs in DBMS
By: Prof. Dr. Fazal Rehman Shamil | Last updated: September 23, 2024

MCQs on Relational Database Model in DBMS

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