What are the key technical skills for a Data Analyst?

Proficiency in SQL, Excel, and data visualization tools like Tableau or Power BI. Familiarity with Python or R for statistical analysis is a plus.

How do you write a SQL query to find the second highest salary?

Use the LIMIT and ORDER BY clauses: SELECT salary FROM employees ORDER BY salary DESC LIMIT 1 OFFSET 1;

What is data cleaning and why is it important?

Data cleaning involves removing errors and inconsistencies to ensure data quality. It's crucial for accurate analysis and reliable insights.

How do you handle missing data in a dataset?

Techniques include removing records, imputing values using mean/median/mode, or using algorithms that support missing values.

Ensure clarity, accuracy, and simplicity. Use appropriate chart types, maintain consistency, and avoid misleading scales.