Integrity constraints MCQs in DBMS

By: Prof. Dr. Fazal Rehman Shamil | 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

  1. Database Models MCQs in DBMS
    1. Hierarchical model MCQs in DBMS
    2. Network model MCQs in DBMS
    3. Relational model MCQs in DBMS
    4. Object-oriented model MCQs in DBMS
    5. NoSQL databases MCQs in DBMS
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    1. tables, attributes, tuples, and relations MCQs in DBMS
    2. Primary keys and foreign keys MCQs in DBMS
    3. Integrity constraints MCQs in DBMS
  3. SQL (Structured Query Language) MCQs in DBMS
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    2. Data Manipulation Language (DML) MCQs in DBMS
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    4. Transaction Control Language (TCL) MCQs in DBMS
    5. Advanced SQL queries and functions MCQs in DBMS
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    1. Entity-Relationship (ER) modeling MCQs in DBMS
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    2. Data independence MCQs in DBMS
    3. DBMS components and functions MCQs in DBMS
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    1. Data storage on physical media MCQs in DBMS
    2. File organization and access methods MCQs
    3. Indexing (B-trees, hash indexing) MCQs in DBMS
    4. RAID technology MCQs in DBMS
  7. Query Processing and Optimization MCQs in DBMS
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    1. ACID properties (Atomicity, Consistency, Isolation, Durability) MCQs in DBMS
    2. Transaction states and lifecycle MCQs in DBMS
    3. Concurrency control techniques (locking, timestamping, multiversion) MCQs in DBMS
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    2. Data encryption techniques MCQs in DBMS
    3. Role-based access control MCQs in DBMS
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    1. Backup types and strategies MCQs in DBMS
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    3. Distributed query processing MCQs in DBMS
    4. Consistency models and protocols MCQs in DBMS
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