Coding_knowledge

Hey folks, if you’re failing SQL interviews again and again, then memorize these 50 SQL interview questions and answers—you’ll clear your SQL interview in no time 👇 https://www.linkedin.com/posts/harish-bhatt-449ab2264_most-asked-sql-interview-queries-in-maang-activity-7417792076043587584-uYIE?utm_source=share&utm_medium=member_desktop&rcm=ACoAAEDyQvkBZoHj8lu2sM00x1Dhc54Sh0qPmOA

Stanford, Harvard University, IBM, Google, and EXD have just launched their free courses 👇 1. Introduction to Object-Oriented Programming with Java by EdX : https://www.edx.org/certificates/professional-certificate/gtx-introduction-to-object-oriented-programming-with-java?index=product&queryId=cd2869d4235c6413b7294e3a302b04d4&position=1 2. Machine Learning by Stanford : https://online.stanford.edu/courses/cs229-machine-learning 3. Introduction to Computer Science by Harvard University : https://pll.harvard.edu/course/cs50-introduction-computer-science 4. Python for Data Science by IBM : https://www.coursera.org/learn/python-for-applied-data-science-ai 5. Fundamentals of Digital Marketing by Google : https://skillshop.exceedlms.com/student/collection/1384851-fundamentals-of-digital-marketing

🧩 Core Computer Science Concepts 🧠 Big-O Notation 🗂️ Data Structures 🔁 Recursion 🧵 Concurrency vs Parallelism 📦 Memory Management 🔒 Race Conditions 🌐 Networking Basics ⚙️ Operating Systems 🧪 Testing Strategies 📐 System Design React ❤️ for more like this

Websites I wish I knew about before graduating 🥲 1. DORA : This website lets you create animated apps and sites in seconds https://www.dora.run/ 2. Chatgpt study : Turns your ChatGPT into an actual tutor that can test you in real time https://openai.com/index/chatgpt-study-mode/ 3. docsity : Gives you free access to past papers, exams just by entering your university https://www.docsity.com/en/ 4. chatpdf : Lets you upload your documents so you can chat and question the different sections https://www.chatpdf.com/ 5. paper panda : This website can legit gives you access to any paper or article you can’t access https://paperpanda.app/ 6. Paperpal: You can paste your entire essay in here and it edits it like a top students https://paperpal.com 7. flow: This website lets you create an entire animated movie using AI https://labs.google/flow/about

✅ Data Science Mistakes Beginners Should Avoid ⚠️📉 1️⃣ Skipping the Basics • Jumping into ML without Python, Stats, or Pandas ✅ Build strong foundations in math, programming & EDA first 2️⃣ Not Understanding the Problem • Applying models blindly • Irrelevant features and metrics ✅ Always clarify business goals before coding 3️⃣ Treating Data Cleaning as Optional • Training on dirty/incomplete data ✅ Spend time on preprocessing — it’s 70% of real work 4️⃣ Using Complex Models Too Early • Overfitting small datasets • Ignoring simpler, interpretable models ✅ Start with baseline models (Logistic Regression, Decision Trees) 5️⃣ No Evaluation Strategy • Relying only on accuracy ✅ Use proper metrics (F1, AUC, MAE) based on problem type 6️⃣ Not Visualizing Data • Missed outliers and patterns ✅ Use Seaborn, Matplotlib, Plotly for EDA 7️⃣ Poor Feature Engineering • Feeding raw data into models ✅ Create meaningful features that boost performance 8️⃣ Ignoring Domain Knowledge • Features don’t align with real-world logic ✅ Talk to stakeholders or do research before modeling 9️⃣ No Practice with Real Datasets • Kaggle-only learning ✅ Work with messy, real-world data (open data portals, APIs) 🔟 Not Documenting or Sharing Work • No GitHub, no portfolio ✅ Document notebooks, write blogs, push projects online 💬 Tap ❤️ for more!

Want to learn Git? Here’s the complete roadmap 👇 https://www.linkedin.com/posts/harish-bhatt-449ab2264_git-roadmap-for-beginners-advanced-developers-activity-7415609753608876032-alkQ?utm_source=share&utm_medium=member_desktop&rcm=ACoAAEDyQvkBZoHj8lu2sM00x1Dhc54Sh0qPmOA

I really wish my seniors told me about these websites before my final year 👇 1/ NotebookLM: Upload your study notes or articles and instantly turn them into podcasts. https://notebooklm.google/ 2/ Writefull: Specially trained on journals to improve your academic writing and works seamlessly with Overleaf & Word. https://www.writefull.com/ 3/ Undetectable AI: Upload your study notes and get text that sounds natural and authentic. https://undetectable.ai/?dv=ca&peoc=true 4/ PDF Drive: Access all the books and articles you need for school or college in one place. https://pdfdrive.com.co/ 5/ Writefull: Specially trained on journals to improve your academic writing - and works seamlessly with Overleaf & Word. https://mapify.so/

⚠️ Data Analysts Without AI Skills Will Be Outdated in 2026 📊 Become an AI-Driven Data Analyst 🎓 LearnTube Certified | Google-Backed 📘 Skills Companies Pay For: Python • AI Analytics • Big Data • Power BI 🎓 You’ll Get: ✔️ 12+ Expert-Led Lessons ✔️ 4 Real Industry Projects ✔️ 1 Professional Certificate ✔️ Lifetime Access + Career Support 💼 Career Opportunities: 📊 AI Data Analyst 🤖 Machine Learning Analyst ☁️ Big Data & Cloud Analyst 👇 Upgrade your income now https://tinyurl.com/AIInDataAnalyticsXCoCK2

7 Days = 7 Certificates 🎯 1/ Google Certifications: https://developers.google.com/certification 2/ PayPal (Technical Compliance / PCI): https://www.paypal.com/in/webapps/mpp/pci-compliance 3/ Deloitte Academy (Learning & Certifications): https://www.deloitte.com/cy/en/services/deloitte-academy.html 4/ Oracle Certifications: https://academy.oracle.com/en/resources-oracle-certifications.html 5/ IBM Certifications: https://www.pearsonvue.com/us/en/ibm.html 6/ Meta Certifications: https://www.facebook.com/business/learn/certification 7/ Microsoft: https://learn.microsoft.com/en-us/shows/intro-to-python-development/

Only 2 hours are left ⏰ If you haven’t enrolled yet to learn Python for free with real-world projects 💻, do it now! We’ll be going live after 2 hours ✨ And If you want 🎁Free Goodies + Free Certificate + Project Files + Live Q&A 🔗, then choose "Maharashtra" as your state. Register Now For Free 😍👇 :- https://forms.gle/Zds1xFFes33BBQvD8

Only 50 seats are left ⏳ If you haven’t enrolled for free yet, do it now 🚀 Otherwise, you’ll miss the chance to learn Python from basic to advanced level for free, along with real-world projects 💻📘 And If you want 🎁Free Goodies + Free Certificate + Project Files + Live Q&A 🔗, then choose "Maharashtra" as your state. Register Now For Free 😍 :- https://forms.gle/Zds1xFFes33BBQvD8

✅ Python Coding Interview Questions – Part 11 🐍💻 1️⃣ Q: Return the first duplicate in a list.

def first_duplicate(lst):
    seen = set()
    for x in lst:
        if x in seen:
            return x
        seen.add(x)
    return None

print(first_duplicate([3, 1, 3, 4, 2]))  # Output: 3

2️⃣ Q: Check whether a number is a palindrome.

def is_pal_num(n):
    return str(n) == str(n)[::-1]

print(is_pal_num(121))  # True  
print(is_pal_num(123))  # False

3️⃣ Q: Sort a dictionary by values.

def sort_by_value(d):
    return dict(sorted(d.items(), key=lambda x: x[1]))

print(sort_by_value({'a': 3, 'b': 1, 'c': 2}))  
Output: {'b': 1, 'c': 2, 'a': 3}

4️⃣ Q: Return all prime numbers in a given range.

def primes_upto(n):
    primes = []
    for num in range(2, n + 1):
        for i in range(2, int(num**0.5) + 1):
            if num % i == 0:
                break
        else:
            primes.append(num)
    return primes

print(primes_upto(10))  # [2, 3, 5, 7]

5️⃣ Q: Convert a list of numbers into a string.

def list_to_string(lst):
    return "".join(map(str, lst))

print(list_to_string([1, 2, 3]))  # Output: 123

💬 Double Tap ❤️ for Part-12

Attention guys, only 100 seats are left. If you haven’t registered yet to learn Python and Machine Learning for free, quickly sign up using the link given below 👇 And If you want 🎁Free Goodies + Free Certificate + Project Files + Live Q&A 🔗, then choose "Maharashtra" as your state. Register Now For Free😍 :- https://forms.gle/Zds1xFFes33BBQvD8

✅ Complete Roadmap to learn Python Programming 🐍💻 Week 1. Python basics • Install Python and VS Code • Learn variables, data types, input, output • Practice arithmetic and string operations • Write 10 small programs Example. Calculator, temperature converter Week 2. Control flow • Learn if, else, elif • Learn for and while loops • Use break and continue • Solve 20 logic problems Example. Number guessing game Week 3. Data structures • Lists, tuples, sets, dictionaries • Indexing, slicing, methods • Loop through collections • Solve real problems Example. Student marks analysis Week 4. Functions and modules • Define functions • Use parameters and return values • Learn lambda functions • Import built-in modules Example. Reusable math utility Week 5. Strings and file handling • String methods and formatting • Read and write files • Handle CSV and text files • Build small file-based programs Example. Log file analyzer Week 6. Error handling and debugging • Learn try, except, finally • Understand common errors • Use print and debugger • Fix broken programs Example. Robust input validator Week 7. Object-Oriented Programming • Classes and objects • Constructors and methods • Inheritance and encapsulation • Build simple class-based apps Example. Bank account system Week 8. Standard libraries • datetime, math, random • os and sys basics • Work with JSON • Write utility scripts Example. Automated folder organizer Week 9. Working with external packages • Learn pip and virtual environments • Use requests library • Basic API calls • Handle API responses Example. Weather app using API Week 10. Data handling basics • Intro to NumPy • Intro to Pandas • Read CSV and Excel files • Basic data cleaning Example. Sales data summary Week 11. Mini projects • Build 2 small projects • Focus on logic and structure • Write clean, readable code Examples. • To-do list app • Expense tracker Week 12. Final project and revision • Build one end-to-end project • Revise core concepts • Practice interview-style questions Example projects. • Simple automation tool • Data analysis mini project Daily rule for you • Code at least 60 minutes • Solve 5 problems daily • Rewrite old code weekly Double Tap ♥️ For Detailed Explanation

Guys, this is an amazing opportunity! If you want to learn Python completely for free, along with Machine Learning , then fill out the form using the link given below 👇 And If you want 🎁Free Goodies + Free Certificate + Project Files + Live Q&A 🔗, then choose "Maharashtra" as your state. Register Now For Free😍 :- https://forms.gle/Zds1xFFes33BBQvD8

✅ How to Learn Python in 2026 🐍📚 ✅ Step 1: Learn Syntax by Doing • Write code from Day 1 • Use print(), variables, and basic math • Practice with online REPLs or Jupyter Notebooks ✅ Step 2: Understand Core Concepts • Data types: int, str, list, dict, bool • Control flow: if, elif, else, for, while • Functions & return values ✅ Step 3: Apply Logic with Mini-Tasks • Reverse a string • Count vowels • Find max of three numbers • FizzBuzz ✅ Step 4: Learn by Projects, Not Just Theory • Weather App (API + CLI) • BMI Calculator • File Renamer • Basic Password Generator ✅ Step 5: Learn Libraries When Needed • pandas for data • requests for APIs • matplotlib for plots • re for regex ✅ Step 6: Build a Strong Habit • Code 30 mins daily • Track progress in a doc • Focus on learning, not perfection ✅ Step 7: Explore Career Paths with Python • Data Science → NumPy, pandas • Web Dev → Flask, Django • Automation → Selenium, os, shutil • AI/ML → scikit-learn, TensorFlow Don’t rush. Write. Debug. Learn. Repeat. 💬 Double Tap ♥️ For More!

⏳ ONLY 17 SEATS LEFT — THIS WON’T COME BACK! 🚨 🤖 ULTIMATE AI BUNDLE (5 COURSES FOR PRICE OF 4) People enrolling today will be job-ready before 2026. Those who skip may regret it next year 👀 🎓 What’s Included: ✔️ 65+ Hours of Expert Training ✔️ 20 Hands-On AI Projects ✔️ 5 Globally Recognized Certificates ✔️ Resume, LinkedIn & Interview Support 💼 Career Paths: AI Engineer | AI Automation Specialist | AI Agent Developer | Data Science Roles 💰 YEAR-END PRICE: ₹999/- ONLY 👉 Secure your seat now 👇 https://tinyurl.com/UltimateAIBundleXLearntubeCK

Hey guys, this is your last chance to access the free Python course from basic to advanced, where you’ll learn by building real-world projects. Only 2 hours are left—after that, we’ll go live. Enroll now! 👇 And If you want 🎁 Free goodies+ Free Certificate + Project Files + Live Q&A 🔗, then choose "Maharashtra" as your state. Register now for free 🤩 :- https://forms.gle/nhA61zpy7agUsCBq9

Hi guys, Only the last 35 seats are left for the Beginner to Advanced Python course. If you haven’t enrolled yet, hurry up and register using the link given below 👇 And If you want 🎁 Free goodies+ Free Certificate + Project Files + Live Q&A 🔗, then choose "Maharashtra" as your state. Register now for free 🤩 :- https://forms.gle/nhA61zpy7agUsCBq9