Which of the following is not a type of database management system?
a) Relational Database Management System (RDBMS)
b) NoSQL Database Management System
c) Object-Oriented Database Management System (OODBMS)
d) Logical Database Management System (LDBMS)
Answer: d) Logical Database Management System (LDBMS)
Which database model uses a collection of key-value pairs for data representation?
a) Relational
b) Object-Oriented
c) Document
d) Network
Answer: c) Document
In a relational database, what is a tuple?
a) A column in a table
b) A row in a table
c) A unique identifier for a table
d) A primary key
Answer: b) A row in a table
What is the purpose of SQL (Structured Query Language) in database management systems?
a) To define the structure of a database
b) To manipulate and query data in a database
c) To optimize database performance
d) To design user interfaces for databases
Answer: b) To manipulate and query data in a database
Which of the following is not a valid SQL data type?
a) Integer
b) Boolean
c) Text
d) Float
Answer: b) Boolean
What does ACID stand for in database transactions?
a) Atomicity, Consistency, Isolation, Durability
b) Availability, Consistency, Integrity, Durability
c) Atomicity, Compatibility, Isolation, Durability
d) Availability, Compatibility, Isolation, Durability
Answer: a) Atomicity, Consistency, Isolation, Durability
Which of the following statements is true about a primary key in a database table?
a) It must be unique for each row in the table
b) It can contain NULL values
c) It can be duplicated within the table
d) It can only be a numeric data type
Answer: a) It must be unique for each row in the table
What is a foreign key in a relational database?
a) It is used for encryption of data
b) It is a key used for indexing purposes
c) It establishes a relationship between two tables
d) It is a key that is generated automatically by the system
Answer: c) It establishes a relationship between two tables
Which of the following statements is true about the normalization process in database design?
a) It increases data redundancy
b) It decreases data integrity
c) It reduces data redundancy
d) It slows down database performance
Answer: c) It reduces data redundancy
What is the purpose of indexing in a database?
a) To decrease data storage space
b) To increase data redundancy
c) To speed up data retrieval
d) To decrease data integrity
Answer: c) To speed up data retrieval
Which of the following is an example of a NoSQL database?
a) MySQL
b) Oracle
c) MongoDB
d) SQL Server
Answer: c) MongoDB
Which database model allows for flexible and dynamic schema?
a) Relational
b) Object-Oriented
c) Document
d) Network
Answer: c) Document
In a relational database, what is a view?
a) A virtual table based on the result of a SQL query
b) A physical table that stores data permanently
c) A foreign key used to establish relationships between tables
d) An index used for fast data retrieval
Answer: a) A virtual table based on the result of a SQL query
Which of the following is an advantage of using stored procedures in a database?
a) Increased security
b) Reduced data redundancy
c) Improved data indexing
d) Decreased database performance
Answer: a) Increased security
Which SQL command is used to retrieve data from a database table?
a) UPDATE
b) SELECT
c) DELETE
d) INSERT
Answer: b) SELECT
What is the purpose of a transaction in a database?
a) To establish a connection to the database server
b) To manage database users and permissions
c) To group database operations into a single unit of work
d) To optimize database performance
Answer: c) To group database operations into a single unit of work
Which of the following is not a type of database index?
a) B-tree index
b) Hash index
c) Sequential index
d) Bitmap index
Answer: c) Sequential index
What is the purpose of a database trigger?
a) To automatically execute a set of actions when certain database events occur
b) To manage user permissions in the database
c) To optimize database performance
d) To define the structure of the database schema
Answer: a) To automatically execute a set of actions when certain database events occur
What does SQL stand for?
a) Standard Query Language
b) Structured Query Language
c) Systematic Query Language
d) Simplified Query Language
Answer: b) Structured Query Language
Which of the following is a valid SQL command for deleting data from a table?
a) REMOVE
b) ERASE
c) DELETE
d) CLEAN
Answer: c) DELETE
What is the purpose of data normalization in database design?
a) To reduce data redundancy and improve data integrity
b) To increase data redundancy and decrease data integrity
c) To encrypt sensitive data in the database
d) To speed up data retrieval from the database
Answer: a) To reduce data redundancy and improve data integrity
Which of the following is not a characteristic of a well-designed database schema?
a) Minimal data redundancy
b) Efficient data indexing
c) High data integrity
d) Complex data normalization
Answer: d) Complex data normalization
What is the purpose of a database index?
a) To store primary keys
b) To provide a physical structure for data storage
c) To speed up data retrieval operations
d) To enforce data integrity constraints
Answer: c) To speed up data retrieval operations
Which of the following is not a type of database constraint?
a) Primary key
b) Foreign key
c) Default value
d) Table lock
Answer: d) Table lock
What is the purpose of the COMMIT statement in database transactions?
a) To permanently save changes made during the transaction
b) To roll back changes made during the transaction
c) To temporarily suspend the transaction
d) To retrieve data from the database
Answer: a) To permanently save changes made during the transaction
Which SQL command is used to add new rows of data to a table?
a) UPDATE
b) INSERT
c) DELETE
d) SELECT
Answer: b) INSERT
What is the purpose of database normalization?
a) To increase data redundancy
b) To decrease data integrity
c) To reduce data duplication and dependency
d) To speed up data retrieval
Answer: c) To reduce data duplication and dependency
What does the term “ACID properties” refer to in database transactions?
a) Atomicity, Consistency, Isolation, Durability
b) Availability, Consistency, Integrity, Durability
c) Atomicity, Compatibility, Isolation, Durability
d) Availability, Compatibility, Isolation, Durability
Answer: a) Atomicity, Consistency, Isolation, Durability
Which of the following is not a valid SQL aggregate function?
a) COUNT
b) SUM
c) AVG
d) FIND
Answer: d) FIND
Which SQL command is used to modify existing data in a table?
a) ALTER
b) UPDATE
c) MODIFY
d) CHANGE
Answer: b) UPDATE
What is the purpose of a database transaction?
a) To execute a single SQL statement
b) To group multiple SQL statements into a single unit of work
c) To query data from the database
d) To delete data from the database
Answer: b) To group multiple SQL statements into a single unit of work
Which of the following is not a valid SQL data type?
a) VARCHAR
b) INTEGER
c) BOOLEAN
d) DATE
Answer: c) BOOLEAN
What is the purpose of referential integrity in database management?
a) To ensure that primary keys are unique
b) To enforce relationships between tables using foreign keys
c) To speed up data retrieval operations
d) To encrypt sensitive data in the database
Answer: b) To enforce relationships between tables using foreign keys
Which of the following statements is true about database views?
a) They are physical tables that store data permanently
b) They cannot be queried like regular database tables
c) They are virtual tables based on the result of a SQL query
d) They are used to store indexes for fast data retrieval
Answer: c) They are virtual tables based on the result of a SQL query
What is the purpose of the ROLLBACK statement in database transactions?
a) To permanently save changes made during the transaction
b) To roll back changes made during the transaction
c) To temporarily suspend the transaction
d) To retrieve data from the database
Answer: b) To roll back changes made during the transaction
What is the role of a database administrator (DBA)?
a) To design and implement database schemas
b) To optimize database performance
c) To manage user permissions and access control
d) All of the above
Answer: d) All of the above
Which of the following is not a valid SQL join type?
a) INNER JOIN
b) OUTER JOIN
c) CROSS JOIN
d) MERGE JOIN
Answer: d) MERGE JOIN
What is the purpose of a database trigger?
a) To automatically execute a set of actions when certain database events occur
b) To manage user permissions in the database
c) To optimize database performance
d) To define the structure of the database schema
Answer: a) To automatically execute a set of actions when certain database events occur
Which of the following is not a characteristic of a well-designed database schema?
a) Minimal data redundancy
b) Efficient data indexing
c) High data integrity
d) Complex data normalization
Answer: d) Complex data normalization
What is the purpose of a database index?
a) To store primary keys
b) To provide a physical structure for data storage
c) To speed up data retrieval operations
d) To enforce data integrity constraints
Answer: c) To speed up data retrieval operations
Which of the following is not a type of database constraint?
a) Primary key
b) Foreign key
c) Default value
d) Table lock
Answer: d) Table lock
What is the purpose of the COMMIT statement in database transactions?
a) To permanently save changes made during the transaction
b) To roll back changes made during the transaction
c) To temporarily suspend the transaction
d) To retrieve data from the database
Answer: a) To permanently save changes made during the transaction
Which SQL command is used to add new rows of data to a table?
a) UPDATE
b) INSERT
c) DELETE
d) SELECT
Answer: b) INSERT
What is the purpose of data normalization in database design?
a) To reduce data redundancy and improve data integrity
b) To increase data redundancy and decrease data integrity
c) To encrypt sensitive data in the database
d) To speed up data retrieval from the database
Answer: a) To reduce data redundancy and improve data integrity
Which of the following is not a valid SQL aggregate function?
a) COUNT
b) SUM
c) AVG
d) FIND
Answer: d) FIND
Which SQL command is used to modify existing data in a table?
a) ALTER
b) UPDATE
c) MODIFY
d) CHANGE
Answer: b) UPDATE
What is the purpose of a database transaction?
a) To execute a single SQL statement
b) To group multiple SQL statements into a single unit of work
c) To query data from the database
d) To delete data from the database
Answer: b) To group multiple SQL statements into a single unit of work
Which of the following is not a valid SQL data type?
a) VARCHAR
b) INTEGER
c) BOOLEAN
d) DATE
Answer: c) BOOLEAN
What is the purpose of referential integrity in database management?
a) To ensure that primary keys are unique
b) To enforce relationships between tables using foreign keys
c) To speed up data retrieval operations
d) To encrypt sensitive data in the database
Answer: b) To enforce relationships between tables using foreign keys
Which of the following statements is true about database views?
a) They are physical tables that store data permanently
b) They cannot be queried like regular database tables
c) They are virtual tables based on the result of a SQL query
d) They are used to store indexes for fast data retrieval
Answer: c) They are virtual tables based on the result of a SQL query
