Dish Network Lead Data Scientist Interview Questions and Answers

Q1. SQL joins and simple query
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Q2. Phython basics and simle data fram
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Q3. Hr round only formality
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Q1. Qualification of my degree
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Q2. My personal skills for company
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Average type questions.

Q1. About the domain/fields or have any experienced or what u did there
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Q1. Self introduction
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Q1. Difference between joins
Ans. 
Joins are used to combine rows from two or more tables based on a related column between them.
• Inner Join: Returns rows when there is a match in both tables.

• Left Join: Returns all rows from the left table and the matched rows from the right table.

• Right Join: Returns all rows from the right table and the matched rows from the left table.

• Full Outer Join: Returns rows when there is a match in one of the tables.

• Cross Join:
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Q2. Window function
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Q1. Write sql query in pythons
Ans. 
Writing SQL queries in Python allows for seamless integration of data analysis and manipulation.
• Use libraries like pandas or sqlalchemy to execute SQL queries in Python

• Remember to establish a connection to the database before executing queries

• Utilize Python's flexibility to manipulate and analyze data retrieved from SQL queries
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Easy Aptitude and SQL questions

Q1. Guesstimate question
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Q2. SQL Joins and DSA
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Q1. Could you elaborate on your roles and responsibilities in your previous employment?
Ans. 
In my previous role, I was responsible for analyzing data, creating reports, and providing insights to support decision-making.
• Performed data cleaning, transformation, and analysis using tools like Excel, SQL, and Python.

• Generated reports and dashboards to visualize data trends and patterns.

• Collaborated with cross-functional teams to identify key metrics and KPIs for business performance.

• Presented findings and recommen...read more
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Q2. What was your role in the project, specifically related to data transformation and dashboard creation?
Ans. 
I was responsible for data cleaning, transformation, and visualization to create interactive dashboards for stakeholders.
• Performed data cleaning and transformation to ensure accuracy and consistency of data

• Utilized tools like SQL, Python, and Tableau to manipulate and visualize data

• Collaborated with stakeholders to understand their requirements and design interactive dashboards

• Generated insights from data analysis to d
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Q3. How do you optimize and manage large datasets, and what data sources do you utilize to obtain this data?
Ans. 
I optimize and manage large datasets by using tools like SQL, Python, and Excel. I utilize various data sources such as databases, APIs, and web scraping.
• Utilize SQL queries to efficiently extract and manipulate data from databases

• Use Python for data cleaning, analysis, and visualization tasks

• Leverage Excel for organizing and summarizing data in a user-friendly format

• Obtain data from sources like internal databases, ex
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Q4. Guesstimates like how many traffic signals are there in Noida.
Ans. 
There are approximately 500-600 traffic signals in Noida.
• Estimate based on the size and population of Noida

• Consider the number of major intersections and roads in the city

• Take into account the traffic density and need for traffic management

• Consult local traffic authorities for more accurate data
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Q5. The interviewer asked SQL questions related to window functions, joins, and advanced aggregations, such as running sum and rolling sum.
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Q1. Second round is also a technical round and similar to first round . Medium to high level sql questions and questions related to the project you're working on and Guesstimates will be asked by the interview...read more
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Q1. Project manager will take the third round interview and inquire about your knowledge of the company, and some technical and scenario-based questions related to decision-making and problem-solving approach.
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Q1. Final round will be an HR round.
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Q1. Good interview with no mistakes.
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Q2. Why you want to work with us ?
Ans. 
I want to work with you because of your reputation in the industry and the exciting opportunities for growth and learning.
• I am impressed by your company's reputation in the industry and the positive feedback I have heard from current and former employees.

• Your organization offers a dynamic and challenging work environment, which aligns with my career goals and aspirations.

• I am excited about the opportunity to work with ...read more
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Q1. Electronic base question
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Q2. Electronic base question
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Q3. Computer base question
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