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Skillz Data Analyst Interview Questions and Answers
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1 interview found
Anonymous
A problem space was given with the list of metric and access to data with respect to the skillz free games
Had to answer the questions and perform an EDA and suggest recommendations
SQL question were asked
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I applied via Naukri.com and was interviewed in Nov 2024. There was 1 interview round.
(2 Questions)
- Q1. What is the difference between Union and Union all ?
- Ans.
Union combines the results of two or more SELECT statements, while Union all includes all rows, including duplicates.
Union removes duplicate rows from the result set, while Union all includes all rows.
Union sorts the result set, while Union all does not.
Union is slower than Union all because it performs a distinct operation.
Example: SELECT column1 FROM table1 UNION SELECT column1 FROM table2;
Example: SELECT column1 FRO
- Q2. Which query is more faster , joins or union?
- Ans.
Joins are generally faster than unions.
Joins are typically faster than unions because they combine data from multiple tables based on a common column, while unions combine data from multiple queries into a single result set.
Joins can utilize indexes on the columns being joined, which can improve performance.
Unions involve combining the results of multiple queries, which can be slower as it requires merging and sorting ...
Interview Preparation Tips
- SQL
- Power BI
I applied via Company Website and was interviewed in Dec 2019. There were 4 interview rounds.
Interview Questionnaire
3 Questions
- Q1. Questions were mostly asked on SQL, Python libraries, Machine learning and Excel, puzzles to solve before interview there was test case study to solve.
- Q2. What is row number, rank, dense rank? explain partition by, indexing joins, query optimization techniques
- Ans.
Explanation of row number, rank, dense rank, partition by, indexing joins, and query optimization techniques.
Row number is a function that assigns a unique number to each row in a result set.
Rank is a function that assigns a rank to each row based on the values in a specified column.
Dense rank is a function that assigns a rank to each row based on the values in a specified column, but with no gaps in the ranking.
Partit...
- Q3. Real-time examples on data analytics with examples
- Ans.
Real-time examples of data analytics
Predictive maintenance in manufacturing
Real-time fraud detection in banking
Personalized recommendations in e-commerce
Real-time traffic analysis for smart cities
Real-time health monitoring in medical devices
Skills evaluated in this interview
Data Analyst Intern Interview Questions & Answers
Mobile Premier League
Nayan Bhatt
posted on 14 Jan 2025
I applied via Company Website and was interviewed in Dec 2024. There was 1 interview round.
(2 Questions)
- Q1. Leetcode sql question
- Q2. "Pandas and NumPy question."
Interview Preparation Tips
I applied via Naukri.com and was interviewed in Nov 2024. There was 1 interview round.
(2 Questions)
- Q1. What is the difference between Union and Union all ?
- Ans.
Union combines the results of two or more SELECT statements, while Union all includes all rows, including duplicates.
Union removes duplicate rows from the result set, while Union all includes all rows.
Union sorts the result set, while Union all does not.
Union is slower than Union all because it performs a distinct operation.
Example: SELECT column1 FROM table1 UNION SELECT column1 FROM table2;
Example: SELECT column1 FRO
- Q2. Which query is more faster , joins or union?
- Ans.
Joins are generally faster than unions.
Joins are typically faster than unions because they combine data from multiple tables based on a common column, while unions combine data from multiple queries into a single result set.
Joins can utilize indexes on the columns being joined, which can improve performance.
Unions involve combining the results of multiple queries, which can be slower as it requires merging and sorting ...
Interview Preparation Tips
- SQL
- Power BI
I applied via Company Website and was interviewed in Dec 2019. There were 4 interview rounds.
Interview Questionnaire
3 Questions
- Q1. Questions were mostly asked on SQL, Python libraries, Machine learning and Excel, puzzles to solve before interview there was test case study to solve.
- Q2. What is row number, rank, dense rank? explain partition by, indexing joins, query optimization techniques
- Ans.
Explanation of row number, rank, dense rank, partition by, indexing joins, and query optimization techniques.
Row number is a function that assigns a unique number to each row in a result set.
Rank is a function that assigns a rank to each row based on the values in a specified column.
Dense rank is a function that assigns a rank to each row based on the values in a specified column, but with no gaps in the ranking.
Partit...
- Q3. Real-time examples on data analytics with examples
- Ans.
Real-time examples of data analytics
Predictive maintenance in manufacturing
Real-time fraud detection in banking
Personalized recommendations in e-commerce
Real-time traffic analysis for smart cities
Real-time health monitoring in medical devices
Skills evaluated in this interview
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