DBMS MCQs and Answers With Explanation – Do you want to succeed in an interview or placement test for DBMS? Then you should definitely check out these objective questions with answers for DBMS. Before reviewing the MCQs on Database Management System, it is essential to know what a Database Management System is. Database Management Systems (DBMS) are a crucial component in the field of computer science and information technology, enabling organizations to efficiently store, manage, and retrieve large volumes of data while ensuring data integrity and security.
DBMS Multiple Choice Questions
To test one’s knowledge and understanding of DBMS concepts, tools, and techniques, these DBMS MCQ questions can come in handy. This article provides a set of the Top 60 DBMS MCQs with answers that will help individuals enhance their knowledge and test their comprehension of this essential subject.
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DBMS MCQ Questions
| Name | DBMS |
| Exam Type | MCQ (Multiple Choice Questions) |
| Category | Technical Quiz |
| Mode of Quiz | Online |
Top 50 DBMS MCQ with Answers | Practice Online Quiz
1. Which of the following is NOT a type of database model?
a. Relational model
b. Hierarchical model
c. Network model
d. Logical model
Answer: d. Logical model
Explanation: A logical model is not a type of database model. Rather, it is a representation of the data in a database using a logical language.
2. Which of the following is NOT a type of database schema?
a. Physical schema
b. Logical schema
c. External schema
d. Structural schema
Answer: d. Structural schema
Explanation: A structural schema is not a type of database schema. Rather, it is a term used to refer to the overall organization and structure of a database.
3. Which of the following is NOT a characteristic of a relational database?
a. Data is organized in tables
b. Relationships can be established between tables
c. Data can be accessed using SQL
d. Data is stored in a hierarchical structure
Answer: d. Data is stored in a hierarchical structure
Explanation: Data is not stored in a hierarchical structure in a relational database. Rather, data is organized into tables that can be related to one another.
4. Which of the following is an example of a database management system (DBMS)?
a. MySQL
b. Microsoft Word
c. Adobe Photoshop
d. Mozilla Firefox
Answer: a. MySQL
Explanation: MySQL is an example of a DBMS. Microsoft Word, Adobe Photoshop, and Mozilla Firefox are not DBMSs.
5. What does the acronym ACID stand for in the context of database transactions?
a. Atomicity, Consistency, Isolation, Durability
b. Access, Consistency, Isolation, Durability
c. Atomicity, Compatibility, Isolation, Durability
d. Atomicity, Consistency, Interaction, Durability
Answer: a. Atomicity, Consistency, Isolation, Durability
Explanation: ACID stands for Atomicity, Consistency, Isolation, Durability, which are the four properties that ensure that database transactions are processed reliably.
6. Which of the following is a key feature of a NoSQL database?
a. They use a fixed schema
b. They are designed to handle structured data only
c. They are based on the relational database model
d. They are designed to handle unstructured or semi-structured data
Answer: d. They are designed to handle unstructured or semi-structured data
Explanation: A key feature of NoSQL databases is that they are designed to handle unstructured or semi-structured data, whereas traditional relational databases are designed to handle structured data.
7. Which of the following is NOT a type of NoSQL database?
a. Key-value store
b. Document store
c. Column store
d. Table store
Answer: d. Table store
Explanation: Table store is not a type of NoSQL database. Rather, key-value stores, document stores, and column stores are three common types of NoSQL databases.
8. Which of the following is NOT a benefit of using a database management system?
a. Improved data security
b. Increased data redundancy
c. Improved data integrity
d. Increased data consistency
Answer: b. Increased data redundancy
Explanation: Increased data redundancy is not a benefit of using a database management system. Rather, a DBMS can help reduce data redundancy and improve data efficiency.
9. Which of the following is NOT a type of database query?
a. Select
b. Insert
c. Update
d. Delete
Answer: b. Insert
Explanation: Insert is not a type of database query. Rather, it is a command used to add new data to a database.
10. Which of the following is NOT a valid SQL data type?
a. Integer
b. Float
c. Boolean
d. String
Answer: c. Boolean
Explanation: Boolean is not a valid SQL data type. Rather, it is a logical data type that represents true/false values. The valid SQL data types are integer, float, and string.
11. What does the acronym CRUD stand for in the context of database operations?
a. Create, Read, Update, Delete
b. Copy, Replace, Undo, Delete
c. Compile, Run, Use, Debug
d. Collect, Record, Understand, Deliver
Answer: a. Create, Read, Update, Delete
Explanation: CRUD stands for Create, Read, Update, Delete, which are the four basic operations that can be performed on a database.
12. Which of the following is NOT a type of database index?
a. B-tree index
b. Hash index
c. Binary index
d. Bitmap index
Answer: c. Binary index
Explanation: Binary index is not a type of database index. Rather, B-tree, hash, and bitmap are three common types of database indexes.
13. Which of the following is NOT a type of database join?
a. Inner join
b. Outer join
c. Cross join
d. Nested join
Answer: d. Nested join
Explanation: Nested join is not a type of database join. Rather, inner join, outer join, and cross join are three common types of database joins.
14. Which of the following is NOT a type of database constraint?
a. Primary key
b. Foreign key
c. Unique constraint
d. Index constraint
Answer: d. Index constraint
Explanation: Index constraint is not a type of database constraint. Rather, primary key, foreign key, and unique constraint are three common types of database constraints.
15. Which of the following is NOT a benefit of using a primary key in a database table?
a. Ensures data uniqueness
b. Provides a reference point for foreign keys
c. Improves data efficiency
d. Increases data redundancy
Answer: d. Increases data redundancy
Explanation: Increased data redundancy is not a benefit of using a primary key in a database table. Rather, a primary key can help ensure data uniqueness, provide a reference point for foreign keys, and improve data efficiency.
16. Which of the following is NOT a valid database normalization level?
a. First normal form (1NF)
b. Second normal form (2NF)
c. Third normal form (3NF)
d. Fourth normal form (4NF)
Answer: d. Fourth normal form (4NF)
Explanation: Fourth normal form (4NF) is not a valid database normalization level. Rather, first normal form (1NF), second normal form (2NF), and third normal form (3NF) are the most common levels of database normalization.
17. Which of the following is NOT a type of database backup?
a. Full backup
b. Incremental backup
c. Differential backup
d. Random backup
Answer: d. Random backup
Explanation: Random backup is not a type of database backup. Rather, full backup, incremental backup, and differential backup are three common types of database backups.
18. Which of the following is NOT a type of database recovery technique?
a. Rollback
b. Forward recovery
c. Backward recovery
d. Point-in-time recovery
Answer: c. Backward recovery
Explanation: Backward recovery is not a type of database recovery technique. Rather, rollback, forward recovery, and point-in-time recovery are three common types of database recovery techniques.
19. Which of the following is NOT a type of database trigger?
a. Before trigger
b. After trigger
c. Middle trigger
d. Instead of trigger
Answer: c. Middle trigger
Explanation: Middle trigger is not a type of database trigger. Rather, before trigger, after trigger, and instead of trigger are three common types of database triggers.
20. Which of the following is NOT a type of SQL statement?
a. Select
b. Update
c. Create
d. Append
Answer: d. Append
Explanation: Append is not a type of SQL statement. Rather, select, update, and create are three common types of SQL statements.
21. Which of the following is NOT a valid SQL join type?
a. Inner join
b. Outer join
c. Cross join
d. Diagonal join
Answer: d. Diagonal join
Explanation: Diagonal join is not a valid SQL join type. Rather, inner join, outer join, and cross join are three common SQL join types.
22. Which of the following SQL clauses is used to filter query results based on specified conditions?
a. From
b. Select
c. Where
d. Group by
Answer: c. Where
Explanation: The WHERE clause is used in SQL to filter query results based on specified conditions.
23. Which of the following SQL clauses is used to group query results based on specified columns?
a. From
b. Select
c. Where
d. Group by
Answer: d. Group by
Explanation: The GROUP BY clause is used in SQL to group query results based on specified columns.
24. Which of the following SQL clauses is used to sort query results in ascending or descending order?
a. From
b. Select
c. Order by
d. Group by
Answer: c. Order by
Explanation: The ORDER BY clause is used in SQL to sort query results in ascending or descending order.
25. Which of the following SQL clauses is used to limit the number of rows returned by a query?
a. Top
b. Limit
c. Offset
d. Fetch
Answer: b. Limit
Explanation: The LIMIT clause is used in SQL to limit the number of rows returned by a query.
26. Which of the following SQL functions is used to return the number of rows in a table?
a. Count
b. Sum
c. Avg
d. Max
Answer: a. Count
Explanation: The COUNT function is used in SQL to return the number of rows in a table.
27. Which of the following SQL functions is used to return the highest value in a column?
a. Count
b. Sum
c. Avg
d. Max
Answer: d. Max
Explanation: The MAX function is used in SQL to return the highest value in a column.
28. Which of the following SQL functions is used to return the average value in a column?
a. Count
b. Sum
c. Avg
d. Max
Answer: c. Avg
Explanation: The AVG function is used in SQL to return the average value in a column.
29. Which of the following SQL functions is used to concatenate two or more strings together?
a. Concat
b. Substring
c. Replace
d. Upper
Answer: a. Concat
Explanation: The CONCAT function is used in SQL to concatenate two or more strings together.
30. Which of the following SQL functions is used to replace a substring within a string?
a. Concat
b. Substring
c. Replace
d. Upper
Answer: c. Replace
Explanation: The REPLACE function is used in SQL to replace a substring within a string.
31. Which of the following SQL functions is used to convert all characters in a string to uppercase?
a. Concat
b. Substring
c. Replace
d. Upper
Answer: d. Upper
Explanation: The UPPER function is used in SQL to convert all characters in a string to uppercase.
32. Which of the following SQL data types is used to store a string of characters?
a. Int
b. Float
c. Varchar
d. Date
Answer: c. Varchar
Explanation: The VARCHAR data type is used in SQL to store a string of characters.
33. Which of the following SQL data types is used to store a floating-point number?
a. Int
b. Float
c. Varchar
d. Date
Answer: b. Float
Explanation: The FLOAT data type is used in SQL to store a floating-point number.
34. Which of the following SQL data types is used to store a date and time value?
a. Int
b. Float
c. Varchar
d. Date
Answer: d. Date
Explanation: The DATE data type is used in SQL to store a date and time value.
35. Which of the following SQL data types is used to store an integer value?
a. Int
b. Float
c. Varchar
d. Date
Answer: a. Int
Explanation: The INT data type is used in SQL to store an integer value.
36. Which of the following is NOT a type of SQL constraint?
a. Primary key
b. Foreign key
c. Unique
d. Index
Answer: d. Index
Explanation: Index is not a type of SQL constraint. Rather, primary key, foreign key, and unique are three common types of SQL constraints.
37. Which of the following SQL keywords is used to specify a table’s primary key?
a. Unique
b. Index
c. Primary key
d. Foreign key
Answer: c. Primary key
Explanation: The PRIMARY KEY keyword is used in SQL to specify a table’s primary key.
38. Which of the following SQL keywords is used to specify a table’s foreign key?
a. Unique
b. Index
c. Primary key
d. Foreign key
Answer: d. Foreign key
Explanation: The FOREIGN KEY keyword is used in SQL to specify a table’s foreign key.
39. Which of the following SQL keywords is used to create a new table?
a. Select
b. Create
c. Alter
d. Drop
Answer: b. Create
Explanation: The CREATE keyword is used in SQL to create a new table.
40. Which of the following SQL keywords is used to modify an existing table?
a. Select
b. Create
c. Alter
d. Drop
Answer: c. Alter
Explanation: The ALTER keyword is used in SQL to modify an existing table.
41. Which of the following SQL keywords is used to delete a table?
a. Select
b. Create
c. Alter
d. Drop
Answer: d. Drop
Explanation: The DROP keyword is used in SQL to delete a table.
42. Which of the following SQL keywords is used to insert data into a table?
a. Insert
b. Update
c. Delete
d. Merge
Answer: a. Insert
Explanation: The INSERT keyword is used in SQL to insert data into a table.
43. Which of the following SQL keywords is used to update data in a table?
a. Insert
b. Update
c. Delete
d. Merge
Answer: b. Update
Explanation: The UPDATE keyword is used in SQL to update data in a table.
44. Which of the following SQL keywords is used to delete data from a table?
a. Insert
b. Update
c. Delete
d. Merge
Answer: c. Delete
Explanation: The DELETE keyword is used in SQL to delete data from a table.
45. Which of the following SQL keywords is used to join two tables together?
a. Join
b. Union
c. Select
d. From
Answer: a. Join
Explanation: The JOIN keyword is used in SQL to join two tables together.
46. Which of the following SQL keywords is used to select data from a table?
a. Join
b. Union
c. Select
d. From
Answer: c. Select
Explanation: The SELECT keyword is used in SQL to select data from a table.
47. Which of the following SQL keywords is used to combine the results of two SELECT statements?
a. Join
b. Union
c. Select
d. From
Answer: b. Union
Explanation: The UNION keyword is used in SQL to combine the results of two SELECT statements.
48. Which of the following SQL keywords is used to group rows based on a specific column?
a. Group by
b. Order by
c. Having
d. Where
Answer: a. Group by
Explanation: The GROUP BY keyword is used in SQL to group rows based on a specific column.
49. Which of the following SQL keywords is used to sort rows based on a specific column?
a. Group by
b. Order by
c. Having
d. Where
Answer: b. Order by
Explanation: The ORDER BY keyword is used in SQL to sort rows based on a specific column.
50. Which of the following SQL keywords is used to filter rows based on a specific condition?
a. Group by
b. Order by
c. Having
d. Where
Answer: d. Where
Explanation: The WHERE keyword is used in SQL to filter rows based on a specific condition.
51. Which of the following SQL keywords is used to specify a condition to be applied to a group in a GROUP BY clause?
a. Group by
b. Order by
c. Having
d. Where
Answer: c. Having
Explanation: The HAVING keyword is used in SQL to specify a condition to be applied to a group in a GROUP BY clause.
52. Which of the following SQL clauses is used to specify which columns should be included in a SELECT statement?
a. Select
b. From
c. Where
d. Order by
Answer: a. Select
Explanation: The SELECT clause is used in SQL to specify which columns should be included in a SELECT statement.
53. Which of the following SQL clauses is used to specify which table(s) to select data from?
a. Select
b. From
c. Where
d. Order by
Answer: b. From
Explanation: The FROM clause is used in SQL to specify which table(s) to select data from.
54. Which of the following SQL clauses is used to specify conditions to filter rows?
a. Select
b. From
c. Where
d. Order by
Answer: c. Where
Explanation: The WHERE clause is used in SQL to specify conditions to filter rows.
55. Which of the following SQL clauses is used to sort the output of a SELECT statement?
a. Select
b. From
c. Where
d. Order by
Answer: d. Order by
Explanation: The ORDER BY
56. Which of the following SQL clauses is used to group rows based on a specific column?
a. Group by
b. Order by
c. Having
d. Where
Answer: a. Group by
Explanation: The GROUP BY clause is used in SQL to group rows based on a specific column.
57. Which of the following SQL clauses is used to filter rows based on a specific condition after grouping?
a. Group by
b. Order by
c. Having
d. Where
Answer: c. Having
Explanation: The HAVING clause is used in SQL to filter rows based on a specific condition after grouping.
58. Which of the following SQL clauses is used to join two or more tables together?
a. Join
b. Union
c. Select
d. From
Answer: a. Join
Explanation: The JOIN clause is used in SQL to join two or more tables together.
59. Which of the following SQL clauses is used to combine the results of two SELECT statements?
a. Join
b. Union
c. Select
d. From
Answer: b. Union
Explanation: The UNION clause is used in SQL to combine the results of two SELECT statements.
60. Which of the following SQL clauses is used to order the result set of a SELECT statement?
a. Join
b. Union
c. Select
d. Order by
Answer: d. Order by
Explanation: The ORDER BY clause is used in SQL to order the result set of a SELECT statement.
Mastering DBMS concepts, tools, and techniques is essential for any individual seeking a career in the field of database management. These DBMS Multiple Choice Questions provide a useful tool for assessing and enhancing one’s knowledge of this critical subject. If you find these DBMS MCQs useful, we suggest browsing our Freshersnow website to find more IT-related quizzes.