Data Analytics Projects - SQL, Excel, Tableau, Python & Power BI Interview Resources

Complete Roadmap to become a data scientist in 5 months Free Resources to learn Data Science: https://t.me/datasciencefun Week 1-2: Fundamentals - Day 1-3: Introduction to Data Science, its applications, and roles. - Day 4-7: Brush up on Python programming. - Day 8-10: Learn basic statistics and probability. Week 3-4: Data Manipulation and Visualization - Day 11-15: Pandas for data manipulation. - Day 16-20: Data visualization with Matplotlib and Seaborn. Week 5-6: Machine Learning Foundations - Day 21-25: Introduction to scikit-learn. - Day 26-30: Linear regression and logistic regression. Work on Data Science Projects: https://t.me/pythonspecialist/29 Week 7-8: Advanced Machine Learning - Day 31-35: Decision trees and random forests. - Day 36-40: Clustering (K-Means, DBSCAN) and dimensionality reduction. Week 9-10: Deep Learning - Day 41-45: Basics of Neural Networks and TensorFlow/Keras. - Day 46-50: Convolutional Neural Networks (CNNs) and Recurrent Neural Networks (RNNs). Week 11-12: Data Engineering - Day 51-55: Learn about SQL and databases. - Day 56-60: Data preprocessing and cleaning. Week 13-14: Model Evaluation and Optimization - Day 61-65: Cross-validation, hyperparameter tuning. - Day 66-70: Evaluation metrics (accuracy, precision, recall, F1-score). Week 15-16: Big Data and Tools - Day 71-75: Introduction to big data technologies (Hadoop, Spark). - Day 76-80: Basics of cloud computing (AWS, GCP, Azure). Week 17-18: Deployment and Production - Day 81-85: Model deployment with Flask or FastAPI. - Day 86-90: Containerization with Docker, cloud deployment (AWS, Heroku). Week 19-20: Specialization - Day 91-95: NLP or Computer Vision, based on your interests. Week 21-22: Projects and Portfolios - Day 96-100: Work on personal data science projects. Week 23-24: Soft Skills and Networking - Day 101-105: Improve communication and presentation skills. - Day 106-110: Attend online data science meetups or forums. Week 25-26: Interview Preparation - Day 111-115: Practice coding interviews on platforms like LeetCode. - Day 116-120: Review your projects and be ready to discuss them. Week 27-28: Apply for Jobs - Day 121-125: Start applying for entry-level data scientist positions. Week 29-30: Interviews - Day 126-130: Attend interviews, practice whiteboard problems. Week 31-32: Continuous Learning - Day 131-135: Stay updated with the latest trends in data science. Week 33-34: Accepting Offers - Day 136-140: Evaluate job offers and negotiate if necessary. Week 35-36: Settling In - Day 141-150: Start your new data science job, adapt to the team, and continue learning on the job. ENJOY LEARNING 👍👍

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If you are trying to transition into the data analytics domain and getting started with SQL, focus on the most useful concept that will help you solve the majority of the problems, and then try to learn the rest of the topics: 👉🏻 Basic Aggregation function: 1️⃣ AVG 2️⃣ COUNT 3️⃣ SUM 4️⃣ MIN 5️⃣ MAX 👉🏻 JOINS 1️⃣ Left 2️⃣ Inner 3️⃣ Self (Important, Practice questions on self join) 👉🏻 Windows Function (Important) 1️⃣ Learn how partitioning works 2️⃣ Learn the different use cases where Ranking/Numbering Functions are used? ( ROW_NUMBER,RANK, DENSE_RANK, NTILE) 3️⃣ Use Cases of LEAD & LAG functions 4️⃣ Use cases of Aggregate window functions 👉🏻 GROUP BY 👉🏻 WHERE vs HAVING 👉🏻 CASE STATEMENT 👉🏻 UNION vs Union ALL 👉🏻 LOGICAL OPERATORS Other Commonly used functions: 👉🏻 IFNULL 👉🏻 COALESCE 👉🏻 ROUND 👉🏻 Working with Date Functions 1️⃣ EXTRACTING YEAR/MONTH/WEEK/DAY 2️⃣ Calculating date differences 👉🏻CTE 👉🏻Views & Triggers (optional) Here is an amazing resources to learn & practice SQL: https://bit.ly/3FxxKPz Share with credits: https://t.me/sqlspecialist Hope it helps :)

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Here are some essential SQL tips for beginners 👇👇 ◆ Primary Key = Unique Key + Not Null constraint ◆ To perform case insensitive search use UPPER() function ex. UPPER(customer_name) LIKE ‘A%A’ ◆ LIKE operator is for string data type ◆ COUNT(*), COUNT(1), COUNT(0) all are same ◆ All aggregate functions ignore the NULL values ◆ Aggregate functions MIN, MAX, SUM, AVG, COUNT are for int data type whereas STRING_AGG is for string data type ◆ For row level filtration use WHERE and aggregate level filtration use HAVING ◆ UNION ALL will include duplicates where as UNION excludes duplicates  ◆ If the results will not have any duplicates, use UNION ALL instead of UNION ◆ We have to alias the subquery if we are using the columns in the outer select query ◆ Subqueries can be used as output with NOT IN condition. ◆ CTEs look better than subqueries. Performance wise both are same. ◆ When joining two tables , if one table has only one value then we can use 1=1 as a condition to join the tables. This will be considered as CROSS JOIN. ◆ Window functions work at ROW level. ◆ The difference between RANK() and DENSE_RANK() is that RANK() skips the rank if the values are the same. ◆ EXISTS works on true/false conditions. If the query returns at least one value, the condition is TRUE. All the records corresponding to the conditions are returned. Like for more 😄😄

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Business Metrics Every Data Analyst Must Know ✅ Revenue Metrics - Revenue: Total income from sales (e.g., monthly revenue ₹25 lakh) - Gross Revenue vs Net Revenue: Gross (before costs), Net (after discounts and returns) - Average Order Value: Revenue ÷ number of orders (e.g., ₹1,200 per order) Growth Metrics - Growth Rate: (Current − Previous) ÷ Previous (e.g., 15% month-over-month) - Year-over-Year Growth: Compare same period last year Customer Metrics - Customer Count: Total active customers - New vs Returning Customers: Shows retention strength - Customer Acquisition Cost: Total marketing spend ÷ new customers - Customer Lifetime Value: Total revenue from one customer over time Retention and Churn - Retention Rate: Customers who stayed ÷ total customers - Churn Rate: Customers lost ÷ total customers (e.g., 1,000 customers, lost 50, churn rate 5%) Marketing Metrics - Conversion Rate: Conversions ÷ visitors - Click-Through Rate: Clicks ÷ impressions - Return on Ad Spend: Revenue ÷ ad spend Product Metrics - Daily Active Users: Users active per day - Monthly Active Users: Users active per month - DAU to MAU Ratio: Engagement strength Operations Metrics - Order Fulfillment Time: Time to deliver order - Defect Rate: Defective units ÷ total units Mini Task Pick one business (E-commerce or EdTech). List 5 metrics it should track. Write one question each metric answers. Let's take E-commerce: 1. Revenue: What's our total sales this month? 2. Customer Acquisition Cost: How much are we spending to acquire each new customer? 3. Retention Rate: How many customers are coming back to shop? 4. Average Order Value: What's the average amount customers are spending per order? 5. Order Fulfillment Time: How quickly are we delivering orders? Double Tap ♥️ For More

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✅ Top Data Analytics Interview Questions with Answers – Part 1 🧠📈 1️⃣ What is the difference between Data Analytics and Data Science? Data Analytics focuses on analyzing existing data to find trends and insights. Data Science includes analytics but adds machine learning, statistical modeling predictions. 2️⃣ What is the difference between structured and unstructured data? • Structured: Organized (tables, rows, columns) – e.g., Excel, SQL DB • Unstructured: No fixed format – e.g., images, videos, social media posts 3️⃣ What is Data Cleaning? Why is it important? Removing or correcting inaccurate, incomplete, or irrelevant data. It ensures accurate analysis, better decision-making, and model performance. 4️⃣ Explain VLOOKUP and Pivot Tables in Excel. • VLOOKUP: Searches for a value in a column and returns a value in the same row from another column. • Pivot Table: Summarizes data by categories (grouping, totals, averages). 5️⃣ What is SQL JOIN? Combines rows from two or more tables based on a related column. Types: INNER JOIN, LEFT JOIN, RIGHT JOIN, FULL JOIN. 6️⃣ What is EDA (Exploratory Data Analysis)? It’s the process of visually and statistically exploring datasets to understand their structure, patterns, and anomalies. 7️⃣ Difference between COUNT(), SUM(), AVG(), MIN(), MAX() in SQL? These are aggregate functions used to perform calculations on columns. 💬 Tap ❤️ for Part 2

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