𝟰 𝗣𝗼𝘄𝗲𝗿𝗳𝘂𝗹 𝗙𝗿𝗲𝗲 𝗥𝗼𝗮𝗱𝗺𝗮𝗽𝘀 𝘁𝗼 𝗠𝗮𝘀𝘁𝗲𝗿 𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽𝘁, 𝗗𝗮𝘁𝗮 𝗦𝗰𝗶𝗲𝗻𝗰𝗲, 𝗔𝗜/𝗠𝗟 & 𝗙𝗿𝗼𝗻𝘁𝗲𝗻𝗱 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 😍

Learn Tech the Smart Way: Step-by-Step Roadmaps for Beginners🚀

Learning tech doesn’t have to be overwhelming—especially when you have a roadmap to guide you!📊📌

𝐋𝐢𝐧𝐤👇:-

https://pdlink.in/45wfx2V

Enjoy Learning ✅️

Let's now understand Data Science Roadmap in detail:

1. Math & Statistics (Foundation Layer)
This is the backbone of data science. Strong intuition here helps with algorithms, ML, and interpreting results.

Key Topics:

Linear Algebra: Vectors, matrices, matrix operations

Calculus: Derivatives, gradients (for optimization)

Probability: Bayes theorem, probability distributions

Statistics: Mean, median, mode, standard deviation, hypothesis testing, confidence intervals

Inferential Statistics: p-values, t-tests, ANOVA


Resources:

Khan Academy (Math & Stats)

"Think Stats" book

YouTube (StatQuest with Josh Starmer)


2. Python or R (Pick One for Analysis)
These are your main tools. Python is more popular in industry; R is strong in academia.

For Python Learn:

Variables, loops, functions, list comprehension

Libraries: NumPy, Pandas, Matplotlib, Seaborn


For R Learn:

Vectors, data frames, ggplot2, dplyr, tidyr


Goal: Be comfortable working with data, writing clean code, and doing basic analysis.

3. Data Wrangling (Data Cleaning & Manipulation)
Real-world data is messy. Cleaning and structuring it is essential.

What to Learn:

Handling missing values

Removing duplicates

String operations

Date and time operations

Merging and joining datasets

Reshaping data (pivot, melt)


Tools:

Python: Pandas

R: dplyr, tidyr


Mini Projects: Clean a messy CSV or scrape and structure web data.

4. Data Visualization (Telling the Story)
This is about showing insights visually for business users or stakeholders.

In Python:

Matplotlib, Seaborn, Plotly


In R:

ggplot2, plotly


Learn To:

Create bar plots, histograms, scatter plots, box plots

Design dashboards (can explore Power BI or Tableau)

Use color and layout to enhance clarity


5. Machine Learning (ML)
Now the real fun begins! Automate predictions and classifications.

Topics:

Supervised Learning: Linear Regression, Logistic Regression, Decision Trees, Random Forests, SVM

Unsupervised Learning: Clustering (K-means), PCA

Model Evaluation: Accuracy, Precision, Recall, F1-score, ROC-AUC

Cross-validation, Hyperparameter tuning


Libraries:

scikit-learn, xgboost


Practice On:

Kaggle datasets, Titanic survival, House price prediction


6. Deep Learning & NLP (Advanced Level)
Push your skills to the next level. Essential for AI, image, and text-based tasks.

Deep Learning:

Neural Networks, CNNs, RNNs

Frameworks: TensorFlow, Keras, PyTorch


NLP (Natural Language Processing):

Text preprocessing (tokenization, stemming, lemmatization)

TF-IDF, Word Embeddings

Sentiment Analysis, Topic Modeling

Transformers (BERT, GPT, etc.)


Projects:

Sentiment analysis from Twitter data

Image classifier using CNN


7. Projects (Build Your Portfolio)
Apply everything you've learned to real-world datasets.

Types of Projects:

EDA + ML project on a domain (finance, health, sports)

End-to-end ML pipeline

Deep Learning project (image or text)

Build a dashboard with your insights

Collaborate on GitHub, contribute to open-source


Tips:

Host projects on GitHub

Write about them on Medium, LinkedIn, or personal blog


8. ✅ Apply for Jobs (You're Ready!)
Now, you're prepared to apply with confidence.

Steps:

Prepare your resume tailored for DS roles

Sharpen interview skills (SQL, Python, case studies)

Practice on LeetCode, InterviewBit

Network on LinkedIn, attend meetups

Apply for internships or entry-level DS/DA roles


Keep learning and adapting. Data Science is vast and fast-moving—stay updated via newsletters, GitHub, and communities like Kaggle or Reddit.

Best Data Science & Machine Learning Resources: https://topmate.io/coding/914624

Credits: https://whatsapp.com/channel/0029Va4QUHa6rsQjhITHK82y

Like if you need similar content 😄👍

Hope this helps you 😊

𝟴 𝗕𝗲𝘀𝘁 𝗙𝗿𝗲𝗲 𝗗𝗮𝘁𝗮 𝗦𝗰𝗶𝗲𝗻𝗰𝗲 𝗖𝗼𝘂𝗿𝘀𝗲𝘀 𝗳𝗿𝗼𝗺 𝗛𝗮𝗿𝘃𝗮𝗿𝗱, 𝗠𝗜𝗧 & 𝗦𝘁𝗮𝗻𝗳𝗼𝗿𝗱😍

🎓 Learn Data Science for Free from the World’s Best Universities🚀

Top institutions like Harvard, MIT, and Stanford are offering world-class data science courses online — and they’re 100% free. 🎯📍

𝐋𝐢𝐧𝐤👇:-

https://pdlink.in/3Hfpwjc

All The Best 👍

🍻 Learn Computer Science from Harvard, Stanford, IBM, Microsoft, Google 🍻

❯ JavaScript
https://learn.microsoft.com/training/paths/web-development-101/

❯ TypeScript
https://learn.microsoft.com/training/paths/build-javascript-applications-typescript/

❯ C#
https://learn.microsoft.com/users/dotnet/collections/yz26f8y64n7k07

❯ Mathematics (incl. Statistics)
ocw.mit.edu/search/?d=Mathematics&s=department_course_numbers.sort_coursenum

❯ Data Science
cognitiveclass.ai/courses/data-science-101

Join for more: https://t.iss.one/udacityfreecourse

𝗟𝗲𝗮𝗿𝗻 𝗖𝗹𝗼𝘂𝗱 𝗖𝗼𝗺𝗽𝘂𝘁𝗶𝗻𝗴 𝗮𝗻𝗱 𝗗𝗲𝘃𝗢𝗽𝘀 𝗳𝗼𝗿 𝗙𝗥𝗘𝗘 𝘄𝗶𝘁𝗵 𝗚𝗼𝗼𝗴𝗹𝗲 𝗖𝗹𝗼𝘂𝗱😍

🚀 Break into Cloud Computing & DevOps with Google Cloud — Absolutely FREE!🔥

Want to become a Cloud Architect, DevOps Engineer, or simply understand cloud systems better?👨‍💻

𝐋𝐢𝐧𝐤👇:-

https://pdlink.in/4jyxBwS

Develop the skills employers are looking for✅️

Want to get started with System design interview preparation, start with these 👇

1. Learn to understand requirements
2. Learn the difference between horizontal and vertical scaling.
3. Study latency and throughput trade-offs and optimization techniques.
4. Understand the CAP Theorem (Consistency, Availability, Partition Tolerance).
5. Learn HTTP/HTTPS protocols, request-response lifecycle, and headers.
6. Understand DNS and how domain resolution works.
7. Study load balancers, their types (Layer 4 and Layer 7), and algorithms.
8. Learn about CDNs, their use cases, and caching strategies.
9. Understand SQL databases (ACID properties, normalization) and NoSQL types (key–value, document, graph).
10. Study caching tools (Redis, Memcached) and strategies (write-through, write-back, eviction policies).
11. Learn about blob storage systems like S3 or Google Cloud Storage.
12. Study sharding and horizontal partitioning of databases.
13. Understand replication (leader–follower, multi-leader) and consistency models.
14. Learn failover mechanisms like active-passive and active-active setups.
15. Study message queues like RabbitMQ, Kafka, and SQS.
16. Understand consensus algorithms such as Paxos and Raft.
17. Learn event-driven architectures, Pub/Sub models, and event sourcing.
18. Study distributed transactions (two-phase commit, sagas).
19. Learn rate-limiting techniques (token bucket, leaky bucket algorithms).
20. Study API design principles for REST, GraphQL, and gRPC.
21. Understand microservices architecture, communication, and trade-offs with monoliths.
22. Learn authentication and authorization methods (OAuth, JWT, SSO).
23. Study metrics collection tools like Prometheus or Datadog.
24. Understand logging systems (e.g., ELK stack) and tracing tools (OpenTelemetry, Jaeger).
25.Learn about encryption (data at rest and in transit) and rate-limiting for security.
26. And then practise the most commonly asked questions like URL shorteners, chat systems, ride-sharing apps, search engines, video streaming, and e-commerce websites

Coding Interview Resources: https://whatsapp.com/channel/0029VammZijATRSlLxywEC3X

𝗧𝗼𝗽 𝗖𝗼𝗺𝗽𝗮𝗻𝗶𝗲𝘀 𝗛𝗶𝗿𝗶𝗻𝗴 𝗗𝗮𝘁𝗮 𝗔𝗻𝗮𝗹𝘆𝘀𝘁𝘀😍

𝗔𝗽𝗽𝗹𝘆 𝗟𝗶𝗻𝗸𝘀:-👇

S&P Global :- https://pdlink.in/3ZddwVz

IBM :- https://pdlink.in/4kDmMKE

TVS Credit :- https://pdlink.in/4mI0JVc

Sutherland :- https://pdlink.in/4mGYBgg

Other Jobs :- https://pdlink.in/44qEIDu

Apply before the link expires 💫

Here are some commonly asked SQL interview questions along with brief answers:

1. What is SQL?
- SQL stands for Structured Query Language, used for managing and manipulating relational databases.

2. What are the types of SQL commands?
- SQL commands can be broadly categorized into four types: Data Definition Language (DDL), Data Manipulation Language (DML), Data Control Language (DCL), and Transaction Control Language (TCL).

3. What is the difference between CHAR and VARCHAR data types?
- CHAR is a fixed-length character data type, while VARCHAR is a variable-length character data type. CHAR will always occupy the same amount of storage space, while VARCHAR will only use the necessary space to store the actual data.

4. What is a primary key?
- A primary key is a column or a set of columns that uniquely identifies each row in a table. It ensures data integrity by enforcing uniqueness and can be used to establish relationships between tables.

5. What is a foreign key?
- A foreign key is a column or a set of columns in one table that refers to the primary key in another table. It establishes a relationship between two tables and ensures referential integrity.

6. What is a JOIN in SQL?
- JOIN is used to combine rows from two or more tables based on a related column between them. There are different types of JOINs, including INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.

7. What is the difference between INNER JOIN and OUTER JOIN?
- INNER JOIN returns only the rows that have matching values in both tables, while OUTER JOIN (LEFT, RIGHT, FULL) returns all rows from one or both tables, with NULL values in columns where there is no match.

8. What is the difference between GROUP BY and ORDER BY?
- GROUP BY is used to group rows that have the same values into summary rows, typically used with aggregate functions like SUM, COUNT, AVG, etc., while ORDER BY is used to sort the result set based on one or more columns.

9. What is a subquery?
- A subquery is a query nested within another query, used to return data that will be used in the main query. Subqueries can be used in SELECT, INSERT, UPDATE, and DELETE statements.

10. What is normalization in SQL?
- Normalization is the process of organizing data in a database to reduce redundancy and dependency. It involves dividing large tables into smaller tables and defining relationships between them to improve data integrity and efficiency.

Around 90% questions will be asked from sql in data analytics interview, so please make sure to practice SQL skills using websites like stratascratch. ☺️💪

𝟰 𝗙𝗿𝗲𝗲 𝗣𝘆𝘁𝗵𝗼𝗻 𝗖𝗼𝘂𝗿𝘀𝗲𝘀 𝘁𝗼 𝗕𝗼𝗼𝘀𝘁 𝗬𝗼𝘂𝗿 𝗥𝗲𝘀𝘂𝗺𝗲 𝗶𝗻 𝟮𝟬𝟮𝟱😍

Want to Boost Your Resume with In-Demand Python Skills?👨‍💻

In today’s tech-driven world, Python is one of the most in-demand programming languages across data science, software development, and machine learning📊📌

𝐋𝐢𝐧𝐤👇:-

https://pdlink.in/3Hnx3wh

Enjoy Learning ✅️

Complete Roadmap to learn DSA in 30 days

Day 1-5: Introduction to Data Structures and Algorithms
- Understand the importance of DSA in programming
- Learn about different types of data structures (arrays, linked lists, stacks, queues, trees, graphs)
- Study basic algorithms like searching and sorting

Day 6-10: Arrays and Strings
- Dive deeper into arrays and strings
- Learn about common operations and algorithms on arrays and strings
- Practice solving problems related to arrays and strings

Day 11-15: Linked Lists
- Study linked lists and their variations (singly linked list, doubly linked list, circular linked list)
- Implement basic operations on linked lists
- Solve problems involving linked lists

Day 16-20: Stacks and Queues
- Learn about stacks and queues and their applications
- Implement stack and queue data structures
- Solve problems using stacks and queues

Day 21-25: Trees and Graphs
- Study binary trees, binary search trees, AVL trees, heaps, and graphs
- Understand traversal algorithms (inorder, preorder, postorder) for trees
- Implement basic graph algorithms (DFS, BFS)
- Solve problems related to trees and graphs

Day 26-30: Advanced Topics
- Study advanced data structures like hash tables, tries, segment trees
- Learn about dynamic programming, backtracking, and divide and conquer algorithms
- Practice solving complex problems that require a combination of data structures and algorithms

Throughout the 30 days, make sure to practice regularly by solving coding problems on platforms like LeetCode, HackerRank, or Codeforces. Additionally, review your concepts regularly and seek out resources like online tutorials, textbooks, and study groups to deepen your understanding of DSA.

5⃣ Free DSA resources to crack coding interview

👉 GeekforGeeks

👉 Leetcode

👉 Hackerrank

👉 DSA Resources

👉 FreeCodeCamp

Join for more free resources: https://t.iss.one/free4unow_backup

ENJOY LEARNING 👍👍

Don't forget to check these 10 SQL projects with corresponding datasets that you could use to practice your SQL skills:

1. Analysis of Sales Data:

(https://www.kaggle.com/kyanyoga/sample-sales-data)

2. HR Analytics:

(https://www.kaggle.com/pavansubhasht/ibm-hr-analytics-attrition-dataset)

3. Social Media Analytics:

(https://www.kaggle.com/datasets/ramjasmaurya/top-1000-social-media-channels)

4. Financial Data Analysis:

(https://www.kaggle.com/datasets/nitindatta/finance-data)

5. Healthcare Data Analysis:

(https://www.kaggle.com/cdc/mortality)

6. Customer Relationship Management:

(https://www.kaggle.com/pankajjsh06/ibm-watson-marketing-customer-value-data)

7. Web Analytics:

(https://www.kaggle.com/zynicide/wine-reviews)

8. E-commerce Analysis:

(https://www.kaggle.com/olistbr/brazilian-ecommerce)

9. Supply Chain Management:

(https://www.kaggle.com/datasets/harshsingh2209/supply-chain-analysis)

10. Inventory Management:

(https://www.kaggle.com/datasets?search=inventory+management)

Share this channel with your friends 🤝🤩

Roadmap to learn Network Engineering

Here's a comprehensive guide to mastering the essential skills and knowledge areas:

1. Networking Fundamentals: OSI model, TCP/IP model, and networking devices (routers, switches, hubs, bridges).

2. Network Protocols: Core protocols (TCP, UDP, IP), application layer protocols (HTTP, HTTPS, FTP, DNS, DHCP), and additional protocols (SNMP, ICMP, ARP).

3. Routing and Switching: Routing protocols (OSPF, EIGRP, BGP), switching concepts (VLANs, STP, trunking), and routing techniques.

4. Network Design and Architecture: Network topologies (star, mesh, bus, ring), design principles (redundancy, scalability, reliability), and network types (LAN,
WAN, MAN, WLAN, VLAN).

5. Network Security: Firewalls, VPNs, ACLs, security protocols (SSL/TLS, IPSec), and best practices.

6. Wireless Networking: Wireless standards (IEEE 802.11a/b/g/n/ac/ax), wireless security (WPA2, WPA3), and network design.

7. Cloud Networking: Cloud services (VPC, Direct Connect, VPN), hybrid cloud Networking, and cloud providers (AWS, Azure, Google Cloud).

8. Network Automation and Scripting: Network programmability, automation techniques, and scripting (Python, Bash, PowerShell).

9. Monitoring and Troubleshooting: Network monitoring, troubleshooting techniques (ping, traceroute, network diagrams), and performance monitoring (NetFlow, SNMP).

10. Virtualization and Container Networking: Virtual network functions (NFV), software-defined networking (SDN), and container networking (Docker, Kubernetes).

11. Certifications: Entry-level (CompTIA Network+, Cisco CCNA), professional-level (Cisco CCNP, Juniper JNCIP), advanced-level (Cisco CCIE, VMware VCP-NV).

𝗛𝗼𝘄 𝘁𝗼 𝗖𝗿𝗮𝗰𝗸 𝗬𝗼𝘂𝗿 𝗙𝗶𝗿𝘀𝘁 𝗧𝗲𝗰𝗵 𝗜𝗻𝘁𝗲𝗿𝗻𝘀𝗵𝗶𝗽 (𝗘𝘃𝗲𝗻 𝗪𝗶𝘁𝗵𝗼𝘂𝘁 𝗘𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲!)🚀

Breaking into tech without prior experience can feel impossible—especially when every posting demands what you don’t have: experience.
But here’s the truth: Skills > Experience (especially for interns).

Let’s break it down into a proven 6-step roadmap that actually works👇

🔹 𝗦𝘁𝗲𝗽 𝟭: Build Core Skills (No CS Degree Needed!)
Start with the fundamentals:
✅ Choose one language: Python / JavaScript / C++
✅ Learn DSA basics: Arrays, Strings, Recursion, Hashmaps
✅ Explore either Web Dev (HTML, CSS, JS) or Backend (Node.js, Flask)
✅ Understand SQL + Git/GitHub for version control

🔹 𝗦𝘁𝗲𝗽 𝟮: Build Mini Projects (Your Real Resume!)
Internships look for what you can do, not just what you’ve learned. Build:
✅ A Portfolio Website (HTML, CSS, JS)
✅ A To-Do App (React + Firebase)
✅ A REST API (Node.js + MongoDB)

👉 One solid project > Dozens of certificates.
📍 Showcase it on GitHub and LinkedIn.

🔹 𝗦𝘁𝗲𝗽 𝟯: Contribute to Open Source (Get Real-World Exposure)
You don’t need a job to gain experience. Try:
✅ Beginner-friendly GitHub repos
✅ Fixing bugs, improving documentation
✅ Participating in Hacktoberfest, GirlScript, MLH

This builds confidence and credibility.

🔹 𝗦𝘁𝗲𝗽 𝟰: Optimize Resume & LinkedIn (Your Digital First Impression)
❌ No generic lines like “I’m passionate about coding”
✅ Highlight projects, GitHub links, and tech stack
✅ Use keywords like “Software Engineering Intern | JavaScript | SQL”
✅ Keep it concise—1 page is enough

📌 Stay active on GitHub + LinkedIn. Recruiters notice!

🔹 𝗦𝘁𝗲𝗽 𝟱: Apply Smart, Not Hard
Don’t just mass-apply. Be strategic:
✅ Check internship portals (Internshala, LinkedIn, AngelList)
✅ Explore company careers pages (TCS, Infosys, Amazon, startups)
✅ Reach out via referrals—network with seniors, alumni, or connections

💬 Try:
"Hi [Name], I admire your work at [Company]. I’ve been building skills in [Tech] and am seeking an internship. Are there any roles I could apply for?"

Networking opens doors applications can’t.

🔹 𝗦𝘁𝗲𝗽 𝟲:Ace the Interview (Preparation Beats Perfection)
✅ Know your resume inside-out
✅ Review basics of DSA, OOP, DBMS, OS
✅ Practice your intro—highlight projects + relevant skills
✅ Do mock interviews with peers or platforms like InterviewBit, Pramp

And if you’re rejected? Don’t stress. Ask for feedback and keep building.

🎯 𝗬𝗼𝘂𝗿 𝗙𝗶𝗿𝘀𝘁 𝗜𝗻𝘁𝗲𝗿𝗻𝘀𝗵𝗶𝗽 = 𝗬𝗼𝘂𝗿 𝗙𝗶𝗿𝘀𝘁 𝗕𝗿𝗲𝗮𝗸𝘁𝗵𝗿𝗼𝘂𝗴𝗵
No one starts perfect. Consistency beats credentials.
Start small, stay curious, and show up every day.

Let me know if you’re just getting started 👇

Web Development Resources ⬇️
https://whatsapp.com/channel/0029Vax4TBY9Bb62pAS3mX32

ENJOY LEARNING 👍👍

#webdevelopment

🎓 𝗟𝗲𝗮𝗿𝗻 𝗖𝗼𝗺𝗽𝘂𝘁𝗲𝗿 𝗦𝗰𝗶𝗲𝗻𝗰𝗲 𝗳𝗼𝗿 𝗙𝗿𝗲𝗲 𝗳𝗿𝗼𝗺 𝗛𝗮𝗿𝘃𝗮𝗿𝗱, 𝗦𝘁𝗮𝗻𝗳𝗼𝗿𝗱, 𝗠𝗜𝗧 & 𝗚𝗼𝗼𝗴𝗹𝗲😍

Why pay thousands when you can access world-class Computer Science courses for free? 🌐

Top institutions like Harvard, Stanford, MIT, and Google offer high-quality learning resources to help you master in-demand tech skills👨‍🎓📌

𝐋𝐢𝐧𝐤👇:-

https://pdlink.in/3ZyQpFd

Perfect for students, self-learners, and career switchers✅️

What is the difference between data scientist, data engineer, data analyst and business intelligence?

🧑🔬 Data Scientist
Focus: Using data to build models, make predictions, and solve complex problems.
Cleans and analyzes data
Builds machine learning models
Answers “Why is this happening?” and “What will happen next?”
Works with statistics, algorithms, and coding (Python, R)
Example: Predict which customers are likely to cancel next month

🛠️ Data Engineer
Focus: Building and maintaining the systems that move and store data.
Designs and builds data pipelines (ETL/ELT)
Manages databases, data lakes, and warehouses
Ensures data is clean, reliable, and ready for others to use
Uses tools like SQL, Airflow, Spark, and cloud platforms (AWS, Azure, GCP)
Example: Create a system that collects app data every hour and stores it in a warehouse

📊 Data Analyst
Focus: Exploring data and finding insights to answer business questions.
Pulls and visualizes data (dashboards, reports)
Answers “What happened?” or “What’s going on right now?”
Works with SQL, Excel, and tools like Tableau or Power BI
Less coding and modeling than a data scientist
Example: Analyze monthly sales and show trends by region

📈 Business Intelligence (BI) Professional
Focus: Helping teams and leadership understand data through reports and dashboards.
Designs dashboards and KPIs (key performance indicators)
Translates data into stories for non-technical users
Often overlaps with data analyst role but more focused on reporting
Tools: Power BI, Looker, Tableau, Qlik
Example: Build a dashboard showing company performance by department

🧩 Summary Table
Data Scientist - What will happen? Tools: Python, R, ML tools, predictions & models
Data Engineer - How does the data move and get stored? Tools: SQL, Spark, cloud tools, infrastructure & pipelines
Data Analyst - What happened? Tools: SQL, Excel, BI tools, reports & exploration
BI Professional - How can we see business performance clearly? Tools: Power BI, Tableau, dashboards & insights for decision-makers

🎯 In short:
Data Engineers build the roads.
Data Scientists drive smart cars to predict traffic.
Data Analysts look at traffic data to see patterns.
BI Professionals show everyone the traffic report on a screen.

𝗣𝗿𝗲𝗽𝗮𝗿𝗶𝗻𝗴 𝗳𝗼𝗿 𝗮𝗻 𝗔𝗺𝗮𝘇𝗼𝗻 𝗗𝗮𝘁𝗮 𝗥𝗼𝗹𝗲? 𝗦𝘁𝗮𝗿𝘁 𝘄𝗶𝘁𝗵 𝗧𝗵𝗲𝘀𝗲 𝗧𝗼𝗽 𝗦𝗤𝗟 𝗜𝗻𝘁𝗲𝗿𝘃𝗶𝗲𝘄 𝗤𝘂𝗲𝘀𝘁𝗶𝗼𝗻𝘀😍

💼 Why SQL Is Crucial for Amazon Interviews🗣

If you’re applying for a data analyst, data engineer, or business analyst role at Amazon, expect SQL to be a major part of the interview process👨‍💻📌

𝐋𝐢𝐧𝐤👇:-

https://pdlink.in/4jrLrRy

Practicing real Amazon SQL interview questions is the key to success✅️

Ai concepts explained

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Complete 14-day roadmap to learn SQL learning:

Day 1: Introduction to Databases
- Understand the concept of databases and their importance.
- Learn about relational databases and SQL.
- Explore the basic structure of SQL queries.

Day 2: Basic SQL Syntax
- Learn SQL syntax: statements, clauses, and keywords.
- Understand the SELECT statement for retrieving data.
- Practice writing basic SELECT queries with conditions and filters.

Day 3: Retrieving Data from Multiple Tables
- Learn about joins: INNER JOIN, LEFT JOIN, RIGHT JOIN.
- Understand how to retrieve data from multiple tables using joins.
- Practice writing queries involving multiple tables.

Day 4: Aggregate Functions
- Learn about aggregate functions: COUNT, SUM, AVG, MIN, MAX.
- Understand how to use aggregate functions to perform calculations on data.
- Practice writing queries with aggregate functions.

Day 5: Subqueries
- Learn about subqueries and their role in SQL.
- Understand how to use subqueries in SELECT, WHERE, and FROM clauses.
- Practice writing queries with subqueries.

Day 6: Data Manipulation Language (DML)
- Learn about DML commands: INSERT, UPDATE, DELETE.
- Understand how to add, modify, and delete data in a database.
- Practice writing DML statements.

Day 7: Data Definition Language (DDL)
- Learn about DDL commands: CREATE TABLE, ALTER TABLE, DROP TABLE.
- Understand constraints: PRIMARY KEY, FOREIGN KEY, UNIQUE, NOT NULL.
- Practice designing database schemas and creating tables.

Day 8: Data Control Language (DCL)
- Learn about DCL commands: GRANT, REVOKE for managing user permissions.
- Understand how to control access to database objects.
- Practice granting and revoking permissions.

Day 9: Transactions
- Understand the concept of transactions in SQL.
- Learn about transaction control commands: COMMIT, ROLLBACK.
- Practice managing transactions.

Day 10: Views
- Learn about views and their benefits.
- Understand how to create, modify, and drop views.
- Practice creating views.

Day 11: Indexes
- Learn about indexes and their role in database optimization.
- Understand different types of indexes (e.g., B-tree, hash).
- Practice creating and managing indexes.

Day 12: Optimization Techniques
- Explore optimization techniques such as query tuning and normalization.
- Understand the importance of database design for optimization.
- Practice optimizing SQL queries.

Day 13: Review and Practice
- Review all concepts covered in the previous days.
- Work on sample projects or exercises to reinforce learning.
- Take practice quizzes or tests.

Day 14: Final Review and Projects
- Review all concepts learned throughout the 14 days.
- Work on a final project to apply SQL knowledge.
- Seek out additional resources or tutorials if needed.


Here are some practical SQL syntax examples for each day of your learning journey:

Day 1: Introduction to Databases
- Syntax to select all columns from a table:

   SELECT * FROM table_name;
  

Day 2: Basic SQL Syntax
- Syntax to select specific columns from a table:

   SELECT column1, column2 FROM table_name;
  

Day 3: Retrieving Data from Multiple Tables
- Syntax for INNER JOIN to retrieve data from two tables:

   SELECT orders.order_id, customers.customer_name
  FROM orders
  INNER JOIN customers ON orders.customer_id = customers.customer_id;
  

Day 4: Aggregate Functions
- Syntax for COUNT to count the number of rows in a table:

   SELECT COUNT(*) FROM table_name;
  

Day 5: Subqueries
- Syntax for using a subquery in the WHERE clause:

   SELECT column1, column2 
  FROM table_name 
  WHERE column1 IN (SELECT column1 FROM another_table WHERE condition);
  

Day 6: Data Manipulation Language (DML)
- Syntax for INSERT to add data into a table:

   INSERT INTO table_name (column1, column2) VALUES (value1, value2);
 

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🚀 Backend Developer Roadmap 🚀

1. Foundation: 📚 Learn fundamental programming concepts such as variables, data types, and control flow. Master a programming language like Python, Java, or JavaScript.

2. Database Management: 🛢️ Understand database systems like SQL and NoSQL. Learn about relational databases (e.g., MySQL, PostgreSQL) and non-relational databases (e.g., MongoDB, Redis).

3. API Development: 🌐 Explore RESTful API principles and design patterns. Learn how to create, test, and document APIs using frameworks like Flask (Python), Spring Boot (Java), or Express (JavaScript).

4. Authentication & Authorization: 🔒 Dive into authentication methods like JWT (JSON Web Tokens) and OAuth. Understand authorization mechanisms to control access to resources securely.

5. Server-Side Frameworks: 🛠️ Get hands-on experience with backend frameworks such as Django (Python), Spring (Java), or Express (JavaScript). Learn how to build robust, scalable web applications.

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7. Testing & Debugging: 🐞 Master unit testing, integration testing, and end-to-end testing techniques. Use debugging tools and practices to identify and resolve issues effectively.

8. Security Best Practices: 🛡️ Learn about common security threats and how to mitigate them. Implement security measures such as input validation, encryption, and secure communication protocols.

9. Containerization & Deployment: 🚢 Familiarize yourself with containerization technologies like Docker and container orchestration platforms like Kubernetes. Learn how to deploy and manage applications in production environments.

10. Monitoring & Logging: 📊 Understand the importance of monitoring and logging for application health and performance. Explore tools like Prometheus, Grafana, and ELK stack for monitoring and log management.

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12. Continuous Integration & Deployment (CI/CD): 🔄🚀 Implement CI/CD pipelines to automate testing, building, and deployment processes. Utilize tools like Jenkins, GitLab CI, or GitHub Actions for seamless integration and deployment.

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14. Documentation: 📄 Document your code, APIs, and system architecture effectively. Clear documentation improves understanding, maintenance, and collaboration among team members.

15. Stay Updated: 📰 Keep abreast of new technologies, frameworks, and best practices in backend development. Engage with the community, attend conferences, and participate in online forums to stay current.