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

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

Kanalga Telegramโ€™da oโ€˜tish

Covering all technical and popular stuff about anything related to Data Science: AI, Big Data, Machine Learning, Statistics, general Math and the applications of former. Ads/ Promo: @love_data

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๐Ÿ“ˆ Telegram kanali Data Analytics Projects - SQL, Excel, Tableau, Python & Power BI Interview Resources analitikasi

Data Analytics Projects - SQL, Excel, Tableau, Python & Power BI Interview Resources (@sqlproject) Ingliz til segmentidagi kanali faol ishtirokchi. Hozirda hamjamiyat 39 525 obunachidan iborat bo'lib, Taสผlim toifasida 4 699-o'rinni va Hindiston mintaqasida 10 043-o'rinni egallagan.

๐Ÿ“Š Auditoriya koโ€˜rsatkichlari va dinamika

ะฝะตะฒั–ะดะพะผะพ sanasidan buyon loyiha tez oโ€˜sib, 39 525 obunachiga ega boโ€˜ldi.

23 Iyun, 2026 dagi oxirgi maโ€™lumotlarga koโ€˜ra kanal barqaror faollikka ega. Oxirgi 30 kunda obunachilar soni 152 ga, soโ€˜nggi 24 soatda esa -5 ga oโ€˜zgardi va umumiy qamrov yuqori darajada qolmoqda.

  • Tasdiqlash holati: Tasdiqlanmagan
  • Jalb etish (ER): Auditoriya oโ€˜rtacha 2.19% darajada jalb etiladi. Nashrdan keyingi dastlabki 24 soatda kontent odatda umumiy obunachilar sonining 0.50% ini tashkil etuvchi reaksiyalarni toโ€˜playdi.
  • Post qamrovi: Har bir post oโ€˜rtacha 866 marta koโ€˜riladi; birinchi sutkada odatda 196 ta koโ€˜rish yigโ€˜iladi.
  • Reaksiyalar va oโ€˜zaro taโ€™sir: Auditoriya faol: har bir postga oโ€˜rtacha 2 ta reaksiya keladi.
  • Tematik yoโ€˜nalishlar: Kontent analytic, dataset, visualization, sql, learning kabi asosiy mavzularga jamlangan.

๐Ÿ“ Tavsif va kontent siyosati

Muallif resursni shaxsiy fikrni ifoda etish maydoni sifatida taโ€™riflaydi:
โ€œCovering all technical and popular stuff about anything related to Data Science: AI, Big Data, Machine Learning, Statistics, general Math and the applications of former. Ads/ Promo: @love_dataโ€

Yuqori yangilanish chastotasi (oxirgi maโ€™lumot 24 Iyun, 2026 da olingan) sababli kanal doimo dolzarb va katta qamrovli boโ€˜lib qoladi. Analitika auditoriya kontent bilan faol hamkorlik qilishini, uni Taสผlim toifasidagi muhim taโ€™sir nuqtasiga aylantirishini koโ€˜rsatadi.

39 525
Obunachilar
-524 soatlar
-397 kunlar
+15230 kunlar
Postlar arxiv
๐Ÿ“Š ๐—ง๐—–๐—ฆ ๐—™๐—ฅ๐—˜๐—˜ ๐——๐—ฎ๐˜๐—ฎ ๐—”๐—ป๐—ฎ๐—น๐˜†๐˜๐—ถ๐—ฐ๐˜€ ๐—–๐—ฒ๐—ฟ๐˜๐—ถ๐—ณ๐—ถ๐—ฐ๐—ฎ๐˜๐—ถ๐—ผ๐—ป ๐—–๐—ผ๐˜‚๐—ฟ๐˜€๐—ฒ๐˜€ Here's an amazing opportunity from T
๐Ÿ“Š ๐—ง๐—–๐—ฆ ๐—™๐—ฅ๐—˜๐—˜ ๐——๐—ฎ๐˜๐—ฎ ๐—”๐—ป๐—ฎ๐—น๐˜†๐˜๐—ถ๐—ฐ๐˜€ ๐—–๐—ฒ๐—ฟ๐˜๐—ถ๐—ณ๐—ถ๐—ฐ๐—ฎ๐˜๐—ถ๐—ผ๐—ป ๐—–๐—ผ๐˜‚๐—ฟ๐˜€๐—ฒ๐˜€ Here's an amazing opportunity from TCS to learn essential data analytics skills completely FREE and earn a certificate ๐Ÿ”— ๐—˜๐—ป๐—ฟ๐—ผ๐—น๐—น ๐—™๐—ผ๐—ฟ ๐—™๐—ฅ๐—˜๐—˜๐Ÿ‘‡: https://pdlink.in/4waJYWJ ๐Ÿ”ฅ Data Analytics continues to be one of the most in-demand career paths, and this free course is a great first step toward building job-ready skills. โณ Don't miss this opportunity to upskill and boost your career!

โœ… Top Data Analyst Projects That Impress Recruiters ๐Ÿ“ˆ๐Ÿ’ผ 1. Sales Data Analysis โ†’ Analyze monthly/quarterly sales trends โ†’ Segment by product, region, and sales reps โ†’ Tools: Excel, SQL, Power BI/Tableau 2. Customer Retention Dashboard โ†’ Churn analysis and retention KPIs โ†’ Use cohort analysis, funnel visualization โ†’ Tools: Python, Tableau 3. E-commerce Data Exploration โ†’ Study user behavior, conversion rate โ†’ Analyze cart abandonment, top-selling products โ†’ Tools: SQL, Python (Pandas, Matplotlib) 4. HR Data Insights โ†’ Track hiring trends, attrition, diversity metrics โ†’ Build dashboards showing tenure, department stats โ†’ Tools: Excel, Power BI 5. Financial Data Modeling โ†’ Actual vs. forecasted revenue/costs โ†’ Include profitability ratios and variance analysis โ†’ Tools: Excel, Power BI, SQL 6. Web Traffic Analysis โ†’ Analyze Google Analytics or log data โ†’ Focus on user paths, bounce rates, session duration โ†’ Tools: Python, SQL 7. Survey Data Insights โ†’ Clean raw survey data, visualize trends โ†’ Sentiment analysis on feedback (optional NLP) โ†’ Tools: Excel, Python, Tableau Tips: โ€ข Explain the business impact of your insights โ€ข Show your workflow: data cleaning โ†’ analysis โ†’ visualization โ€ข Host projects on GitHub or portfolio site ๐Ÿ’ฌ Tap โค๏ธ for more!

๐Ÿณ ๐—™๐—ฅ๐—˜๐—˜ ๐—–๐—ฒ๐—ฟ๐˜๐—ถ๐—ณ๐—ถ๐—ฐ๐—ฎ๐˜๐—ถ๐—ผ๐—ป ๐—–๐—ผ๐˜‚๐—ฟ๐˜€๐—ฒ๐˜€ ๐—ง๐—ผ ๐—˜๐—ป๐—ฟ๐—ผ๐—น๐—น ๐—œ๐—ป ๐Ÿฎ๐Ÿฌ๐Ÿฎ๐Ÿฒ๐Ÿ˜ โœ… 100% FREE & Beginner-Friendly โœ… Lea
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๐Ÿ“‚ Top Projects for Data Analytics Portfolio ๐Ÿš€๐Ÿ’ป ๐Ÿ“Š 1. Sales Dashboard (Excel / Power BI / Tableau) โ–ถ๏ธ Analyze monthly/quarterly sales by region, category โ–ถ๏ธ Show KPIs: Revenue, YoY Growth, Profit Margin ๐Ÿ› 2. E-commerce Customer Segmentation (Python + Clustering) โ–ถ๏ธ Use RFM (Recency, Frequency, Monetary) model โ–ถ๏ธ Visualize clusters with Seaborn / Plotly ๐Ÿ“‰ 3. Churn Prediction Model (Python + ML) โ–ถ๏ธ Dataset: Telecom or SaaS customer data โ–ถ๏ธ Techniques: Logistic Regression, Decision Tree ๐Ÿ“ฆ 4. Supply Chain Delay Analysis (SQL + Tableau) โ–ถ๏ธ Identify causes of late deliveries using historical order data โ–ถ๏ธ Visualize supplier-wise performance ๐Ÿ“ˆ 5. A/B Testing for Product Feature (SQL + Python) โ–ถ๏ธ Simulate or use real test data (e.g. button click-through rates) โ–ถ๏ธ Metrics: Conversion Rate, Significance Test ๐Ÿ“ 6. COVID-19 Trend Tracker (Python + Dash) โ–ถ๏ธ Scrape or pull live data from APIs โ–ถ๏ธ Show cases, recovery, testing rates by country ๐Ÿ“… 7. HR Analytics โ€“ Attrition Analysis (Excel / Python) โ–ถ๏ธ Predict or explore employee exits โ–ถ๏ธ Use decision trees or visual storytelling ๐Ÿ’ก Tip: Upload projects to GitHub + create a simple portfolio site or blog to stand out. ๐Ÿ’ฌ Double Tap โค๏ธ For More

โœ… Power BI Roadmap: Step-by-Step Guide to Master Power BI ๐Ÿ“Š๐Ÿ’ป Whether you're aiming to be a data analyst, business intelligence pro, or dashboard expert โ€” this roadmap has you covered ๐Ÿ‘‡ ๐Ÿ“ 1. Power BI Basics โฆ  Get familiar with Power BI Desktop interface โฆ  Connect to data sources (Excel, CSV, databases) โฆ  Learn Basic visualizations: tables, charts, slicers ๐Ÿ“ 2. Data Transformation & Modeling โฆ  Use Power Query Editor to clean & shape data โฆ  Create relationships between tables โฆ  Understand data types & formats ๐Ÿ“ 3. DAX Fundamentals โฆ  Master calculated columns & measures โฆ  Learn core functions: SUM, CALCULATE, FILTER, RELATED โฆ  Use variables and time intelligence functions ๐Ÿ“ 4. Advanced Visualizations โฆ  Build interactive reports and dashboards โฆ  Use bookmarks, buttons & drill-throughs โฆ  Customize visuals & layouts for storytelling ๐Ÿ“ 5. Data Refresh & Gateway โฆ  Set up scheduled refresh with data gateways โฆ  Understand live vs import modes โฆ  Manage refresh performance ๐Ÿ“ 6. Row-Level Security (RLS) โฆ  Learn to restrict data access by user roles โฆ  Implement roles & test security in reports ๐Ÿ“ 7. Power BI Service & Collaboration โฆ  Publish reports to Power BI Service โฆ  Share dashboards and collaborate with teams โฆ  Use workspaces, apps, and permissions ๐Ÿ“ 8. Power BI Mobile & Embedded โฆ  Optimize reports for mobile devices โฆ  Embed Power BI visuals in apps or websites ๐Ÿ“ 9. Performance Optimization โฆ  Use Performance Analyzer to tune reports โฆ  Optimize data models & DAX queries โฆ  Best practices for large datasets ๐Ÿ“ 10. Power BI API & Automation โฆ  Use Power BI REST API for automation โฆ  Integrate with Power Automate & Azure services ๐Ÿ“ 11. Real Projects & Practice โฆ  Build sample dashboards: Sales, Marketing, Finance โฆ  Join challenges on platforms like Enterprise DNA, Radacad ๐Ÿ“ 12. Certification & Career Growth โฆ  Prepare for DA-100 / PL-300 certification โฆ  Build portfolio & LinkedIn presence โฆ  Apply for BI Analyst & Power BI Developer roles ๐Ÿ’ก Pro Tip: Combine Power BI skills with SQL and Python for a powerful data career combo! ๐Ÿ’ฌ Double Tap โ™ฅ๏ธ For More!

๐—”๐—ฐ๐—ฐ๐—ฒ๐—ป๐˜๐˜‚๐—ฟ๐—ฒ ๐—™๐—ฅ๐—˜๐—˜ ๐—ฉ๐—ถ๐—ฟ๐˜๐˜‚๐—ฎ๐—น ๐—œ๐—ป๐˜๐—ฒ๐—ฟ๐—ป๐˜€๐—ต๐—ถ๐—ฝ ๐—ณ๐—ผ๐—ฟ ๐——๐—ฎ๐˜๐—ฎ ๐—”๐—ป๐—ฎ๐—น๐˜†๐˜๐—ถ๐—ฐ๐˜€ ๐˜„๐—ถ๐˜๐—ต ๐—™๐—ฟ๐—ฒ๐—ฒ ๐—–๐—ฒ๐—ฟ๐˜
๐—”๐—ฐ๐—ฐ๐—ฒ๐—ป๐˜๐˜‚๐—ฟ๐—ฒ ๐—™๐—ฅ๐—˜๐—˜ ๐—ฉ๐—ถ๐—ฟ๐˜๐˜‚๐—ฎ๐—น ๐—œ๐—ป๐˜๐—ฒ๐—ฟ๐—ป๐˜€๐—ต๐—ถ๐—ฝ ๐—ณ๐—ผ๐—ฟ ๐——๐—ฎ๐˜๐—ฎ ๐—”๐—ป๐—ฎ๐—น๐˜†๐˜๐—ถ๐—ฐ๐˜€ ๐˜„๐—ถ๐˜๐—ต ๐—™๐—ฟ๐—ฒ๐—ฒ ๐—–๐—ฒ๐—ฟ๐˜๐—ถ๐—ณ๐—ถ๐—ฐ๐—ฎ๐˜๐—ฒ ๐Ÿ“Š Join the Accenture Virtual Internship Program and learn industry-relevant analytics skills with a free certificate ๐ŸŒ โœจ Learn from Accenture Industry Experts โœจ Boost Your Resume & LinkedIn Profile โœจ Gain Practical Analytics Experience โœจ Improve Career Opportunities in 2026 โœจ Great for Students & Freshers ๐Ÿ”— ๐—˜๐—ป๐—ฟ๐—ผ๐—น๐—น ๐—™๐—ผ๐—ฟ ๐—™๐—ฅ๐—˜๐—˜๐Ÿ‘‡: https://pdlink.in/42TuhXg ๐Ÿ”ฅ Start your Data Analytics journey today and gain valuable virtual internship experience from a top global company.

SQL isn't easy! Itโ€™s the powerful language that helps you manage and manipulate data in databases. To truly master SQL, focus on these key areas: 0. Understanding the Basics: Get comfortable with SQL syntax, data types, and basic queries like SELECT, INSERT, UPDATE, and DELETE. 1. Mastering Data Retrieval: Learn advanced SELECT statements, including JOINs, GROUP BY, HAVING, and subqueries to retrieve complex datasets. 2. Working with Aggregation Functions: Use functions like COUNT(), SUM(), AVG(), MIN(), and MAX() to summarize and analyze data efficiently. 3. Optimizing Queries: Understand how to write efficient queries and use techniques like indexing and query execution plans for performance optimization. 4. Creating and Managing Databases: Master CREATE, ALTER, and DROP commands for building and maintaining database structures. 5. Understanding Constraints and Keys: Learn the importance of primary keys, foreign keys, unique constraints, and indexes for data integrity. 6. Advanced SQL Techniques: Dive into CASE statements, CTEs (Common Table Expressions), window functions, and stored procedures for more powerful querying. 7. Normalizing Data: Understand database normalization principles and how to design databases to avoid redundancy and ensure consistency. 8. Handling Transactions: Learn how to use BEGIN, COMMIT, and ROLLBACK to manage transactions and ensure data integrity. 9. Staying Updated with SQL Trends: The world of databases evolvesโ€”stay informed about new SQL functions, database management systems (DBMS), and best practices. โณ With practice, hands-on experience, and a thirst for learning, SQL will empower you to unlock the full potential of data! You can read detailed article here I've curated essential SQL Interview Resources๐Ÿ‘‡ https://t.me/mysqldata Share with credits: https://t.me/sqlspecialist Hope it helps :)

๐Ÿš€ ๐—ง๐—ผ๐—ฝ ๐— ๐—ถ๐—ฐ๐—ฟ๐—ผ๐˜€๐—ผ๐—ณ๐˜ ๐—–๐—ฒ๐—ฟ๐˜๐—ถ๐—ณ๐—ถ๐—ฐ๐—ฎ๐˜๐—ถ๐—ผ๐—ป๐˜€ ๐—ฌ๐—ผ๐˜‚ ๐—–๐—ฎ๐—ป ๐—Ÿ๐—ฒ๐—ฎ๐—ฟ๐—ป ๐—ณ๐—ผ๐—ฟ ๐—™๐—ฅ๐—˜๐—˜! ๐Ÿ’ผ๐Ÿ”ฅ These free courses c
๐Ÿš€ ๐—ง๐—ผ๐—ฝ ๐— ๐—ถ๐—ฐ๐—ฟ๐—ผ๐˜€๐—ผ๐—ณ๐˜ ๐—–๐—ฒ๐—ฟ๐˜๐—ถ๐—ณ๐—ถ๐—ฐ๐—ฎ๐˜๐—ถ๐—ผ๐—ป๐˜€ ๐—ฌ๐—ผ๐˜‚ ๐—–๐—ฎ๐—ป ๐—Ÿ๐—ฒ๐—ฎ๐—ฟ๐—ป ๐—ณ๐—ผ๐—ฟ ๐—™๐—ฅ๐—˜๐—˜! ๐Ÿ’ผ๐Ÿ”ฅ These free courses can help you build in-demand tech skills for 2026 ๐Ÿ‘‡ โœ… Microsoft Azure Fundamentals โ˜๏ธ โœ… Power BI Data Analyst ๐Ÿ“Š โœ… Data Analysis Using Excel ๐Ÿ“ˆ โœ… Azure AI & Generative AI Courses ๐Ÿค– โœ… SQL & Data Engineering Learning Paths ๐Ÿ’ป ๐Ÿ’ก Why Learn Microsoft Certifications? โœจ Industry-Recognized Credentials โœจ Hands-on Learning โœจ High Demand Skills โœจ Better Career Opportunities ๐Ÿ”— ๐—˜๐—ป๐—ฟ๐—ผ๐—น๐—น ๐—™๐—ผ๐—ฟ ๐—™๐—ฅ๐—˜๐—˜๐Ÿ‘‡: https://pdlink.in/4nLVyVc ๐Ÿ”ฅ Start learning today and future-proof your career with Microsoft-certified skills.

Data Analytics Interview Topics in structured way : ๐Ÿ”ตPython: Data Structures: Lists, tuples, dictionaries, sets Pandas: Data manipulation (DataFrame operations, merging, reshaping) NumPy: Numeric computing, arrays Visualization: Matplotlib, Seaborn for creating charts ๐Ÿ”ตSQL: Basic : SELECT, WHERE, JOIN, GROUP BY, ORDER BY Advanced : Subqueries, nested queries, window functions DBMS: Creating tables, altering schema, indexing Joins: Inner join, outer join, left/right join Data Manipulation: UPDATE, DELETE, INSERT statements Aggregate Functions: SUM, AVG, COUNT, MAX, MIN ๐Ÿ”ตExcel: Formulas & Functions: VLOOKUP, HLOOKUP, IF, SUMIF, COUNTIF Data Cleaning: Removing duplicates, handling errors, text-to-columns PivotTables Charts and Graphs What-If Analysis: Scenario Manager, Goal Seek, Solver ๐Ÿ”ตPower BI: Data Modeling: Creating relationships between datasets Transformation: Cleaning & shaping data using Power Query Editor Visualization: Creating interactive reports and dashboards DAX (Data Analysis Expressions): Formulas for calculated columns, measures Publishing and sharing reports, scheduling data refresh ๐Ÿ”ต Statistics Fundamentals: Mean, median, mode Variance, standard deviation Probability distributions Hypothesis testing, p-values, confidence intervals ๐Ÿ”ตData Manipulation and Cleaning: Data preprocessing techniques (handling missing values, outliers), Data normalization and standardization Data transformation Handling categorical data ๐Ÿ”ตData Visualization: Chart types (bar, line, scatter, histogram, boxplot) Data visualization libraries (matplotlib, seaborn, ggplot) Effective data storytelling through visualization Also showcase these skills using data portfolio if possible Like for more content like this ๐Ÿ˜

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Step-by-step Guide to Create a Data Analyst Portfolio: โœ… 1๏ธโƒฃ Choose Your Tools & Skills Decide what tools you want to showcase: โ€ข Excel, SQL, Python (Pandas, NumPy) โ€ข Data visualization (Tableau, Power BI, Matplotlib, Seaborn) โ€ข Basic statistics and data cleaning โœ… 2๏ธโƒฃ Plan Your Portfolio Structure Your portfolio should include: โ€ข Home Page โ€“ Brief intro about you โ€ข About Me โ€“ Skills, tools, background โ€ข Projects โ€“ Showcased with explanations and code โ€ข Contact โ€“ Email, LinkedIn, GitHub โ€ข Optional: Blog or case studies โœ… 3๏ธโƒฃ Build Your Portfolio Website or Use Platforms Options: โ€ข Build your own website with HTML/CSS or React โ€ข Use GitHub Pages, Tableau Public, or LinkedIn articles โ€ข Make sure itโ€™s easy to navigate and mobile-friendly โœ… 4๏ธโƒฃ Add 3โ€“5 Detailed Projects Projects should cover: โ€ข Data cleaning and preprocessing โ€ข Exploratory Data Analysis (EDA) โ€ข Data visualization dashboards or reports โ€ข SQL queries or Python scripts for analysis Each project should include: โ€ข Problem statement โ€ข Dataset source โ€ข Tools & techniques used โ€ข Key findings & visualizations โ€ข Link to code (GitHub) or live dashboard โœ… 5๏ธโƒฃ Publish & Share Your Portfolio Host your portfolio on: โ€ข GitHub Pages โ€ข Tableau Public โ€ข Personal website or blog โœ… 6๏ธโƒฃ Keep It Updated โ€ข Add new projects regularly โ€ข Improve old ones based on feedback โ€ข Share insights on LinkedIn or data blogs ๐Ÿ’ก Pro Tips โ€ข Focus on storytelling with data โ€” explain what the numbers mean โ€ข Use clear visuals and dashboards โ€ข Highlight business impact or insights from your work โ€ข Include a downloadable resume and links to your profiles ๐ŸŽฏ Goal: Anyone visiting your portfolio should quickly understand your data skills, see your problem-solving ability, and know how to reach you. ๐Ÿ‘ Tap โค๏ธ if you found this helpful!

๐Ÿง  SQL Interview Question (Top-N per Group + Tie Handling - Tricky) ๐Ÿ“Œ scores(student_id, subject, marks) โ“ Ques : ๐Ÿ‘‰ Find students who scored the highest marks in each subject. ๐Ÿ‘‰ If multiple students have the same top score, include all of them (handle ties). ๐Ÿงฉ How Interviewers Expect You to Think โ€ข Group data by subject ๐Ÿ“š โ€ข Identify highest marks within each group โ€ข Handle ties correctly (donโ€™t lose rows) โ€ข Use window functions (RANK vs ROW_NUMBER) ๐Ÿ’ก SQL Solution SELECT student_id, subject, marks FROM ( SELECT scores.student_id, scores.subject, scores.marks, RANK() OVER ( PARTITION BY scores.subject ORDER BY scores.marks DESC ) AS rnk FROM scores ) ranked_scores WHERE ranked_scores.rnk = 1; ๐Ÿ”ฅ Why This Question Is Powerful โ€ข Tests Top-N per group (very common pattern) ๐Ÿง  โ€ข Checks understanding of RANK vs ROW_NUMBER โค๏ธ React if you want more real interview-level SQL questions ๐Ÿš€

โœ… SQL Checklist for Data Analysts ๐Ÿง ๐Ÿ’ป ๐Ÿ“š 1. Understand SQL Basics โ˜‘ What is SQL and how databases work โ˜‘ Relational vs non-relational databases โ˜‘ Table structure: rows, columns, keys ๐Ÿงฉ 2. Core SQL Queries โ˜‘ SELECT, FROM, WHERE โ˜‘ ORDER BY, LIMIT โ˜‘ DISTINCT, BETWEEN, IN, LIKE ๐Ÿ”— 3. Master Joins โ˜‘ INNER JOIN โ˜‘ LEFT JOIN / RIGHT JOIN โ˜‘ FULL OUTER JOIN โ˜‘ Practice combining data from multiple tables ๐Ÿ“Š 4. Aggregation & Grouping โ˜‘ COUNT, SUM, AVG, MIN, MAX โ˜‘ GROUP BY & HAVING โ˜‘ Aggregate filtering ๐Ÿ“ˆ 5. Subqueries & CTEs โ˜‘ Use subqueries inside SELECT/WHERE โ˜‘ WITH clause for common table expressions โ˜‘ Nested queries and optimization basics ๐Ÿงฎ 6. Window Functions โ˜‘ RANK(), ROW_NUMBER(), DENSE_RANK() โ˜‘ PARTITION BY & ORDER BY โ˜‘ LEAD(), LAG(), SUM() OVER ๐Ÿงน 7. Data Cleaning with SQL โ˜‘ Remove duplicates (DISTINCT, ROW_NUMBER) โ˜‘ Handle NULLs โ˜‘ Use CASE WHEN for conditional logic ๐Ÿ› ๏ธ 8. Practice & Real Tasks โ˜‘ Write queries from real datasets โ˜‘ Analyze sales, customers, transactions โ˜‘ Build reports with JOINs and aggregations ๐Ÿ“ 9. Tools to Use โ˜‘ PostgreSQL / MySQL / SQL Server โ˜‘ db-fiddle, Mode Analytics, DataCamp, StrataScratch โ˜‘ VS Code + SQL extensions ๐Ÿš€ 10. Interview Prep โ˜‘ Practice 50+ SQL questions โ˜‘ Solve problems on LeetCode, HackerRank โ˜‘ Explain query logic clearly in mock interviews ๐Ÿ’ฌ Tap โค๏ธ if this was helpful!

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๐—œ๐—ป๐˜๐—ฒ๐—ฟ๐˜ƒ๐—ถ๐—ฒ๐˜„๐—ฒ๐—ฟ: You have 2 minutes to solve this SQL query. List employees who earn more than their department manager's salary from the employees table (manager_id references employee id). ๐— ๐—ฒ: Challenge accepted!
SELECT e1.name, e1.department, e1.salary
FROM employees e1
JOIN employees e2 ON e1.department = e2.department AND e1.manager_id = e2.id
WHERE e1.salary > e2.salary;
I self-joined the employees table on department and manager_id to compare each employee's salary against their manager's in the same department. The WHERE clause filters for employees earning more. This tests join mastery for hierarchical data, common in org charts. ๐—ง๐—ถ๐—ฝ ๐—ณ๐—ผ๐—ฟ ๐—ฆ๐—ค๐—Ÿ ๐—๐—ผ๐—ฏ ๐—ฆ๐—ฒ๐—ฒ๐—ธ๐—ฒ๐—ฟ๐˜€: Self-joins shine for intra-table relationships like managers/employees or siblingsโ€”practice with employee hierarchies to impress in data engineering interviews! React with โค๏ธ for more

โœ… Complete SQL Roadmap in 2 Months Month 1: Strong SQL Foundations Week 1: Database and query basics - What SQL does in analytics and business - Tables, rows, columns - Primary key and foreign key - SELECT, DISTINCT - WHERE with AND, OR, IN, BETWEEN Outcome: You understand data structure and fetch filtered data. Week 2: Sorting and aggregation - ORDER BY and LIMIT - COUNT, SUM, AVG, MIN, MAX - GROUP BY - HAVING vs WHERE - Use case like total sales per product Outcome: You summarize data clearly. Week 3: Joins fundamentals - INNER JOIN - LEFT JOIN - RIGHT JOIN - Join conditions - Handling NULL values Outcome: You combine multiple tables correctly. Week 4: Joins practice and cleanup - Duplicate rows after joins - SELF JOIN with examples - Data cleaning using SQL - Daily join-based questions Outcome: You stop making join mistakes. Month 2: Analytics-Level SQL Week 5: Subqueries and CTEs - Subqueries in WHERE and SELECT - Correlated subqueries - Common Table Expressions - Readability and reuse Outcome: You write structured queries. Week 6: Window functions - ROW_NUMBER, RANK, DENSE_RANK - PARTITION BY and ORDER BY - Running totals - Top N per category problems Outcome: You solve advanced analytics queries. Week 7: Date and string analysis - Date functions for daily, monthly analysis - Year-over-year and month-over-month logic - String functions for text cleanup Outcome: You handle real business datasets. Week 8: Project and interview prep - Build a SQL project using sales or HR data - Write KPI queries - Explain query logic step by step - Daily interview questions practice Outcome: You are SQL interview ready. Practice platforms - LeetCode SQL - HackerRank SQL - Kaggle datasets Double Tap โ™ฅ๏ธ For Detailed Explanation of Each Topic

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