Data Definition Language (DDL) MCQs in DBMS

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

MCQs on Data Definition Language (DDL) in DBMS

1. Which SQL statement is used to create a new table in a database?
   • a) INSERT TABLE
   • b) NEW TABLE
   • c) CREATE TABLE
   • d) ADD TABLE
   Answer: c) CREATE TABLE
2. What does the ALTER TABLE statement do?
   • a) Deletes an existing table
   • b) Creates a new table
   • c) Modifies the structure of an existing table
   • d) Renames a table
   Answer: c) Modifies the structure of an existing table
3. Which SQL statement is used to delete a table from the database?
   • a) REMOVE TABLE
   • b) DELETE TABLE
   • c) DROP TABLE
   • d) TRUNCATE TABLE
   Answer: c) DROP TABLE
4. What is the purpose of the TRUNCATE TABLE statement?
   • a) To delete a table structure
   • b) To remove all records from a table, but keep the table structure
   • c) To delete specific records from a table
   • d) To alter the structure of a table
   Answer: b) To remove all records from a table, but keep the table structure
5. Which of the following SQL statements is used to add a new column to an existing table?
   • a) MODIFY TABLE
   • b) ADD COLUMN
   • c) ALTER TABLE
   • d) UPDATE TABLE
   Answer: c) ALTER TABLE
6. Which SQL statement is used to rename an existing table?
   • a) RENAME TABLE
   • b) ALTER TABLE
   • c) MODIFY TABLE
   • d) CHANGE TABLE
   Answer: b) ALTER TABLE
7. What does the SQL command DROP COLUMN do?
   • a) Removes a column and all its data from a table
   • b) Deletes the entire table
   • c) Removes a column but keeps the data
   • d) Changes the name of a column
   Answer: a) Removes a column and all its data from a table
8. What is the purpose of the CREATE INDEX statement?
   • a) To create a new table with an index
   • b) To create a unique constraint on a column
   • c) To improve the performance of queries by creating an index on a table
   • d) To create a new view
   Answer: c) To improve the performance of queries by creating an index on a table
9. Which SQL command is used to define a new constraint on a table?
   • a) CREATE CONSTRAINT
   • b) ADD CONSTRAINT
   • c) ALTER CONSTRAINT
   • d) DEFINE CONSTRAINT
   Answer: b) ADD CONSTRAINT
10. What does the SQL statement ALTER TABLE DROP CONSTRAINT do?
    • a) Removes the entire table
    • b) Deletes a specific constraint from the table
    • c) Adds a new constraint to the table
    • d) Renames the constraint
    Answer: b) Deletes a specific constraint from the table
11. Which command is used to change the data type of an existing column in a table?
    • a) ALTER TABLE
    • b) MODIFY TABLE
    • c) UPDATE TABLE
    • d) CHANGE COLUMN
    Answer: a) ALTER TABLE
12. What does the SQL statement CREATE VIEW do?
    • a) Creates a new table in the database
    • b) Defines a virtual table based on a query
    • c) Deletes an existing table
    • d) Modifies the structure of an existing table
    Answer: b) Defines a virtual table based on a query
13. Which SQL command is used to add a primary key constraint to an existing table?
    • a) ALTER TABLE … ADD PRIMARY KEY
    • b) MODIFY TABLE … PRIMARY KEY
    • c) CREATE PRIMARY KEY
    • d) ADD PRIMARY KEY TO TABLE
    Answer: a) ALTER TABLE … ADD PRIMARY KEY
14. What does the SQL command RENAME TABLE do?
    • a) Changes the name of an existing table
    • b) Creates a new table with a different name
    • c) Deletes the existing table
    • d) Renames a column in the table
    Answer: a) Changes the name of an existing table
15. Which SQL command is used to remove an index from a table?
    • a) DROP INDEX
    • b) REMOVE INDEX
    • c) DELETE INDEX
    • d) ALTER INDEX
    Answer: a) DROP INDEX

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
2. Relational Database Model MCQs in DBMS
   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
   1. Data Definition Language (DDL) MCQs in DBMS
   2. Data Manipulation Language (DML) MCQs in DBMS
   3. Data Control Language (DCL) MCQs in DBMS
   4. Transaction Control Language (TCL) MCQs in DBMS
   5. Advanced SQL queries and functions MCQs in DBMS
4. Database Design MCQs in DBMS
   1. Entity-Relationship (ER) modeling MCQs in DBMS
   2. Extended ER modeling MCQs in DBMS
   3. Normalization and normal forms (1NF, 2NF, 3NF, BCNF) MCQs in DBMS
   4. Denormalization MCQs in DBMS
5. Database Management System Architecture MCQs in DBMS
   1. Three-schema architecture (external, conceptual, internal) MCQs in DBMS
   2. Data independence MCQs in DBMS
   3. DBMS components and functions MCQs in DBMS
6. Storage and File Structure MCQs in DBMS
   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
8. Database Transaction Management MCQs in DBMS
   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
   4. Deadlock detection and resolution MCQs in DBMS
9. Database Security and Authorization MCQs in DBMS
   1. Authentication and authorization mechanisms MCQs in DBMS
   2. Data encryption techniques MCQs in DBMS
   3. Role-based access control MCQs in DBMS
   4. SQL injection prevention MCQs in DBMS
10. Backup and Recovery MCQs in DBMS
    1. Backup types and strategies MCQs in DBMS
    2. Recovery techniques (log-based, shadow paging) MCQs in DBMS
    3. Disaster recovery planning MCQs in DBMS
11. Distributed Databases MCQs in DBMS
    1. Distributed database architecture MCQs MCQs in DBMS
    2. Data fragmentation, replication, and allocation in DBMS
    3. Distributed query processing MCQs in DBMS
    4. Consistency models and protocols MCQs in DBMS

1. SET 1: database design mcqs (database design mcqs )
2. SET 2: database mcqs with answers pdf (database mcqs with answers pdf )
3. SET 3: modern database management 12th edition mcqs (modern database management 12th edition mcqs)
4. SET 4: database systems mcqs (database systems mcqs)
5. SET 5: dbms mcqs (dbms mcqs )
6. SET 6: dbms mcqs with answers (dbms mcqs with answers)
7. SET 7: solved mcqs of dbms (solved mcqs of dbms)
8. SET 8: dbms mcqs with answers pdf(dbms mcqs with answers pdf)
9. SET 9: relational database management system mcqs(relational database management system mcqs)
10. SET 10: solved mcqs of database management system(solved mcqs of database management system)
11. SET 11: basic database mcqs pdf (basic database mcqs pdf)
12. SET 12: relational database management system mcqs (relational database management system mcqs )
13. SET 13: database mcqs online test (database mcqs online test)
14. SET 14: database interview questions mcqs (database interview questions mcqs)
15. SET 15: database developer mcqs (database developer mcqs)
16. SET 16: database Repeated mcqs (database Repeated mcqs)
17. SET 17: Database mcqs PPSC (Database mcqs PPSC)
18. SET 18: Database mcqs FPSC (Database mcqs FPSC)
19. SET 19: DBMS mcqs FPSC (DBMS mcqs FPSC)