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All questions of Database System Architectures for Software Development Exam
Consider the following Python code snippet:def factorial(n):
if n == 0:
return 1
else:
return n * factorial(n - 1)result = factorial(5)
print(result)
What will be the output of the above code?- a)1
- b)5
- c)15
- d)120
Correct answer is option 'D'. Can you explain this answer?
Consider the following Python code snippet:
def factorial(n):
if n == 0:
return 1
else:
return n * factorial(n - 1)
if n == 0:
return 1
else:
return n * factorial(n - 1)
result = factorial(5)
print(result)
What will be the output of the above code?
print(result)
What will be the output of the above code?
a)
1
b)
5
c)
15
d)
120
|
Code Nation answered |
The Python code recursively calculates the factorial of a number (5 in this case).
Consider the following SQL code snippet:SELECT AVG(price) FROM products WHERE category = 'Electronics';What does this query calculate?- a)The average price of all products in the "Electronics" category
- b)The sum of the prices of all products in the "Electronics" category
- c)The maximum price of all products in the "Electronics" category
- d)The minimum price of all products in the "Electronics" category
Correct answer is option 'A'. Can you explain this answer?
Consider the following SQL code snippet:
SELECT AVG(price) FROM products WHERE category = 'Electronics';
What does this query calculate?
a)
The average price of all products in the "Electronics" category
b)
The sum of the prices of all products in the "Electronics" category
c)
The maximum price of all products in the "Electronics" category
d)
The minimum price of all products in the "Electronics" category
|
TeamUnknown answered |
The SQL query "SELECT AVG(price) FROM products WHERE category = 'Electronics';" calculates the average price of all products in the "Electronics" category.
Consider the following SQL query:SELECT AVG(salary) FROM employees WHERE department = 'Sales';
What will be the output of the above query?- a)Average salary of all employees in the database
- b)Average salary of employees in the 'Sales' department
- c)Total salary of employees in the 'Sales' department
- d)Number of employees in the 'Sales' department
Correct answer is option 'B'. Can you explain this answer?
Consider the following SQL query:
SELECT AVG(salary) FROM employees WHERE department = 'Sales';
What will be the output of the above query?
What will be the output of the above query?
a)
Average salary of all employees in the database
b)
Average salary of employees in the 'Sales' department
c)
Total salary of employees in the 'Sales' department
d)
Number of employees in the 'Sales' department
|
Tom Tattle answered |
The SQL query calculates the average salary of employees in the 'Sales' department.
Consider the following SQL query:SELECT DISTINCT department_id FROM employees;
What does the above query return?- a)Department IDs of all employees
- b)Department IDs of employees with distinct salaries
- c)Department IDs of employees in the 'Sales' department
- d)Department IDs of all unique departments
Correct answer is option 'D'. Can you explain this answer?
Consider the following SQL query:
SELECT DISTINCT department_id FROM employees;
What does the above query return?
What does the above query return?
a)
Department IDs of all employees
b)
Department IDs of employees with distinct salaries
c)
Department IDs of employees in the 'Sales' department
d)
Department IDs of all unique departments
|
Tanuja Mishra answered |
The SQL query retrieves distinct department IDs from the "employees" table.
Consider the following SQL query:SELECT COUNT(DISTINCT department_id) FROM employees;
What does the above query return?- a)Total number of employees in the database
- b)Number of unique department IDs in the database
- c)Number of employees in the 'Sales' department
- d)Number of employees with distinct salaries
Correct answer is option 'B'. Can you explain this answer?
Consider the following SQL query:
SELECT COUNT(DISTINCT department_id) FROM employees;
What does the above query return?
What does the above query return?
a)
Total number of employees in the database
b)
Number of unique department IDs in the database
c)
Number of employees in the 'Sales' department
d)
Number of employees with distinct salaries
|
|
Tanuja Mishra answered |
The SQL query counts the number of distinct department IDs in the "employees" table.
Consider the following Python code snippet:my_list = [1, 2, 3, 4, 5]
new_list = [x * 2 for x in my_list if x % 2 == 0]
print(new_list)
What will be the output of the above code?- a)[2, 4, 6, 8, 10]
- b)[2, 4]
- c)[4, 8]
- d)[8]
Correct answer is option 'C'. Can you explain this answer?
Consider the following Python code snippet:
my_list = [1, 2, 3, 4, 5]
new_list = [x * 2 for x in my_list if x % 2 == 0]
print(new_list)
What will be the output of the above code?
new_list = [x * 2 for x in my_list if x % 2 == 0]
print(new_list)
What will be the output of the above code?
a)
[2, 4, 6, 8, 10]
b)
[2, 4]
c)
[4, 8]
d)
[8]
|
|
Tom Tattle answered |
The Python code filters the elements from the list "my_list" that are even (x % 2 == 0) and doubles them.
Which of the following is a disadvantage of distributed database systems?- a)Improved fault tolerance
- b)Increased data availability
- c)Complexity in data management
- d)Reduced network latency
Correct answer is option 'C'. Can you explain this answer?
Which of the following is a disadvantage of distributed database systems?
a)
Improved fault tolerance
b)
Increased data availability
c)
Complexity in data management
d)
Reduced network latency
|
Diksha Sharma answered |
Distributed database systems introduce complexities in managing data across multiple nodes and ensuring consistency.
Consider the following SQL query:SELECT COUNT(*) FROM employees WHERE salary > 50000;
What will be the output of the above query?- a)Total number of employees with a salary greater than 50000
- b)Total number of employees in the database
- c)Total salary of all employees with a salary greater than 50000
- d)Average salary of employees with a salary greater than 50000
Correct answer is option 'A'. Can you explain this answer?
Consider the following SQL query:
SELECT COUNT(*) FROM employees WHERE salary > 50000;
What will be the output of the above query?
What will be the output of the above query?
a)
Total number of employees with a salary greater than 50000
b)
Total number of employees in the database
c)
Total salary of all employees with a salary greater than 50000
d)
Average salary of employees with a salary greater than 50000
|
Baishali Singh answered |
> 50000;
This query counts the number of rows in the "employees" table where the salary is greater than 50000.
This query counts the number of rows in the "employees" table where the salary is greater than 50000.
Consider the following SQL query:SELECT e.employee_name, d.department_name
FROM employees e
JOIN departments d ON e.department_id = d.department_id
WHERE e.salary > (SELECT AVG(salary) FROM employees)
ORDER BY e.employee_name;
What does the above query return?- a)Names of employees in the departments with the highest average salary
- b)Names of employees with a salary higher than the average salary
- c)Names of employees and their corresponding department names
- d)Names of employees in the departments with the lowest average salary
Correct answer is option 'B'. Can you explain this answer?
Consider the following SQL query:
SELECT e.employee_name, d.department_name
FROM employees e
JOIN departments d ON e.department_id = d.department_id
WHERE e.salary > (SELECT AVG(salary) FROM employees)
ORDER BY e.employee_name;
What does the above query return?
FROM employees e
JOIN departments d ON e.department_id = d.department_id
WHERE e.salary > (SELECT AVG(salary) FROM employees)
ORDER BY e.employee_name;
What does the above query return?
a)
Names of employees in the departments with the highest average salary
b)
Names of employees with a salary higher than the average salary
c)
Names of employees and their corresponding department names
d)
Names of employees in the departments with the lowest average salary
|
Aditi Sen answered |
The SQL query is incomplete as the condition for the salary is missing.
To complete the query, we need to specify a condition for the salary in the WHERE clause. For example, if we want to select employees with a salary greater than 50000, the query would be:
SELECT e.employee_name, d.department_name
FROM employees e
JOIN departments d ON e.department_id = d.department_id
WHERE e.salary > 50000
To complete the query, we need to specify a condition for the salary in the WHERE clause. For example, if we want to select employees with a salary greater than 50000, the query would be:
SELECT e.employee_name, d.department_name
FROM employees e
JOIN departments d ON e.department_id = d.department_id
WHERE e.salary > 50000
Consider the following Python code snippet:my_dict = {'a': 1, 'b': 2, 'c': 3}
result = sum(my_dict.values())
print(result)
What will be the output of the above code?- a)1
- b)2
- c)3
- d)6
Correct answer is option 'D'. Can you explain this answer?
Consider the following Python code snippet:
my_dict = {'a': 1, 'b': 2, 'c': 3}
result = sum(my_dict.values())
print(result)
What will be the output of the above code?
result = sum(my_dict.values())
print(result)
What will be the output of the above code?
a)
1
b)
2
c)
3
d)
6
|
|
Tanuja Mishra answered |
The Python code sums the values of the dictionary "my_dict" (1 + 2 + 3).
Consider the following SQL query:SELECT MAX(salary) FROM employees;
What will be the output of the above query?- a)Maximum salary of all employees in the database
- b)Total salary of all employees in the database
- c)Average salary of all employees in the database
- d)Number of employees in the database
Correct answer is option 'A'. Can you explain this answer?
Consider the following SQL query:
SELECT MAX(salary) FROM employees;
What will be the output of the above query?
What will be the output of the above query?
a)
Maximum salary of all employees in the database
b)
Total salary of all employees in the database
c)
Average salary of all employees in the database
d)
Number of employees in the database
|
Startup Central Classes answered |
The SQL query retrieves the maximum salary value from the "employees" table.
Which of the following code snippets represents an example of a centralized database system architecture?- a)db = Database()
data = db.query("SELECT * FROM customers")
render_data(data) - b)data = query_database("SELECT * FROM customers")
render_data(data) - c)client_code = connect_to_server()
data = client_code.query_database("SELECT * FROM customers") - d)render_data("SELECT * FROM customers")
Correct answer is option 'A'. Can you explain this answer?
Which of the following code snippets represents an example of a centralized database system architecture?
a)
db = Database()
data = db.query("SELECT * FROM customers")
render_data(data)
data = db.query("SELECT * FROM customers")
render_data(data)
b)
data = query_database("SELECT * FROM customers")
render_data(data)
render_data(data)
c)
client_code = connect_to_server()
data = client_code.query_database("SELECT * FROM customers")
data = client_code.query_database("SELECT * FROM customers")
d)
render_data("SELECT * FROM customers")
|
Anil Kumar answered |
The code snippet represents an example of a centralized database system architecture where the database is directly accessed and queried without intermediate layers.
Which of the following is a characteristic of a three-tier architecture?- a)The database is directly accessible by the user interface layer
- b)The business logic is executed on the client-side
- c)The presentation logic is responsible for data validation
- d)Each tier is independent and can be developed separately
Correct answer is option 'D'. Can you explain this answer?
Which of the following is a characteristic of a three-tier architecture?
a)
The database is directly accessible by the user interface layer
b)
The business logic is executed on the client-side
c)
The presentation logic is responsible for data validation
d)
Each tier is independent and can be developed separately
|
Yogesh Dwivedi answered |
In a three-tier architecture, each tier (presentation, application, and database) is independent and can be developed separately. This allows for modularity, flexibility, and ease of maintenance.
Which of the following database system architectures allows multiple clients to access the same database concurrently?- a)Hierarchical architecture
- b)Relational architecture
- c)Client-server architecture
- d)Distributed architecture
Correct answer is option 'C'. Can you explain this answer?
Which of the following database system architectures allows multiple clients to access the same database concurrently?
a)
Hierarchical architecture
b)
Relational architecture
c)
Client-server architecture
d)
Distributed architecture
|
|
Diksha Sharma answered |
In a client-server architecture, multiple clients can access a shared database through a server.
Which of the following code snippets represents an example of a distributed database system architecture?- a)db = Database()
data = db.query("SELECT * FROM customers")
render_data(data) - b)client_code = connect_to_peer()
data = client_code.query_database("SELECT * FROM customers")
render_data(data) - c)client_code = connect_to_server()
data = client_code.query_database("SELECT * FROM customers") - d)render_data("SELECT * FROM customers")
Correct answer is option 'B'. Can you explain this answer?
Which of the following code snippets represents an example of a distributed database system architecture?
a)
db = Database()
data = db.query("SELECT * FROM customers")
render_data(data)
data = db.query("SELECT * FROM customers")
render_data(data)
b)
client_code = connect_to_peer()
data = client_code.query_database("SELECT * FROM customers")
render_data(data)
data = client_code.query_database("SELECT * FROM customers")
render_data(data)
c)
client_code = connect_to_server()
data = client_code.query_database("SELECT * FROM customers")
data = client_code.query_database("SELECT * FROM customers")
d)
render_data("SELECT * FROM customers")
|
Tanuj Arora answered |
The code snippet represents an example of a distributed database system architecture where the client connects to a peer and queries the distributed database.
In a three-tier architecture, which tier is responsible for data storage and retrieval?- a)Presentation tier
- b)Application tier
- c)Database tier
- d)Integration tier
Correct answer is option 'C'. Can you explain this answer?
In a three-tier architecture, which tier is responsible for data storage and retrieval?
a)
Presentation tier
b)
Application tier
c)
Database tier
d)
Integration tier
|
Vikram Singh Baghel answered |
In a three-tier architecture, the database tier is responsible for data storage and retrieval. It manages the physical storage of data and provides mechanisms for querying, updating, and managing the database.
Consider the following SQL code snippet:CREATE TABLE employees (
id INT PRIMARY KEY,
name VARCHAR(50),
age INT
);What will be the result of executing this code?- a)A table named "employees" will be created with three columns
- b)An error will occur because the PRIMARY KEY constraint is missing
- c)An error will occur because the VARCHAR data type is not supported
- d)An error will occur because the table name is already used in the database
Correct answer is option 'A'. Can you explain this answer?
Consider the following SQL code snippet:
CREATE TABLE employees (
id INT PRIMARY KEY,
name VARCHAR(50),
age INT
);
id INT PRIMARY KEY,
name VARCHAR(50),
age INT
);
What will be the result of executing this code?
a)
A table named "employees" will be created with three columns
b)
An error will occur because the PRIMARY KEY constraint is missing
c)
An error will occur because the VARCHAR data type is not supported
d)
An error will occur because the table name is already used in the database
|
CodeNation answered |
The SQL code snippet creates a table named "employees" with three columns: "id" of type INT, "name" of type VARCHAR(50), and "age" of type INT.
Consider the following SQL query:SELECT * FROM customers WHERE age > 30;What does this query retrieve from the "customers" table?- a)All customers with an age greater than 30
- b)All customers with an age less than or equal to 30
- c)All customers with an age exactly equal to 30
- d)All customers with an age between 30 and 40
Correct answer is option 'A'. Can you explain this answer?
Consider the following SQL query:
SELECT * FROM customers WHERE age > 30;
What does this query retrieve from the "customers" table?
a)
All customers with an age greater than 30
b)
All customers with an age less than or equal to 30
c)
All customers with an age exactly equal to 30
d)
All customers with an age between 30 and 40
|
|
CodeNation answered |
The SQL query "SELECT * FROM customers WHERE age > 30;" retrieves all customers from the "customers" table whose age is greater than 30.
Which of the following is true about distributed database systems?- a)All data is stored on a single machine
- b)Data is replicated across all nodes for redundancy
- c)Each node stores a subset of the data
- d)All nodes share a common disk storage
Correct answer is option 'C'. Can you explain this answer?
Which of the following is true about distributed database systems?
a)
All data is stored on a single machine
b)
Data is replicated across all nodes for redundancy
c)
Each node stores a subset of the data
d)
All nodes share a common disk storage
|
Coders Trust answered |
In distributed database systems, data is distributed across multiple nodes, with each node storing a subset of the data.
Which of the following code snippets represents an example of a three-tier architecture?- a)client_code = connect_to_server()
data = client_code.query_database("SELECT * FROM customers")
render_data(data) - b)data = query_database("SELECT * FROM customers")
render_data(data) - c)client_code = connect_to_server()
data = client_code.query_database("SELECT * FROM customers") - d)render_data("SELECT * FROM customers")
Correct answer is option 'A'. Can you explain this answer?
Which of the following code snippets represents an example of a three-tier architecture?
a)
client_code = connect_to_server()
data = client_code.query_database("SELECT * FROM customers")
render_data(data)
data = client_code.query_database("SELECT * FROM customers")
render_data(data)
b)
data = query_database("SELECT * FROM customers")
render_data(data)
render_data(data)
c)
client_code = connect_to_server()
data = client_code.query_database("SELECT * FROM customers")
data = client_code.query_database("SELECT * FROM customers")
d)
render_data("SELECT * FROM customers")
|
|
Anil Kumar answered |
The code snippet represents an example of a three-tier architecture where the client code connects to the server, queries the database, and renders the data.
Which database system architecture allows for the use of stored procedures and triggers?- a)Client-server architecture
- b)Centralized architecture
- c)Peer-to-peer architecture
- d)Distributed architecture
Correct answer is option 'A'. Can you explain this answer?
Which database system architecture allows for the use of stored procedures and triggers?
a)
Client-server architecture
b)
Centralized architecture
c)
Peer-to-peer architecture
d)
Distributed architecture
|
|
CodeNation answered |
The client-server architecture allows for the use of stored procedures and triggers. In this architecture, the database server executes the stored procedures and triggers requested by the client application, providing additional processing capabilities on the server side.
Which of the following best describes a database system architecture?- a)A set of software tools used to manage databases
- b)The physical arrangement of database files on disk
- c)The overall structure that defines how a database system operates
- d)The process of designing tables and relationships in a database
Correct answer is option 'C'. Can you explain this answer?
Which of the following best describes a database system architecture?
a)
A set of software tools used to manage databases
b)
The physical arrangement of database files on disk
c)
The overall structure that defines how a database system operates
d)
The process of designing tables and relationships in a database
|
|
Yogesh Dwivedi answered |
A database system architecture refers to the overall structure and design that defines how a database system operates, including the components, layers, and interactions between them.
Consider the following SQL code snippet:SELECT COUNT(DISTINCT category) FROM products;What does this query retrieve?- a)The number of unique categories in the "products" table
- b)The total number of products in the "products" table
- c)The average count of products in each category
- d)The maximum count of products in a single category
Correct answer is option 'A'. Can you explain this answer?
Consider the following SQL code snippet:
SELECT COUNT(DISTINCT category) FROM products;
What does this query retrieve?
a)
The number of unique categories in the "products" table
b)
The total number of products in the "products" table
c)
The average count of products in each category
d)
The maximum count of products in a single category
|
|
TeamUnknown answered |
The SQL query "SELECT COUNT(DISTINCT category) FROM products;" retrieves the number of unique categories in the "products" table.
(Medium) Which of the following code snippets represents an example of a peer-to-peer database system architecture?- a)db = Database()
data = db.query("SELECT * FROM customers")
render_data(data) - b)client_code = connect_to_peer()
data = client_code.query_database("SELECT * FROM customers")
render_data(data) - c)client_code = connect_to_server()
data = client_code.query_database("SELECT * FROM customers") - d)render_data("SELECT * FROM customers")
Correct answer is option 'B'. Can you explain this answer?
(Medium) Which of the following code snippets represents an example of a peer-to-peer database system architecture?
a)
db = Database()
data = db.query("SELECT * FROM customers")
render_data(data)
data = db.query("SELECT * FROM customers")
render_data(data)
b)
client_code = connect_to_peer()
data = client_code.query_database("SELECT * FROM customers")
render_data(data)
data = client_code.query_database("SELECT * FROM customers")
render_data(data)
c)
client_code = connect_to_server()
data = client_code.query_database("SELECT * FROM customers")
data = client_code.query_database("SELECT * FROM customers")
d)
render_data("SELECT * FROM customers")
|
|
Tanuj Arora answered |
The code snippet represents an example of a peer-to-peer database system architecture where the client connects to a peer and queries the database.
Which of the following code snippets represents an example of a three-tier architecture?- a)db = Database()
data = db.query("SELECT * FROM customers")
render_data(data) - b)client_code = connect_to_peer()
data = client_code.query_database("SELECT * FROM customers")
render_data(data) - c)client_code = connect_to_server()
data = client_code.query_database("SELECT * FROM customers") - d)render_data("SELECT * FROM customers")
Correct answer is option 'C'. Can you explain this answer?
Which of the following code snippets represents an example of a three-tier architecture?
a)
db = Database()
data = db.query("SELECT * FROM customers")
render_data(data)
data = db.query("SELECT * FROM customers")
render_data(data)
b)
client_code = connect_to_peer()
data = client_code.query_database("SELECT * FROM customers")
render_data(data)
data = client_code.query_database("SELECT * FROM customers")
render_data(data)
c)
client_code = connect_to_server()
data = client_code.query_database("SELECT * FROM customers")
data = client_code.query_database("SELECT * FROM customers")
d)
render_data("SELECT * FROM customers")
|
|
Coders Trust answered |
The code snippet represents an example of a three-tier architecture where the client code connects to the server, queries the database, and renders the data.
Consider the following SQL code snippet:INSERT INTO products (id, name, price) VALUES (1, 'Product A', 10);What does this code do?- a)Inserts a new row into the "products" table with specific values
- b)Updates the row with id 1 in the "products" table
- c)Deletes the row with id 1 from the "products" table
- d)Retrieves the row with id 1 from the "products" table
Correct answer is option 'A'. Can you explain this answer?
Consider the following SQL code snippet:
INSERT INTO products (id, name, price) VALUES (1, 'Product A', 10);
What does this code do?
a)
Inserts a new row into the "products" table with specific values
b)
Updates the row with id 1 in the "products" table
c)
Deletes the row with id 1 from the "products" table
d)
Retrieves the row with id 1 from the "products" table
|
|
TeamUnknown answered |
The SQL code snippet inserts a new row into the "products" table with the specified values for the "id," "name," and "price" columns.
Which of the following is an advantage of a distributed database system architecture?- a)Improved data integrity and security
- b)Reduced network traffic and latency
- c)Simplified backup and recovery processes
- d)Higher scalability and availability
Correct answer is option 'D'. Can you explain this answer?
Which of the following is an advantage of a distributed database system architecture?
a)
Improved data integrity and security
b)
Reduced network traffic and latency
c)
Simplified backup and recovery processes
d)
Higher scalability and availability
|
|
Vikram Singh Baghel answered |
One of the advantages of a distributed database system architecture is higher scalability and availability. By distributing data across multiple nodes, it enables parallel processing and improves fault tolerance, allowing for better scalability and availability.
Which of the following is not a primary goal of a database system architecture?- a)Data consistency
- b)Data isolation
- c)Data redundancy
- d)Data integrity
Correct answer is option 'C'. Can you explain this answer?
Which of the following is not a primary goal of a database system architecture?
a)
Data consistency
b)
Data isolation
c)
Data redundancy
d)
Data integrity
|
Tech Era answered |
Database system architectures aim to reduce data redundancy by maintaining data consistency and integrity.
In a parallel database system architecture, data is partitioned across multiple nodes. What is the main advantage of this approach?- a)Increased data security
- b)Improved query performance
- c)Reduced network overhead
- d)Enhanced data scalability
Correct answer is option 'B'. Can you explain this answer?
In a parallel database system architecture, data is partitioned across multiple nodes. What is the main advantage of this approach?
a)
Increased data security
b)
Improved query performance
c)
Reduced network overhead
d)
Enhanced data scalability
|
|
Diksha Sharma answered |
Parallel database systems partition data across multiple nodes, allowing queries to be executed in parallel, thereby improving performance.
Consider the following Python code snippet:def fibonacci(n):
if n <= 1:
return n
else:
return fibonacci(n - 1) + fibonacci(n - 2)result = fibonacci(6)
print(result)What will be the output of the above code?- a)8
- b)9
- c)13
- d)21
Correct answer is option 'A'. Can you explain this answer?
Consider the following Python code snippet:
def fibonacci(n):
if n <= 1:
return n
else:
return fibonacci(n - 1) + fibonacci(n - 2)
if n <= 1:
return n
else:
return fibonacci(n - 1) + fibonacci(n - 2)
result = fibonacci(6)
print(result)
print(result)
What will be the output of the above code?
a)
8
b)
9
c)
13
d)
21
|
|
Tanuja Mishra answered |
The Python code calculates the 6th Fibonacci number (starting from 0).
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Database Management System (DBMS)
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