✅ SQL Skills Every Data Analyst Must Know 🗄️📊

🧠 SQL BASICS
1. SELECT Statement
2. WHERE Clause
3. ORDER BY
4. LIMIT / TOP
5. DISTINCT
6. Aliases
7. Basic Syntax Rules
8. Filtering Data

🔗 JOINS
1. INNER JOIN
2. LEFT JOIN
3. RIGHT JOIN
4. FULL JOIN
5. SELF JOIN
6. Cross Join
7. Joining Multiple Tables
8. Handling NULLs in Joins

📊 AGGREGATIONS
1. COUNT()
2. SUM()
3. AVG()
4. MIN()
5. MAX()
6. GROUP BY
7. HAVING Clause
8. Conditional Aggregation

⚙️ ADVANCED SQL
1. Subqueries
2. Common Table Expressions (CTE)
3. Window Functions
4. CASE WHEN
5. Views
6. Temporary Tables
7. Stored Procedures
8. Indexing Basics

📂 DATA MANIPULATION
1. INSERT
2. UPDATE
3. DELETE
4. MERGE
5. TRUNCATE
6. Data Import
7. Data Export
8. Transactions (COMMIT, ROLLBACK)

🚀 PERFORMANCE OPTIMIZATION
1. Indexing
2. Query Optimization
3. Execution Plans
4. Avoiding Full Table Scans
5. Partitioning
6. Query Refactoring
7. Caching
8. Database Tuning

🧱 DATABASE CONCEPTS
1. Normalization
2. Denormalization
3. OLTP vs OLAP
4. Data Warehousing
5. Star Snowflake Schema
6. Constraints (PK, FK)
7. ACID Properties
8. Data Integrity

📊 REAL-WORLD SKILLS
1. Writing Business Queries
2. Data Cleaning using SQL
3. Report Generation
4. Dashboard Data Prep
5. Handling Large Datasets
6. Debugging Queries
7. Interview Problem Solving
8. Case Study Practice

SQL For Data Analytics: https://whatsapp.com/channel/0029Vb6hJmM9hXFCWNtQX944

💬 Tap ❤️ if this helped you follow for more SQL content!

Top 100 Data Analyst Interview Questions

✅ Data Analytics Basics
1. What is data analytics?
2. Difference between data analytics and data science?
3. What problems does a data analyst solve?
4. What are the types of data analytics?
5. What tools do data analysts use daily?
6. What is a KPI?
7. What is a metric vs KPI?
8. What is descriptive analytics?
9. What is diagnostic analytics?
10. What does a typical day of a data analyst look like?

Data and Databases
11. What is structured data?
12. What is semi-structured data?
13. What is unstructured data?
14. What is a database?
15. Difference between OLTP and OLAP?
16. What is a primary key?
17. What is a foreign key?
18. What is a fact table?
19. What is a dimension table?
20. What is a data warehouse?

SQL for Data Analysts
21. What is SELECT used for?
22. Difference between WHERE and HAVING?
23. What is GROUP BY?
24. What are aggregate functions?
25. Difference between INNER and LEFT JOIN?
26. What are subqueries?
27. What is a CTE?
28. How do you handle duplicates in SQL?
29. How do you handle NULL values?
30. What are window functions?

Excel for Data Analysis
31. What are pivot tables?
32. Difference between VLOOKUP and XLOOKUP?
33. What is conditional formatting?
34. What are COUNTIFS and SUMIFS?
35. What is data validation?
36. How do you remove duplicates in Excel?
37. What is IF formula used for?
38. Difference between relative and absolute reference?
39. How do you clean data in Excel?
40. What are common Excel mistakes analysts make?

Data Cleaning and Preparation
41. What is data cleaning?
42. How do you handle missing data?
43. How do you treat outliers?
44. What is data normalization?
45. What is data standardization?
46. How do you check data quality?
47. What is duplicate data?
48. How do you validate source data?
49. What is data transformation?
50. Why is data preparation important?

Statistics for Data Analysts
51. Difference between mean and median?
52. What is standard deviation?
53. What is variance?
54. What is correlation?
55. Difference between correlation and causation?
56. What is an outlier?
57. What is sampling?
58. What is distribution?
59. What is skewness?
60. When do you use median over mean?

Data Visualization
61. Why is data visualization important?
62. Difference between bar and line chart?
63. When do you use a pie chart?
64. What is a dashboard?
65. What makes a good dashboard?
66. What is a KPI card?
67. Common visualization mistakes?
68. How do you choose the right chart?
69. What is drill down?
70. What is data storytelling?

Power BI or Tableau
71. What is Power BI or Tableau used for?
72. What is a data model?
73. What is a relationship?
74. What is DAX?
75. Difference between measure and calculated column?
76. What is Power Query?
77. What are filters and slicers?
78. What is row level security?
79. What is refresh schedule?
80. How do you optimize reports?

Business and Case Questions
81. How do you analyze a sales drop?
82. How do you define success metrics?
83. What business metrics have you worked on?
84. How do you prioritize insights?
85. How do you validate insights?
86. What questions do you ask stakeholders?
87. How do you handle vague requirements?
88. How do you measure business impact?
89. How do you explain numbers to managers?
90. How do you recommend actions?

Projects and Real World
91. Explain your best project.
92. What data sources did you use?
93. How did you clean the data?
94. What insight had the most impact?
95. What challenge did you face?
96. How did you solve it?
97. How did stakeholders use your dashboard?
98. What would you improve in your project?
99. How do you handle tight deadlines?
100. Why should we hire you as a data analyst?

Double Tap ♥️ For Detailed Answers

🚀 How to Land a Data Analyst Job Without Experience?

Many people asked me this question, so I thought to answer it here to help everyone. Here is the step-by-step approach i would recommend:

✅ Step 1: Master the Essential Skills

You need to build a strong foundation in:

🔹 SQL – Learn how to extract and manipulate data
🔹 Excel – Master formulas, Pivot Tables, and dashboards
🔹 Python – Focus on Pandas, NumPy, and Matplotlib for data analysis
🔹 Power BI/Tableau – Learn to create interactive dashboards
🔹 Statistics & Business Acumen – Understand data trends and insights

Where to learn?
📌 Google Data Analytics Course
📌 SQL – Mode Analytics (Free)
📌 Python – Kaggle or DataCamp


✅ Step 2: Work on Real-World Projects

Employers care more about what you can do rather than just your degree. Build 3-4 projects to showcase your skills.

🔹 Project Ideas:

✅ Analyze sales data to find profitable products
✅ Clean messy datasets using SQL or Python
✅ Build an interactive Power BI dashboard
✅ Predict customer churn using machine learning (optional)

Use Kaggle, Data.gov, or Google Dataset Search to find free datasets!


✅ Step 3: Build an Impressive Portfolio

Once you have projects, showcase them! Create:
📌 A GitHub repository to store your SQL/Python code
📌 A Tableau or Power BI Public Profile for dashboards
📌 A Medium or LinkedIn post explaining your projects

A strong portfolio = More job opportunities! 💡


✅ Step 4: Get Hands-On Experience

If you don’t have experience, create your own!
📌 Do freelance projects on Upwork/Fiverr
📌 Join an internship or volunteer for NGOs
📌 Participate in Kaggle competitions
📌 Contribute to open-source projects

Real-world practice > Theoretical knowledge!


✅ Step 5: Optimize Your Resume & LinkedIn Profile

Your resume should highlight:
✔️ Skills (SQL, Python, Power BI, etc.)
✔️ Projects (Brief descriptions with links)
✔️ Certifications (Google Data Analytics, Coursera, etc.)

Bonus Tip:
🔹 Write "Data Analyst in Training" on LinkedIn
🔹 Start posting insights from your learning journey
🔹 Engage with recruiters & join LinkedIn groups


✅ Step 6: Start Applying for Jobs

Don’t wait for the perfect job—start applying!
📌 Apply on LinkedIn, Indeed, and company websites
📌 Network with professionals in the industry
📌 Be ready for SQL & Excel assessments

Pro Tip: Even if you don’t meet 100% of the job requirements, apply anyway! Many companies are open to hiring self-taught analysts.

You don’t need a fancy degree to become a Data Analyst. Skills + Projects + Networking = Your job offer!

🔥 Your Challenge: Start your first project today and track your progress!

Share with credits: https://t.me/sqlspecialist

Hope it helps :)

🧠 Advanced SQL Interview Question ⚡

📊 Find the top 3 highest-paid employees from each department

Table: Employees

employee_id | employee_name
| department_id | salary

🔍 Query:

WITH ranked AS (
SELECT employee_id,
employee_name,
department_id,
salary,
DENSE_RANK() OVER (
PARTITION BY department_id
ORDER BY salary DESC
) AS rnk
FROM Employees
)
SELECT *
FROM ranked
WHERE rnk <= 3;

🎯 Why this question matters:

✅ Tests window functions (DENSE_RANK)
✅ Evaluates partitioning concepts
✅ Checks top-N problem-solving skills
✅ Frequently asked in advanced SQL interviews

🚀 Pro Tip:

Use DENSE_RANK() instead of ROW_NUMBER() when you want to handle salary ties correctly.

🔥 Top-N per group questions are extremely popular in Data Analyst interviews.

❤️ React for more advanced SQL interview questions

🧠 Advanced SQL Interview Question ⚡

📊 Find customers who placed orders in every month of 2025

Table: Orders

customer_id | order_date

🔍 Query:

SELECT customer_id
FROM Orders
WHERE YEAR(order_date) = 2025
GROUP BY customer_id
HAVING COUNT(DISTINCT MONTH(order_date)) = 12;

🎯 Why this question matters:

✅ Tests GROUP BY + HAVING concepts
✅ Uses DISTINCT counting logic
✅ Evaluates date function knowledge

🚀 Pro Tip:

✅ COUNT(DISTINCT ...) is commonly used in retention & activity analysis

✅ Month-wise activity questions are very common in analytics interviews

🔥 React ❤️ for more advanced SQL interview questions

A practical roadmap for becoming a data analyst in 2026 👇

① Learn Excel fundamentals
- formulas
- pivot tables
- data cleaning
- dashboards

② Start with basic SQL
- SELECT
- WHERE
- GROUP BY
- JOINS

③ Learn basic Microsoft Power BI
- charts
- reports
- simple dashboards

④ Improve your SQL skills
- CTEs
- window functions
- subqueries
- performance basics

⑤ Move into intermediate Power BI
- DAX
- data modeling
- interactive dashboards

⑥ Build projects and publish your work on GitHub

⑦ Start applying before you feel fully ready

A lot of people stay stuck in “learning mode” too long.

Projects, consistency, and practical experience usually teach faster than endless tutorials.

Double Tap ❤️ For More

Data Analyst Interview Questions & Preparation Tips

Be prepared with a mix of technical, analytical, and business-oriented interview questions.

1. Technical Questions (Data Analysis & Reporting)

SQL Questions:

How do you write a query to fetch the top 5 highest revenue-generating customers?

Explain the difference between INNER JOIN, LEFT JOIN, and FULL OUTER JOIN.

How would you optimize a slow-running query?

What are CTEs and when would you use them?

Data Visualization (Power BI / Tableau / Excel)

How would you create a dashboard to track key performance metrics?

Explain the difference between measures and calculated columns in Power BI.

How do you handle missing data in Tableau?

What are DAX functions, and can you give an example?

ETL & Data Processing (Alteryx, Power BI, Excel)

What is ETL, and how does it relate to BI?

Have you used Alteryx for data transformation? Explain a complex workflow you built.

How do you automate reporting using Power Query in Excel?


2. Business and Analytical Questions

How do you define KPIs for a business process?

Give an example of how you used data to drive a business decision.

How would you identify cost-saving opportunities in a reporting process?

Explain a time when your report uncovered a hidden business insight.


3. Scenario-Based & Behavioral Questions

Stakeholder Management:

How do you handle a situation where different business units have conflicting reporting requirements?

How do you explain complex data insights to non-technical stakeholders?

Problem-Solving & Debugging:

What would you do if your report is showing incorrect numbers?

How do you ensure the accuracy of a new KPI you introduced?

Project Management & Process Improvement:

Have you led a project to automate or improve a reporting process?

What steps do you take to ensure the timely delivery of reports?


4. Industry-Specific Questions (Credit Reporting & Financial Services)

What are some key credit risk metrics used in financial services?

How would you analyze trends in customer credit behavior?

How do you ensure compliance and data security in reporting?


5. General HR Questions

Why do you want to work at this company?

Tell me about a challenging project and how you handled it.

What are your strengths and weaknesses?

Where do you see yourself in five years?

How to Prepare?

Brush up on SQL, Power BI, and ETL tools (especially Alteryx).

Learn about key financial and credit reporting metrics.(varies company to company)

Practice explaining data-driven insights in a business-friendly manner.

Be ready to showcase problem-solving skills with real-world examples.

React with ❤️ if you want me to also post sample answer for the above questions

Share with credits: https://t.me/sqlspecialist

Hope it helps :)

✅ Power BI Interview Questions 🎯📊

1️⃣ What is Power BI?
A Microsoft tool for data visualization, reporting, and business intelligence.

2️⃣ What are the building blocks of Power BI?
• Datasets
• Reports
• Dashboards
• Tiles
• Visualizations

3️⃣ Difference between Power BI Desktop and Power BI Service?
• Desktop: Used to create and design reports
• Service: Cloud-based platform to share and collaborate

4️⃣ What is Power Query?
A data transformation tool for cleaning and shaping data before loading into the model.

5️⃣ What is DAX?
Data Analysis Expressions – a formula language used for calculations in Power BI.

6️⃣ What are measures and calculated columns?
• Measure: Calculated on aggregation (e.g. SUM of sales)
• Calculated Column: Row-level computation (e.g. profit = revenue - cost)

7️⃣ What is a slicer?
A visual filter that allows users to dynamically filter data on a report.

8️⃣ How do you handle data refresh in Power BI?
• Schedule refresh via Power BI Service
• Use gateways for on-prem data sources

9️⃣ What is the difference between direct query and import mode?
• Import: Data is loaded into Power BI
• Direct Query: Queries run directly on the source in real time

🔟 What is the Power BI Gateway?
A bridge between on-premise data sources and Power BI cloud service.

💬 Tap ❤️ for more

📊 Power BI Interview Q&A You Must Know 💡

1️⃣ What is the difference between a calculated column and a measure in Power BI?

✅ Calculated Column → Computed row by row and stored in the model

✅ Measure → Calculated dynamically based on filters and visuals

2️⃣ What is DAX in Power BI?

✅ DAX (Data Analysis Expressions) is the formula language used in Power BI for calculations and data analysis.

📌 Used for:
• Measures
• Calculated Columns
• Calculated Tables

3️⃣ What is the difference between Import Mode and DirectQuery?

✅ Import Mode → Loads data into Power BI for faster performance

✅ DirectQuery → Queries data directly from the source in real time

💡 Import is faster, DirectQuery is useful for huge/live datasets.

4️⃣ What are relationships in Power BI?

✅ Relationships connect tables using common columns.

📌 Types:
• One-to-One
• One-to-Many
• Many-to-Many

💡 Correct relationships are essential for accurate reports.

5️⃣ What is the use of Power Query?

✅ Power Query is used for:
• Cleaning data
• Transforming data
• Removing duplicates
• Merging tables
• Automating preprocessing steps

💡 Most real-world BI projects spend major time in data cleaning.

React ♥️ for more interview questions

📊 Power BI Interview Q&A You Must Know 💡 (Part 2)

6️⃣ What is a Star Schema in Power BI?

✅ Star Schema is a data modeling structure where:

📌 Fact Table → Stores measurable data
📌 Dimension Tables → Store descriptive information

7️⃣ What is the difference between SUM and SUMX in DAX?

✅ SUM → Adds values from a single column

✅ SUMX → Evaluates an expression row by row, then sums the result

8️⃣ What are slicers in Power BI?

✅ Slicers are visual filters that allow users to interactively filter report data.

📌 Commonly used for:
• Date filtering
• Category selection
• Region/Product filtering

9️⃣ What is the difference between COUNT and DISTINCTCOUNT?

✅ COUNT → Counts all non-empty rows

✅ DISTINCTCOUNT → Counts only unique values

🔟 What is Row-Level Security (RLS) in Power BI?

✅ RLS restricts data access for specific users.

📌 Example:
• Managers can view all data
• Employees can view only their department data

React ♥️ for more interview questions

📊 Top 5 Data Analyst Interview Q&A You Should Know 🚀

1️⃣ What is the difference between SQL JOIN and UNION?

✅ JOIN combines columns from multiple tables based on a related key.

✅ UNION combines rows from multiple queries into a single result set.

---

2️⃣ What is the difference between a Measure and a Calculated Column in Power BI?

✅ Calculated Column → Computed row by row and stored in the model.

✅ Measure → Calculated dynamically based on filters and visuals.

⚡ Measures are more memory efficient and commonly used in dashboards.

---

3️⃣ What is the purpose of GROUP BY in SQL?

✅ GROUP BY is used to aggregate data based on one or more columns.

📌 Commonly used with:
• COUNT()
• SUM()
• AVG()
• MAX()
• MIN()

---

4️⃣ What is ETL in Data Analytics?

✅ ETL = Extract, Transform, Load

📥 Extract → Collect data from sources
🔄 Transform → Clean & process data
📤 Load → Store data into database/warehouse

---

5️⃣ What is the difference between WHERE and HAVING in SQL?

✅ WHERE filters rows before aggregation.

✅ HAVING filters grouped/aggregated data after aggregation.

React ♥️ for more interview questions

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✅ Data Analytics Roadmap for Freshers 🚀📊

1️⃣ Understand What a Data Analyst Does
🔍 Analyze data, find insights, create dashboards, support business decisions.

2️⃣ Start with Excel
📈 Learn:
– Basic formulas
– Charts & Pivot Tables
– Data cleaning
💡 Excel is still the #1 tool in many companies.

3️⃣ Learn SQL
🧩 SQL helps you pull and analyze data from databases.
Start with:
– SELECT, WHERE, JOIN, GROUP BY
🛠️ Practice on platforms like W3Schools or Mode Analytics.

4️⃣ Pick a Programming Language
🐍 Start with Python (easier) or R
– Learn pandas, matplotlib, numpy
– Do small projects (e.g. analyze sales data)

5️⃣ Data Visualization Tools
📊 Learn:
– Power BI or Tableau
– Build simple dashboards
💡 Start with free versions or YouTube tutorials.

6️⃣ Practice with Real Data
🔍 Use sites like Kaggle or Data.gov
– Clean, analyze, visualize
– Try small case studies (sales report, customer trends)

7️⃣ Create a Portfolio
💻 Share projects on:
– GitHub
– Notion or a simple website
📌 Add visuals + brief explanations of your insights.

8️⃣ Improve Soft Skills
🗣️ Focus on:
– Presenting data in simple words
– Asking good questions
– Thinking critically about patterns

9️⃣ Certifications to Stand Out
🎓 Try:
– Google Data Analytics (Coursera)
– IBM Data Analyst
– LinkedIn Learning basics

🔟 Apply for Internships & Entry Jobs
🎯 Titles to look for:
– Data Analyst (Intern)
– Junior Analyst
– Business Analyst

💬 React ❤️ for more!

🚀 5 Frequently Asked SQL Interview Q&A 💻📊

1️⃣ Difference between RANK() and DENSE_RANK()?

✅ RANK() skips numbers after ties
✅ DENSE_RANK() does not skip numbers

Example: 95, 95, 90
RANK() → 1,1,3
DENSE_RANK() → 1,1,2

—

2️⃣ What is a Window Function?

📈 Performs calculations across rows without grouping them into one row.

Examples:
✔️ ROW_NUMBER()
✔️ RANK()
✔️ LEAD()
✔️ LAG()

—

3️⃣ ROW_NUMBER() vs RANK()?

🔢 ROW_NUMBER() gives unique numbers to every row.
🔢 RANK() gives same rank to duplicate values.

—

4️⃣ What is a Stored Procedure?

⚙️ A saved SQL query that can be reused anytime.

Benefits:
✅ Reusable
✅ Faster execution
✅ Better security

—

5️⃣ WHERE vs GROUP BY?

📌 WHERE filters rows
📌 GROUP BY groups rows for aggregation

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🧠 Advance SQL Interview Question ⚡

📊 Find the department with the highest total salary expense

Table: Employees

Columns:

employee_id , employee_name , department_id , salary

🔍 Query:

WITH dept_salary AS (
SELECT department_id,
SUM(salary) AS total_salary
FROM Employees
GROUP BY department_id
)

SELECT department_id,
total_salary
FROM dept_salary
WHERE total_salary = (
SELECT MAX(total_salary)
FROM dept_salary
);

🎯 Why this question matters:

✅ Tests CTE + aggregation concepts
✅ Evaluates nested subquery understanding

🚀 Pro Tip:

Using a CTE first makes complex aggregate queries much cleaner and easier to debug.

🔥 React ❤️ for more advanced SQL interview questions 🚀

✅ Top Data Analyst Interview Q&A 🎯

1. How do you handle messy or incomplete data in a real project
Answer:
I start by profiling the dataset to identify missing values, duplicates, and inconsistent formats. Depending on the context, I may impute missing values using mean/median, flag them for review, or exclude them if they’re not critical. For example, in an HR dataset, I used pandas to standardize date formats and fill missing department fields based on role titles.

2. Describe a time you built a dashboard that influenced a business decision
Answer:
At my previous role, I built a Power BI dashboard to track churn across customer segments. It revealed that users from a specific region had a 30% higher churn rate. This insight led the marketing team to launch a targeted retention campaign, reducing churn by 12% in the next quarter.

3. How do you approach a vague business question like “Why are sales dropping”
Answer:
I break it down by segmenting data—region, product, time period—and look for anomalies or trends. I compare current vs. previous periods, analyze customer behavior, and check for external factors. In one case, I discovered that a drop in sales was due to a discontinued product line that hadn’t been flagged in reporting.

4. What’s your process for analyzing an A/B test
Answer:
I define the hypothesis, ensure randomization, and check sample sizes. Then I compare metrics like conversion rate between control and test groups using statistical tests (e.g., t-test or chi-square). I also calculate p-values and confidence intervals to determine significance. I once helped a product team validate a new checkout flow that increased conversions by 8%.

5. How do you ensure your analysis is understandable to non-technical stakeholders
Answer:
I focus on clarity—use simple language, clean visuals, and highlight key takeaways. I avoid jargon and always tie insights to business impact. For example, instead of saying “standard deviation,” I might say “variation in customer spending.”

6. What tools do you use for forecasting and how do you validate your predictions
Answer:
I use Excel for quick models and Python’s statsmodels or Prophet for more robust forecasting. I validate predictions using historical data and metrics like RMSE or MAPE. In a recent project, I forecasted monthly sales and helped the inventory team reduce overstock by 15%.

7. How do you automate repetitive reporting tasks
Answer:
I use Python scripts with scheduled jobs or Power BI’s refresh features. In one case, I automated a weekly sales report using Google Sheets + Apps Script, saving 5 hours of manual work per week.

8. How do you prioritize multiple data requests from different teams
Answer:
I assess urgency, business impact, and effort required. I communicate clearly with stakeholders and use frameworks like ICE (Impact, Confidence, Effort) to align priorities. I also maintain a request tracker to manage expectations.

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🧠 Advanced SQL Interview Question ⚡

📊 Find pairs of employees who work in the same department and earn the same salary

Table: Employees

Columns:

employee_id, employee_name, department_id, salary

🔍 Query:

SELECT e1.employee_id AS emp1_id,
e1.employee_name AS emp1_name,
e2.employee_id AS emp2_id,
e2.employee_name AS emp2_name,
e1.department_id,
e1.salary
FROM Employees e1
JOIN Employees e2
ON e1.department_id = e2.department_id
AND e1.salary = e2.salary
AND e1.employee_id < e2.employee_id;

🎯 Why this question matters:

✅ Tests self joins deeply
✅ Evaluates logical thinking in SQL
✅ Commonly asked in advanced interview rounds

🚀 Pro Tip:

Self joins are extremely useful for comparing rows within the same table without using loops.

🔥 React ❤️ for more advanced SQL interview questions 🚀

Data Analysis Interview Questions

1. What is the difference between Primary Key and Foreign Key? (SQL Basics)
2. Write a query to find the second highest salary in the Employee table.
3. How do you handle missing values in a dataset? (Data Cleaning)
4. What is the difference between COUNT(*), COUNT(column), and COUNT(DISTINCT column)?
5. What are measures of central tendency in statistics? (Stats Basics)
6. What is a window function in SQL? Provide examples of ROW_NUMBER and RANK.
7. Write a query to fetch the top 3 performing products based on sales.
8. Explain the difference between UNION and UNION ALL.
9. Explain p-value in hypothesis testing. (Statistics)
10. How would you detect outliers in a dataset? (EDA)
11. Write a query to get the top 3 departments with the highest average salary. (SQL + Aggregation)
12. What is correlation? How do you interpret it? (Statistics)
13. Explain the difference between DELETE and TRUNCATE commands.
14. What are KPIs? Give examples for an e-commerce company. (Business)
15. How do you calculate a running total in SQL? (Window Functions – Advanced SQL)
16. Explain the difference between Correlation and Regression. (Stats)
17. How do you handle imbalanced datasets in classification problems? (ML + Analytics)
18. How would you design an A/B test for a new pricing model? (Experiment Design)
19. How would you detect anomalies in financial transactions? (Real-World Case)


Data Analysis/Scenario-Based Questions

20. Write a query to identify the most profitable regions based on transaction data.
21. How would you analyze customer churn using SQL?
22. Explain the difference between OLAP and OLTP databases.
23. How would you determine the Average Revenue Per User (ARPU) from transaction data?
24. Describe a scenario where you would use a LEFT JOIN instead of an INNER JOIN.
25. Write a query to calculate YoY (Year-over-Year) growth for a set of transactions.
26. How would you implement fraud detection using transactional data?
27. Write a query to find customers who have used more than 2 credit cards for transactions in a given month.
28. How would you approach a business problem where you need to analyze the spending patterns of premium customers?

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