Games24x7 Data Analyst 2 Interview Questions and Answers

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
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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 ...read more
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Q1. Resume based questions on past experience
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Q2. Case study based questions
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Q1. Resume based questions,
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Q2. Moderate SQL Coding question
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Q3. Case study based questions
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Q1. General HR related questions
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Q1. Managerial & Aptitude questions
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Q1. Managerial discussion about role & industry
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Q1. How to read parquet and csv file in spark .
Ans. 
To read parquet and csv files in Spark, use SparkSession's read method with appropriate options.
• Create a SparkSession object

• Use the read method of SparkSession to read parquet files with .parquet() method

• Use the read method of SparkSession to read csv files with .csv() method

• Specify options like header, delimiter, inferSchema, etc. as needed

• Load the data into a DataFrame for further processing
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Q2. How to check second highest sallery.
Ans. 
To check the second highest salary, use the SQL query with ORDER BY and LIMIT.
• Use SQL query with ORDER BY clause to sort salaries in descending order.

• Use LIMIT 1,1 to select the second highest salary.

• Example: SELECT salary FROM employees ORDER BY salary DESC LIMIT 1,1
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Increase rev by 10% with a feature in gane of choice

Q1. Deconstruct a game, propose how to imporve rev for a product
Ans. 
Deconstructing a game to improve revenue for a product
• Analyze the game's monetization strategy, including in-app purchases, ads, and subscriptions

• Identify key metrics such as user retention, average revenue per user, and lifetime value

• Implement A/B testing to optimize pricing, promotions, and features

• Leverage data analytics to understand user behavior and preferences

• Consider partnerships with other apps or brands for c...read more
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Q1. How would you go about building game economics for a game?
Ans. 
Building game economics involves balancing in-game currency, rewards, and purchases to create a sustainable and engaging experience.
• Define the in-game currency and its value in relation to real money.

• Design a reward system that incentivizes player engagement and progression.

• Implement a balanced pricing strategy for in-game purchases to drive revenue without alienating players.

• Analyze player behavior and adjust the econ...read more
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Q1. There is one black king and N number of white knights. You need to find is king under attack and is checkmate?
Ans. 
Check if the black king is under attack and if it is checkmate.
• Check if any white knight can capture the black king

• Check if the black king has any legal moves to escape capture

• If the black king is under attack and has no legal moves, it is checkmate
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Topological Sort based question and it's follow up