I recently participated in an interview for the position of Data Analyst. The interview focused on my technical skills, analytical thinking, and ability to derive insights from raw data. The interviewer asked questions about data cleaning, visualization techniques, and my experience with tools like SQL, Excel, Python (Pandas, NumPy), and BI platforms such as Power BI or Tableau. They were also interested in my understanding of basic statistical concepts and problem-solving approaches.
Can you explain the difference between inner join, left join, and right join in SQL?
Which libraries in Python do you commonly use for data analysis, and why?
How would you optimize a slow-running SQL query?
This experience was shared anonymously to help others prepare for their interviews.