tables, attributes, tuples, and relations MCQs in DBMS

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1. In a relational database, a table is also known as a:



2. Which of the following best describes a tuple in a relational database?



3. In a relational database, an attribute is:



4. Which term is used to describe the set of all possible values an attribute can have?



5. A relation in a relational database can be defined as:



6. Which of the following is a key characteristic of a relation (table) in a relational database?



7. In the context of a relational database, a primary key is:



8. Which of the following is true about a foreign key in a relational database?



9. The degree of a relation refers to:



10. The cardinality of a relation refers to:



11. Which of the following best describes a composite key?



12. Which of the following SQL commands is used to create a new table in a database?



13. What is the purpose of the NOT NULL constraint in a table column?



14. Which SQL statement is used to modify an existing table structure, such as adding a new column?



15. In a relational database, the term “schema” refers to:



16. Which of the following is an example of an attribute in a student database table?



17. Which SQL keyword is used to retrieve data from a database table?



18. Which of the following best describes the term “relation” in the context of a relational database?



19. Which SQL command is used to remove a table from a database?



20. In a relational database, a candidate key is:



  • Which of the following best describes the term “relation” in the context of a relational database?
    • A. A method for querying data.
    • B. A mathematical concept represented by a table.
    • C. A unique identifier for a row.
    • D. A column in a table.
    • Answer: B. A mathematical concept represented by a table.
  • Which SQL command is used to remove a table from a database?
    • A. DELETE TABLE
    • B. REMOVE TABLE
    • C. DROP TABLE
    • D. ALTER TABLE
    • Answer: C. DROP TABLE
  • In a relational database, a candidate key is:
    • A. A key that can uniquely identify a row but is not chosen as the primary key.
    • B. A key that cannot contain null values.
    • C. A key that is composed of multiple columns.
    • D. A key that links two tables together.
    • Answer: A. A key that can uniquely identify a row but is not chosen as the primary key.

    •  

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