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Most asked SQL Interview Questions

1. Explain order of execution of SQL.
2. What is difference between where and having?
3. What is the use of group by?
4. Explain all types of joins in SQL?
5. What are triggers in SQL?
6. What is stored procedure in SQL
7. Explain all types of window functions?
(Mainly rank, row_num, dense_rank, lead & lag)
8. What is the difference between DROP vs DELETE vs TRUNCATE?
9. What is difference between DML, DDL and DCL?
10. Which is faster between CTE and Subquery?
11. What are constraints and types of Constraints?
12. What is normalization?
13. Difference between Group By and Where Clause?
14. Explain View concepts ?
15. What are different types of constraints?
16. Difference between char and Varchar?
17. What is an index? Explain its different types.
18. Write an SQL query to find the names of employees starting with ‘A’.
19. How many types of clauses in SQL?
26. Difference between UNION and UNION ALL in SQL?
27. What are the various types of relationships in SQL?
28. Difference between Primary Key and Foreign Key?
29. What is the difference between where and having?
30. Find the second highest salary of an employee?
31. Difference between Function and Store procedure ?
32. How would you optimize a slow SQL query?
33. Difference between INNER JOIN and OUTER JOIN?
34. How do you handle duplicate rows in a SQL query?
35. Write a SQL query to find the top 3 departments with the highest average salary.
36. Write a SQL query to find the employees who have the same name and work in the same department.
37. Write a SQL query to find the departments with no employees.
38. How do you use indexing to improve SQL query performance?
39. Write a SQL query to find the employees who have worked for more than 5 years.
40. What is the difference between SUBQUERY and JOIN?
41. Write a SQL query to find the top 2 products with the highest sales.
42. How do you use stored procedures to improve SQL query performance?
43. Write a SQL query to find the customers who have placed an order but have not made a payment.
44. Write a SQL query to find the employees who work in the same department as their manager.
45. How do you use window functions to solve complex queries?
46. Write a SQL query to find the top 3 products with the highest average price.
47. Write a SQL query to find the employees who have not taken any leave in the last 6 months.
48. Write down various types of relationships in SQL?
49. What is the difference between Cluster and Non-Cluster Index?
50. Why do we use Commit and Rollback commands?
51. What are indexes in SQL?
52. What are aggregate functions? Can you name a few?

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globallogic recent interview question

📌 Round 1 : ( Technical )

👉 Write a Java program to reverse first and last digit of number without converting it into a string.
👉 Difference between an interface and an abstract class in Java.
👉 Design patterns such as Singleton or Factory in your automation framework?
👉 Difference between HashMap and TreeMap in Java? Give example.
👉 Difference between Assert and Verify in Selenium?
👉 Thread.sleep() vs WebDriverWait in Selenium?
👉 Write Selenium code to handle file download from the browser.
👉 Steps would you take if an element is not interactable in Selenium?
👉 Difference between Alpha testing and Beta testing ? Give examples.
👉 Describe a difficult bug you discovered in your testing and how you resolved it. ? Give example

📌 Round 2 : ( Techno-managerial round )
👉 Explain the key components of the test automation framework you worked on?
👉 Can you write selenium code to zoom in on a webpage ?
👉 Can you perform a mouse hover action on an element using Selenium?
👉 Can you write Selenium code to capture a screenshot with a custom file name. Write code
👉 Write a Selenium code to handle file uploads .
👉 Challenges you faced while running tests on multiple browsers at the same time using Selenium Grid?
👉 What are the key challenges you have faced in testing in the dynamic websites ? Give some practical scenarios.
👉 Role of feature files in Cucumber BDD
👉 Static binding and dynamic binding in Java ? Give some practical examples.
👉 Differences between a requirement and a user story in Agile methodology ?
👉 What is Jenkins CRON expression ? How would you configure Jenkins to run automated tests after every commit ?

📌 Round 3 : ( HR )
👉 What is your expected ctc ?
👉 Can you relocate if required ?
👉 Joining date discussion.

Contributed by : Ajay , 6+ years of experience.

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🚀 Key Python Topics Every Developer Should Know! 🚀

Python has become one of the most popular programming languages due to its versatility and ease of learning. Whether you're just starting out or refining your skills, here are some must-know topics in Python, along with examples to get you started! 💻🐍

1️⃣ Data Structures
Mastering lists, dictionaries, sets, and tuples can make data handling efficient.

python
Copy code
# Example: Using a dictionary to store user data
user_data = {"name": "Alex", "age": 30, "location": "NYC"}
print(user_data["name"]) # Output: Alex
2️⃣ Object-Oriented Programming (OOP)
OOP is key for building scalable applications, organizing code with classes, and implementing inheritance and polymorphism.

python
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# Example: Basic class structure
class Dog:
def init(self, name):
self.name = name

def bark(self):
return f"{self.name} says Woof!"

dog = Dog("Buddy")
print(dog.bark()) # Output: Buddy says Woof!
3️⃣ Error Handling
Using try and except blocks allows you to catch and handle errors, making your code robust.

python
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# Example: Handling a potential error
try:
result = 10 / 0
except ZeroDivisionError:
print("You can't divide by zero!")
4️⃣ File Handling
Reading and writing files is essential for data storage and processing.

python
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# Example: Writing to a file
with open("sample.txt", "w") as file:
file.write("Hello, Python!")
5️⃣ Libraries & Modules
Python has libraries for everything! From data science (pandas, numpy) to web development (Flask, Django).

python
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# Example: Importing and using a library
import math
print(math.sqrt(16)) # Output: 4.0
6️⃣ Lambda & List Comprehensions
These techniques can make your code more concise and efficient.

python
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# Example: List comprehension
squares = [x**2 for x in range(5)]
print(squares) # Output: [0, 1, 4, 9, 16]
Whether you're coding for web development, data analysis, or AI, Python has you covered! 🐍💼 What are your favorite Python topics? Drop them in the comments! 👇

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React interview questions answers 🤔

Problem solving questions days 1

1. Build Strong IT Fundamentals
Networking: Learn how data moves across the internet. Understand TCP/IP, DNS, HTTP/HTTPS, VPNs.
Certifications: CompTIA Network+.
Operating Systems: Focus on Linux (Kali, Ubuntu) and Windows. Learn to use the command line and basic system administration.
Programming/Scripting: Start with Python or Bash, which are critical for automating tasks and penetration testing.
Certifications: CompTIA A+.

2. Learn Cybersecurity Basics
Cybersecurity Principles: Study vulnerabilities, attacks, cryptography, and encryption methods.
Topics: Threats (e.g., malware, phishing), firewalls, IDS/IPS, SSL/TLS.
Tools: Wireshark, Nmap, Metasploit.
Ethical Hacking: Understand the hacker mindset to learn how to protect systems.
Certifications: CompTIA Security+ (great for beginners).

3. Dive Deeper into Core Cybersecurity Areas
Network Security: Firewalls, VPNs, IDS/IPS systems.
Application Security: Secure software development, OWASP Top 10 vulnerabilities.
Cloud Security: Learn how cloud services (AWS, Azure) handle security. Cloud security is in demand.
Penetration Testing: Learn how to ethically exploit vulnerabilities. Use tools like Metasploit and Burp Suite.
Incident Response & Forensics: Learn how to analyze and respond to breaches.

4. Hands-On Practice and Tools
CTF Challenges: Use platforms like Hack The Box, TryHackMe to practice your skills in real-world scenarios.
Labs: Set up virtual machines (VMs) and networks to practice penetration testing and system hardening.
Bug Bounty Programs: Join platforms like HackerOne or Bugcrowd to find real-world vulnerabilities.

5. Specialize and Get Certified
Choose a cybersecurity focus:

Penetration Testing: Go deeper with OSCP (Offensive Security Certified Professional).
Cloud Security: AWS Certified Security, Azure Security Engineer.
Incident Response: GCIH (Certified Incident Handler).
Governance, Risk & Compliance (GRC): CISM, CISSP.

6. Continuous Learning and Building a Portfolio
Certifications: Continue with advanced ones like CISSP, CEH, or CySA+.
Stay Updated: Follow security news, attend conferences (e.g., DEFCON), read blogs like KrebsOnSecurity.
Build a Portfolio: Contribute to GitHub, document your CTF solutions, or write a security blog to showcase your skills.

Cybersecurity Learning Roadmap: A Step-by-Step Guide to Building Expertise