Marsh Senior Data Analyst Interview Questions and Answers

Questions from arrays and strings and some aptitude questions

Q1. How to merge 2 csv files
Ans. 
To merge two CSV files, you can use software like Microsoft Excel or programming languages like Python.
• Open both CSV files in a software like Microsoft Excel.

• Copy the data from one CSV file and paste it into the other CSV file.

• Save the merged CSV file with a new name.

• Alternatively, you can use programming languages like Python to merge CSV files by reading both files, combining the data, and writing to a new file.
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Q2. Basic questions on arrays
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Q1. 3 reasons why u choose this company
Ans. 
I applied to this company because of its reputation in the industry, opportunities for growth, and company culture.
• Reputation in the industry - I have heard great things about the company's innovative projects and successful track record.

• Opportunities for growth - The company offers various training programs and career advancement opportunities for employees.

• Company culture - I value a positive work environment and the...read more
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Q1. Questions on python
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Q1. KPIs used in the project
Ans. 
Key Performance Indicators (KPIs) are metrics used to evaluate the success of a project.
• KPIs are specific, measurable, achievable, relevant, and time-bound metrics used to track progress towards project goals.

• Examples of KPIs in a data analysis project could include data accuracy, completion time, client satisfaction, and cost savings.

• KPIs help in monitoring and improving the performance of the project team and ensurin
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Q1. Number of rows and columns that can be uploaded in Power BI
Ans. 
Power BI allows uploading up to 1 million rows and 1,500 columns in a dataset.
• Power BI allows uploading a maximum of 1 million rows in a dataset.

• Power BI allows uploading a maximum of 1,500 columns in a dataset.

• Exceeding these limits may result in performance issues.
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Q1. Describe your weakness and strengths
Ans. 
My weakness is overthinking, but my strengths include attention to detail, problem-solving skills, and strong analytical abilities.
• Weakness: tend to overthink situations, which can sometimes lead to indecision

• Strengths: attention to detail, able to identify patterns and trends, strong problem-solving skills, excellent analytical abilities
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Basic 10 apti question

Basic 5 python question

Basic 5 SQL question

Q1. They asked two python program.
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Q1. They asked one SQL question
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Q1. Just question based on my resume.
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Q1. Regularizaion, model improvemnts
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Q2. Hyperparameter tuning
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Q1. Tell me about yourself
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Q2. Tell me a time when you had to deal with a failure, how you tackled it
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5 sql coding questions from hacker rank. Basic sql questions, if you are experienced you will solve them in 15 to 20 min

Q1. How do you seperate name from emails for example *****,***** etc.. We need to get name form those mails in sql
Ans. 
Use SQL string functions like SUBSTRING and CHARINDEX to separate name from emails.
• Use CHARINDEX to find the position of the '@' symbol in the email address.

• Use SUBSTRING to extract the characters before the '@' symbol as the name.

• Consider handling cases where there are multiple names or special characters in the email address.
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Q2. There is a table matches which has team 1,team 2 and winner columns. Sample data like ind pak pak and pak ind ind and sl ban sl. So a team can play mutliple matches. Final output should be team, no of matc...read more
Ans. 
Calculate the number of matches won and lost by each team based on the given data in the matches table.
• Group the data by team and count the number of matches won and lost for each team.

• Use the winner column to determine the outcome of each match.

• Create a query to calculate the number of matches won and lost for each team.

• Example: Team A won 2 matches and lost 1 match.

• Example: Team B won 1 match and lost 2 matches.
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Q3. Table a has 1, 1,0,0,null and table b has 1,0,null,null. Resultant rows for all joins
Ans. 
The resultant rows for all joins between table a and table b with given values.
• Inner join: 1

• Left join: 1, 1, 0, 0, null

• Right join: 1, 0, null, null

• Full outer join: 1, 1, 0, 0, null, null
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Q4. Explain primary and secondary indexing. And more questions on indexing
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Q1. Explain about your projects
Ans. 
I have worked on various projects involving data analysis, visualization, and predictive modeling.
• Developed predictive models to forecast sales trends and customer behavior

• Created interactive dashboards using Tableau for data visualization

• Performed data cleaning and preprocessing to ensure accuracy and consistency

• Utilized machine learning algorithms such as regression and clustering for analysis

• Collaborated with cross-...read more
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Q2. Follow up questions on projects
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Q3. Write a query to seperate first name, midle name and last name from full name in sql
Ans. 
Use SUBSTRING_INDEX function in SQL to separate first name, middle name, and last name from full name.
• Use SUBSTRING_INDEX function to extract first name by specifying space as delimiter

• Use SUBSTRING_INDEX function to extract last name by specifying space as delimiter and -1 as position

• Use combination of SUBSTRING_INDEX and REPLACE functions to extract middle name if present
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Build a simple cat and dog image classifier

Q1. ML related questions
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Q1. Behavioural questions, basically to check if you will be fit in a team
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