Integrity constraints MCQs in DBMS

By: Prof. Dr. Fazal Rehman | Last updated: September 23, 2024

MCQs on Integrity Constraints in DBMS

  1. What is an integrity constraint?
    • a) A rule that limits the type of data that can be entered into a database
    • b) A mechanism to improve database performance
    • c) A software that manages the database
    • d) A query language for databases
    Answer: a) A rule that limits the type of data that can be entered into a database
  2. Which type of integrity constraint ensures that all values in a column are unique and not null?
    • a) PRIMARY KEY
    • b) UNIQUE
    • c) FOREIGN KEY
    • d) CHECK
    Answer: a) PRIMARY KEY
  3. What is the purpose of a foreign key constraint?
    • a) To ensure that all values in a column are unique
    • b) To link two tables together
    • c) To restrict the values that can be placed in a column
    • d) To ensure that all columns have non-null values
    Answer: b) To link two tables together
  4. Which integrity constraint enforces the domain integrity by limiting the values that can be placed in a column?
    • a) PRIMARY KEY
    • b) UNIQUE
    • c) FOREIGN KEY
    • d) CHECK
    Answer: d) CHECK
  5. Which of the following is true about the NOT NULL constraint?
    • a) It ensures that all values in a column are unique.
    • b) It ensures that a column cannot have null values.
    • c) It links two tables together.
    • d) It restricts the values that can be placed in a column.
    Answer: b) It ensures that a column cannot have null values.
  6. Which integrity constraint can be used to enforce referential integrity?
    • a) PRIMARY KEY
    • b) UNIQUE
    • c) FOREIGN KEY
    • d) CHECK
    Answer: c) FOREIGN KEY
  7. What does the UNIQUE constraint do?
    • a) Ensures that a column cannot have null values.
    • b) Ensures that all values in a column are unique.
    • c) Links two tables together.
    • d) Limits the values that can be placed in a column.
    Answer: b) Ensures that all values in a column are unique.
  8. Which integrity constraint ensures entity integrity?
    • a) PRIMARY KEY
    • b) UNIQUE
    • c) FOREIGN KEY
    • d) CHECK
    Answer: a) PRIMARY KEY
  9. Which of the following statements about the PRIMARY KEY constraint is true?
    • a) A table can have multiple primary keys.
    • b) A table can have only one primary key.
    • c) A primary key can have duplicate values.
    • d) A primary key column can have null values.
    Answer: b) A table can have only one primary key.
  10. Which integrity constraint ensures that the relationship between two tables remains consistent?
    • a) PRIMARY KEY
    • b) UNIQUE
    • c) FOREIGN KEY
    • d) CHECK
    Answer: c) FOREIGN KEY
  11. Which of the following constraints ensures that all entries in a column are different?
    • a) PRIMARY KEY
    • b) NOT NULL
    • c) UNIQUE
    • d) FOREIGN KEY
    Answer: c) UNIQUE
  12. What happens if a NOT NULL constraint is violated?
    • a) The transaction is committed.
    • b) The column value is automatically set to zero.
    • c) The transaction is rolled back.
    • d) A warning is generated, but the row is inserted.
    Answer: c) The transaction is rolled back.
  13. What is the role of the CHECK constraint?
    • a) To ensure that a column cannot have null values.
    • b) To limit the values that can be placed in a column based on a specific condition.
    • c) To ensure that all values in a column are unique.
    • d) To link two tables together.
    Answer: b) To limit the values that can be placed in a column based on a specific condition.
  14. Which constraint would you use to ensure that the values in a column match a specified condition?
    • a) PRIMARY KEY
    • b) UNIQUE
    • c) FOREIGN KEY
    • d) CHECK
    Answer: d) CHECK
  15. Which integrity constraint is violated when a foreign key references a non-existent primary key value?
    • a) Entity integrity
    • b) Domain integrity
    • c) Referential integrity
    • d) Key integrity
    Answer: c) Referential integrity
 

More MCQs Of Database Systems

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