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All questions of Data Storage and Querying for Software Development Exam
my_list = [1, 2, 3, 4, 5]
print(my_list[3])
What will be the output of the above code?- a)1
- b)2
- c)3
- d)4
Correct answer is option 'A'. Can you explain this answer?
my_list = [1, 2, 3, 4, 5]
print(my_list[3])
What will be the output of the above code?
print(my_list[3])
What will be the output of the above code?
a)
1
b)
2
c)
3
d)
4
|
TeamUnknown answered |
The code prints the element at index 3 in the list my_list, which is 4.
Consider the following B+ tree with order 4:
[10, 20, 30, 40, 50, 60, 70, 80, 90, 100]
What will be the B+ tree after deleting the value 50?- a)[10, 20, 30, 40, 50, 60, 70, 80, 90, 100]
- b)[10, 20, 30, 40, 60, 70, 80, 90, 100]
- c)[10, 20, 30, 40, 60, 70, 80, 90]
- d)[10, 20, 30, 40, 60, 70, 90, 100]
Correct answer is option 'C'. Can you explain this answer?
Consider the following B+ tree with order 4:
[10, 20, 30, 40, 50, 60, 70, 80, 90, 100]
What will be the B+ tree after deleting the value 50?
[10, 20, 30, 40, 50, 60, 70, 80, 90, 100]
What will be the B+ tree after deleting the value 50?
a)
[10, 20, 30, 40, 50, 60, 70, 80, 90, 100]
b)
[10, 20, 30, 40, 60, 70, 80, 90, 100]
c)
[10, 20, 30, 40, 60, 70, 80, 90]
d)
[10, 20, 30, 40, 60, 70, 90, 100]
|
Tanuja Mishra answered |
The value 50 will be deleted from the B+ tree, and the tree will be adjusted accordingly by redistributing keys.
What is the purpose of indexing in a database?- a)To improve data integrity
- b)To ensure data consistency
- c)To facilitate efficient data retrieval
- d)To minimize data redundancy
Correct answer is option 'C'. Can you explain this answer?
What is the purpose of indexing in a database?
a)
To improve data integrity
b)
To ensure data consistency
c)
To facilitate efficient data retrieval
d)
To minimize data redundancy
|
Coders Trust answered |
Indexing helps in improving the efficiency of data retrieval operations by creating a data structure that allows for faster access to the data.
Which of the following is not a query optimization technique used in a DBMS?- a)Indexing
- b)Query rewriting
- c)Query execution plan generation
- d)Query translation
Correct answer is option 'D'. Can you explain this answer?
Which of the following is not a query optimization technique used in a DBMS?
a)
Indexing
b)
Query rewriting
c)
Query execution plan generation
d)
Query translation
|
Neeraj Singh Kushwah answered |
Query translation is not a query optimization technique. It refers to the process of translating a high-level query language into a lower-level query language for execution.
Which of the following data storage models is typically used in a relational database management system (RDBMS)?- a)Object-Oriented model
- b)Hierarchical model
- c)Relational model
- d)NoSQL model
Correct answer is option 'C'. Can you explain this answer?
Which of the following data storage models is typically used in a relational database management system (RDBMS)?
a)
Object-Oriented model
b)
Hierarchical model
c)
Relational model
d)
NoSQL model
|
|
Coders Trust answered |
Relational databases use the relational model to organize and store data.
my_dict = {'name': 'John', 'age': 25}
print(my_dict.get('gender'))
What will be the output of the above code?- a)'John'
- b)25
- c)None
- d)KeyError: 'gender'
Correct answer is option 'C'. Can you explain this answer?
my_dict = {'name': 'John', 'age': 25}
print(my_dict.get('gender'))
What will be the output of the above code?
print(my_dict.get('gender'))
What will be the output of the above code?
a)
'John'
b)
25
c)
None
d)
KeyError: 'gender'
|
Diksha Sharma answered |
The code attempts to retrieve the value associated with the key 'gender' from the dictionary my_dict using the get() method. Since the key does not exist in the dictionary, it returns None.
Consider the following SQL statement:
DELETE FROM employees WHERE department = 'Sales';
What will be the result of this query?- a)All employees in the "Sales" department will be deleted
- b)An error will occur because of incorrect syntax
- c)No result will be returned because of incorrect usage of the DELETE statement
- d)It depends on the existing data in the "employees" table
Correct answer is option 'A'. Can you explain this answer?
Consider the following SQL statement:
DELETE FROM employees WHERE department = 'Sales';
What will be the result of this query?
DELETE FROM employees WHERE department = 'Sales';
What will be the result of this query?
a)
All employees in the "Sales" department will be deleted
b)
An error will occur because of incorrect syntax
c)
No result will be returned because of incorrect usage of the DELETE statement
d)
It depends on the existing data in the "employees" table
|
Yogesh Dwivedi answered |
The DELETE statement will delete all employees from the "employees" table who belong to the "Sales" department based on the condition specified in the WHERE clause.
Consider the following SQL statement:
SELECT DISTINCT department FROM employees;
What will be the result of this query?- a)All distinct departments in the "employees" table
- b)An error will occur because of incorrect usage of the DISTINCT keyword
- c)No result will be returned because of incorrect syntax
- d)It depends on the existing data in the "employees" table
Correct answer is option 'A'. Can you explain this answer?
Consider the following SQL statement:
SELECT DISTINCT department FROM employees;
What will be the result of this query?
SELECT DISTINCT department FROM employees;
What will be the result of this query?
a)
All distinct departments in the "employees" table
b)
An error will occur because of incorrect usage of the DISTINCT keyword
c)
No result will be returned because of incorrect syntax
d)
It depends on the existing data in the "employees" table
|
Vikram Singh Baghel answered |
The DISTINCT keyword is used to retrieve only distinct values of a column in the query result.
employees = [
{'name': 'John', 'age': 25, 'department': 'Sales'},
{'name': 'Emma', 'age': 30, 'department': 'HR'},
{'name': 'Mike', 'age': 35, 'department': 'IT'}
]department_names = [employee['department'] for employee in employees]
department_set = set(department_names)print(len(department_set))
What will be the output of the above code?- a)1
- b)2
- c)3
- d)Error: 'list' object has no attribute 'department'
Correct answer is option 'C'. Can you explain this answer?
employees = [
{'name': 'John', 'age': 25, 'department': 'Sales'},
{'name': 'Emma', 'age': 30, 'department': 'HR'},
{'name': 'Mike', 'age': 35, 'department': 'IT'}
]
{'name': 'John', 'age': 25, 'department': 'Sales'},
{'name': 'Emma', 'age': 30, 'department': 'HR'},
{'name': 'Mike', 'age': 35, 'department': 'IT'}
]
department_names = [employee['department'] for employee in employees]
department_set = set(department_names)
department_set = set(department_names)
print(len(department_set))
What will be the output of the above code?
What will be the output of the above code?
a)
1
b)
2
c)
3
d)
Error: 'list' object has no attribute 'department'
|
Code Nation answered |
The code creates a list of department names by extracting the 'department' value from each employee dictionary in the employees list. The department names are then converted into a set to eliminate duplicates. The length of the set department_set is 3.
class Student:
def __init__(self, name, roll_number):
self.name = name
self.roll_number = roll_numberstudents = [Student('John', 1), Student('Emma', 2), Student('Mike', 3)]
student_dict = {student.roll_number: student for student in students}print(student_dict[2].name)
What will be the output of the above code?- a)'John'
- b)'Emma'
- c)'Mike'
- d)2
Correct answer is option 'B'. Can you explain this answer?
class Student:
def __init__(self, name, roll_number):
self.name = name
self.roll_number = roll_number
def __init__(self, name, roll_number):
self.name = name
self.roll_number = roll_number
students = [Student('John', 1), Student('Emma', 2), Student('Mike', 3)]
student_dict = {student.roll_number: student for student in students}
student_dict = {student.roll_number: student for student in students}
print(student_dict[2].name)
What will be the output of the above code?
What will be the output of the above code?
a)
'John'
b)
'Emma'
c)
'Mike'
d)
2
|
Sanjana Chavan answered |
Output:
The output of the above code will be "Emma".
Explanation:
1. First, we define a class called "Student" with two attributes: name and roll_number. The class has an __init__ method that initializes these attributes.
2. Then, we create a list called "students" and populate it with three instances of the Student class, each with a different name and roll number.
3. Next, we create a dictionary called "student_dict" using a dictionary comprehension. The key of each item in the dictionary is the roll number of the student, and the value is the corresponding student instance.
4. Finally, we print the name of the student with a roll number of 2 from the "student_dict" dictionary. Since the value associated with the key 2 is the student instance with the name "Emma", the output will be "Emma".
Key Points:
- The code defines a Student class with two attributes: name and roll_number.
- The code creates a list of Student instances and populates it with three students.
- The code creates a dictionary using a dictionary comprehension, where the roll number is the key and the student instance is the value.
- The code prints the name of the student with a roll number of 2 from the dictionary.
The output of the above code will be "Emma".
Explanation:
1. First, we define a class called "Student" with two attributes: name and roll_number. The class has an __init__ method that initializes these attributes.
2. Then, we create a list called "students" and populate it with three instances of the Student class, each with a different name and roll number.
3. Next, we create a dictionary called "student_dict" using a dictionary comprehension. The key of each item in the dictionary is the roll number of the student, and the value is the corresponding student instance.
4. Finally, we print the name of the student with a roll number of 2 from the "student_dict" dictionary. Since the value associated with the key 2 is the student instance with the name "Emma", the output will be "Emma".
Key Points:
- The code defines a Student class with two attributes: name and roll_number.
- The code creates a list of Student instances and populates it with three students.
- The code creates a dictionary using a dictionary comprehension, where the roll number is the key and the student instance is the value.
- The code prints the name of the student with a roll number of 2 from the dictionary.
Consider the following SQL statement:
SELECT * FROM employees WHERE salary > 50000;
What will be the result of this query?- a)All employees with a salary greater than 50000
- b)All employees with a salary less than or equal to 50000
- c)An error will occur because of incorrect syntax
- d)No result will be returned because of incorrect usage of the WHERE clause
Correct answer is option 'A'. Can you explain this answer?
Consider the following SQL statement:
SELECT * FROM employees WHERE salary > 50000;
What will be the result of this query?
SELECT * FROM employees WHERE salary > 50000;
What will be the result of this query?
a)
All employees with a salary greater than 50000
b)
All employees with a salary less than or equal to 50000
c)
An error will occur because of incorrect syntax
d)
No result will be returned because of incorrect usage of the WHERE clause
|
Startup Central Classes answered |
The query will return all employees with a salary greater than 50000 based on the condition specified in the WHERE clause.
In a hash table, collisions can occur when two different keys hash to the same:- a)index
- b)bucket
- c)block
- d)address
Correct answer is option 'B'. Can you explain this answer?
In a hash table, collisions can occur when two different keys hash to the same:
a)
index
b)
bucket
c)
block
d)
address
|
|
TeamUnknown answered |
In a hash table, collisions occur when two different keys hash to the same bucket. A bucket is a container that holds elements with the same hash value.
Consider the following B+ tree with order 3:
[12, 15, 21, 24, 30, 34, 38, 41, 44, 49]
What will be the B+ tree after inserting the value 27?- a)[12, 15, 21, 24, 27, 30, 34, 38, 41, 44, 49]
- b)[12, 15, 21, 24, 27, 30, 34, 38, 41, 44, 49, 27]
- c)[12, 15, 21, 24, 30, 27, 34, 38, 41, 44, 49]
- d)[12, 15, 21, 24, 30, 34, 38, 41, 44, 49, 27]
Correct answer is option 'C'. Can you explain this answer?
Consider the following B+ tree with order 3:
[12, 15, 21, 24, 30, 34, 38, 41, 44, 49]
What will be the B+ tree after inserting the value 27?
[12, 15, 21, 24, 30, 34, 38, 41, 44, 49]
What will be the B+ tree after inserting the value 27?
a)
[12, 15, 21, 24, 27, 30, 34, 38, 41, 44, 49]
b)
[12, 15, 21, 24, 27, 30, 34, 38, 41, 44, 49, 27]
c)
[12, 15, 21, 24, 30, 27, 34, 38, 41, 44, 49]
d)
[12, 15, 21, 24, 30, 34, 38, 41, 44, 49, 27]
|
|
Tanuja Mishra answered |
In a B+ tree, the value 27 will be inserted as a leaf node between 24 and 30.
Consider the following SQL statement:
SELECT MAX(salary) FROM employees;
What will be the result of this query?- a)The maximum salary in the "employees" table
- b)The average salary in the "employees" table
- c)An error will occur because of incorrect usage of the MAX function
- d)No result will be returned because of incorrect syntax
Correct answer is option 'A'. Can you explain this answer?
Consider the following SQL statement:
SELECT MAX(salary) FROM employees;
What will be the result of this query?
SELECT MAX(salary) FROM employees;
What will be the result of this query?
a)
The maximum salary in the "employees" table
b)
The average salary in the "employees" table
c)
An error will occur because of incorrect usage of the MAX function
d)
No result will be returned because of incorrect syntax
|
KnowIT answered |
The MAX function returns the maximum value of the specified column, which in this case is the "salary" column in the "employees" table.
def hash_function(key):
return key % 5hash_table = [[] for _ in range(5)]
keys = [15, 7, 22, 3, 12]for key in keys:
index = hash_function(key)
hash_table[index].append(key)print(hash_table)
What will be the output of the above code?- a)[[], [], [3], [], [7, 12, 22, 15]]
- b)[[], [3, 12], [22], [7], [15]]
- c)[[], [7], [22], [3], [12, 15]]
- d)[[], [15, 7, 22, 3, 12], [], [], []]
Correct answer is option 'A'. Can you explain this answer?
def hash_function(key):
return key % 5
return key % 5
hash_table = [[] for _ in range(5)]
keys = [15, 7, 22, 3, 12]
keys = [15, 7, 22, 3, 12]
for key in keys:
index = hash_function(key)
hash_table[index].append(key)
index = hash_function(key)
hash_table[index].append(key)
print(hash_table)
What will be the output of the above code?
What will be the output of the above code?
a)
[[], [], [3], [], [7, 12, 22, 15]]
b)
[[], [3, 12], [22], [7], [15]]
c)
[[], [7], [22], [3], [12, 15]]
d)
[[], [15, 7, 22, 3, 12], [], [], []]
|
|
Neeraj Singh Kushwah answered |
The code demonstrates hash table implementation using a hash function that performs modulo division. Each key from the keys list is hashed, and the resulting index is used to append the key to the corresponding bucket in the hash_table.
Consider the following SQL statement:
INSERT INTO customers (name, age) VALUES ('John', 25);
How many rows will be affected by this query?- a)0
- b)1
- c)An error will occur because of incorrect syntax
- d)It depends on the existing data in the "customers" table
Correct answer is option 'B'. Can you explain this answer?
Consider the following SQL statement:
INSERT INTO customers (name, age) VALUES ('John', 25);
How many rows will be affected by this query?
INSERT INTO customers (name, age) VALUES ('John', 25);
How many rows will be affected by this query?
a)
0
b)
1
c)
An error will occur because of incorrect syntax
d)
It depends on the existing data in the "customers" table
|
|
Yogesh Dwivedi answered |
The INSERT statement inserts a new row into the "customers" table, affecting one row.
Which of the following is NOT a data storage device?- a)Hard Disk Drive (HDD)
- b)Solid-State Drive (SSD)
- c)Random Access Memory (RAM)
- d)Central Processing Unit (CPU)
Correct answer is option 'D'. Can you explain this answer?
Which of the following is NOT a data storage device?
a)
Hard Disk Drive (HDD)
b)
Solid-State Drive (SSD)
c)
Random Access Memory (RAM)
d)
Central Processing Unit (CPU)
|
Ritesh Kumar Shivhare answered |
The CPU is not a data storage device. It is the primary component responsible for executing instructions and performing calculations in a computer system.
my_tuple = (1, 2, 3)
print(my_tuple[1:])
What will be the output of the above code?- a)(1, 2, 3)
- b)(1,)
- c)(2, 3)
- d)(2,)
Correct answer is option 'C'. Can you explain this answer?
my_tuple = (1, 2, 3)
print(my_tuple[1:])
What will be the output of the above code?
print(my_tuple[1:])
What will be the output of the above code?
a)
(1, 2, 3)
b)
(1,)
c)
(2, 3)
d)
(2,)
|
Tanuj Arora answered |
The code prints a slice of the tuple my_tuple starting from index 1. The slice [1:] includes all elements from index 1 to the end, resulting in (2, 3).
Which of the following operations is performed during the Query Processing phase in a DBMS?- a)Data insertion
- b)Data deletion
- c)Data retrieval
- d)Data modification
Correct answer is option 'C'. Can you explain this answer?
Which of the following operations is performed during the Query Processing phase in a DBMS?
a)
Data insertion
b)
Data deletion
c)
Data retrieval
d)
Data modification
|
|
Neeraj Singh Kushwah answered |
Query Processing involves various steps, including query parsing, query optimization, and query execution. Data retrieval is one of the operations performed during the query execution phase.
Which of the following is true about primary memory in a computer system?- a)It is non-volatile and provides long-term data storage.
- b)It is volatile and provides short-term data storage.
- c)It is non-volatile and provides short-term data storage.
- d)It is volatile and provides long-term data storage.
Correct answer is option 'B'. Can you explain this answer?
Which of the following is true about primary memory in a computer system?
a)
It is non-volatile and provides long-term data storage.
b)
It is volatile and provides short-term data storage.
c)
It is non-volatile and provides short-term data storage.
d)
It is volatile and provides long-term data storage.
|
|
Ritesh Kumar Shivhare answered |
Primary memory, also known as main memory or RAM, is volatile and provides temporary storage for data and program instructions.
my_string = "Hello, World!"
print(my_string.lower())
What will be the output of the above code?- a)"hello, world!"
- b)"Hello, World!"
- c)"HELLO, WORLD!"
- d)"H"
Correct answer is option 'A'. Can you explain this answer?
my_string = "Hello, World!"
print(my_string.lower())
What will be the output of the above code?
print(my_string.lower())
What will be the output of the above code?
a)
"hello, world!"
b)
"Hello, World!"
c)
"HELLO, WORLD!"
d)
"H"
|
|
Tanuj Arora answered |
The lower() method is used to convert all characters in a string to lowercase. The code converts the string my_string to lowercase, resulting in "hello, world!".
In the context of a database, what does ACID stand for?- a)Atomicity, Consistency, Isolation, Durability
- b)Access, Consistency, Integrity, Durability
- c)Atomicity, Concurrency, Inheritance, Durability
- d)Access, Concurrency, Integrity, Durability
Correct answer is option 'A'. Can you explain this answer?
In the context of a database, what does ACID stand for?
a)
Atomicity, Consistency, Isolation, Durability
b)
Access, Consistency, Integrity, Durability
c)
Atomicity, Concurrency, Inheritance, Durability
d)
Access, Concurrency, Integrity, Durability
|
|
Startup Central Classes answered |
ACID is an acronym for the properties guaranteed by a transaction in a database system: Atomicity, Consistency, Isolation, and Durability.
Which of the following SQL statements is used to add a new column called "age" of type INTEGER to an existing table called "students"?- a)ALTER TABLE students ADD COLUMN age INTEGER;
- b)ADD COLUMN age INTEGER TO students;
- c)UPDATE TABLE students ADD age INTEGER;
- d)ALTER students ADD age INTEGER;
Correct answer is option 'A'. Can you explain this answer?
Which of the following SQL statements is used to add a new column called "age" of type INTEGER to an existing table called "students"?
a)
ALTER TABLE students ADD COLUMN age INTEGER;
b)
ADD COLUMN age INTEGER TO students;
c)
UPDATE TABLE students ADD age INTEGER;
d)
ALTER students ADD age INTEGER;
|
|
Code Nation answered |
The ALTER TABLE statement is used to add a new column to an existing table in SQL.
What is the purpose of indexing in a database management system?- a)To ensure data integrity and consistency.
- b)To provide a backup mechanism for data.
- c)To improve data storage efficiency and retrieval speed.
- d)To enforce security and access control on data.
Correct answer is option 'C'. Can you explain this answer?
What is the purpose of indexing in a database management system?
a)
To ensure data integrity and consistency.
b)
To provide a backup mechanism for data.
c)
To improve data storage efficiency and retrieval speed.
d)
To enforce security and access control on data.
|
|
TeamUnknown answered |
Indexing in a database management system is used to improve data storage efficiency and retrieval speed by creating a separate data structure that enables faster searching and access to specific data.
class Database:
def __init__(self):
self.data = [] def insert(self, value):
self.data.append(value) def search(self, value):
return value in self.datadb = Database()
db.insert(10)
db.insert(20)
db.insert(30)print(db.search(20))
What will be the output of the above code?- a)True
- b)False
- c)Error: 'Database' object has no attribute 'search'
- d)Error: 'Database' object has no attribute 'insert'
Correct answer is option 'A'. Can you explain this answer?
class Database:
def __init__(self):
self.data = []
def __init__(self):
self.data = []
def insert(self, value):
self.data.append(value)
self.data.append(value)
def search(self, value):
return value in self.data
return value in self.data
db = Database()
db.insert(10)
db.insert(20)
db.insert(30)
db.insert(10)
db.insert(20)
db.insert(30)
print(db.search(20))
What will be the output of the above code?
What will be the output of the above code?
a)
True
b)
False
c)
Error: 'Database' object has no attribute 'search'
d)
Error: 'Database' object has no attribute 'insert'
|
|
Startup Central Classes answered |
The code defines a Database class with insert() and search() methods. An instance of the class db is created, and values are inserted into the data list using the insert() method. The search() method is then used to check if the value 20 exists in the data list, returning True.
Consider the following SQL statement:
SELECT * FROM employees WHERE salary BETWEEN 30000 AND 50000;
What will be the result of this query?- a)All employees with a salary between 30000 and 50000
- b)An error will occur because of incorrect syntax
- c)No result will be returned because of incorrect usage of the WHERE clause
- d)It depends on the existing data in the "employees" table
Correct answer is option 'A'. Can you explain this answer?
Consider the following SQL statement:
SELECT * FROM employees WHERE salary BETWEEN 30000 AND 50000;
What will be the result of this query?
SELECT * FROM employees WHERE salary BETWEEN 30000 AND 50000;
What will be the result of this query?
a)
All employees with a salary between 30000 and 50000
b)
An error will occur because of incorrect syntax
c)
No result will be returned because of incorrect usage of the WHERE clause
d)
It depends on the existing data in the "employees" table
|
|
Vikram Singh Baghel answered |
The BETWEEN operator is used to retrieve rows where a value lies within a specified range.
my_set = {1, 2, 3, 4, 5}
my_set.add(3)
print(len(my_set))
What will be the output of the above code?- a)4
- b)5
- c)6
- d)Error: 'set' object has no attribute 'add'
Correct answer is option 'A'. Can you explain this answer?
my_set = {1, 2, 3, 4, 5}
my_set.add(3)
print(len(my_set))
What will be the output of the above code?
my_set.add(3)
print(len(my_set))
What will be the output of the above code?
a)
4
b)
5
c)
6
d)
Error: 'set' object has no attribute 'add'
|
|
Diksha Sharma answered |
The code adds the value 3 to the set my_set. However, since sets only store unique elements, the duplicate value is not added. Therefore, the length of my_set remains 4.
Consider the following SQL statement:
SELECT COUNT(*) FROM orders;
What will be the result of this query?- a)The total number of rows in the "orders" table
- b)The number of distinct values in the "orders" table
- c)An error will occur because of incorrect usage of the COUNT function
- d)No result will be returned because of incorrect syntax
Correct answer is option 'A'. Can you explain this answer?
Consider the following SQL statement:
SELECT COUNT(*) FROM orders;
What will be the result of this query?
SELECT COUNT(*) FROM orders;
What will be the result of this query?
a)
The total number of rows in the "orders" table
b)
The number of distinct values in the "orders" table
c)
An error will occur because of incorrect usage of the COUNT function
d)
No result will be returned because of incorrect syntax
|
|
Code Nation answered |
The COUNT(*) function returns the total number of rows in the specified table.
import hashlibdef hash_string(s):
return hashlib.md5(s.encode()).hexdigest()hash_table = [[] for _ in range(5)]
keys = ['apple', 'banana', 'cherry', 'date']for key in keys:
index = int(hash_string(key), 16) % 5
hash_table[index].append(key)print(hash_table)
What will be the output of the above code?- a)[[], ['apple'], [], ['banana'], ['cherry', 'date']]
- b)[[], ['apple', 'cherry'], ['banana'], [], ['date']]
- c)[['banana', 'cherry'], [], [], ['apple'], ['date']]
- d)[['banana'], ['cherry'], ['date'], ['apple'], []]
Correct answer is option 'C'. Can you explain this answer?
import hashlib
def hash_string(s):
return hashlib.md5(s.encode()).hexdigest()
return hashlib.md5(s.encode()).hexdigest()
hash_table = [[] for _ in range(5)]
keys = ['apple', 'banana', 'cherry', 'date']
keys = ['apple', 'banana', 'cherry', 'date']
for key in keys:
index = int(hash_string(key), 16) % 5
hash_table[index].append(key)
index = int(hash_string(key), 16) % 5
hash_table[index].append(key)
print(hash_table)
What will be the output of the above code?
What will be the output of the above code?
a)
[[], ['apple'], [], ['banana'], ['cherry', 'date']]
b)
[[], ['apple', 'cherry'], ['banana'], [], ['date']]
c)
[['banana', 'cherry'], [], [], ['apple'], ['date']]
d)
[['banana'], ['cherry'], ['date'], ['apple'], []]
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Startup Central Classes answered |
The code demonstrates hash table implementation using the MD5 hashing algorithm. The hash_string() function converts a string into its MD5 hash. The keys from the keys list are hashed, and the resulting hash values are converted to integers and used as indices to append the keys to the appropriate buckets in the hash_table.
Which of the following indexing techniques is commonly used for fast searching in a database?- a)B-tree indexing
- b)Sequential indexing
- c)Linear indexing
- d)Hash indexing
Correct answer is option 'A'. Can you explain this answer?
Which of the following indexing techniques is commonly used for fast searching in a database?
a)
B-tree indexing
b)
Sequential indexing
c)
Linear indexing
d)
Hash indexing
|
|
TeamUnknown answered |
B-tree indexing is commonly used for fast searching in a database. It organizes data in a balanced tree structure, allowing efficient retrieval based on the indexed key values.
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Database Management System (DBMS)
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