Chubb Senior Data Analyst Interview Questions and Answers

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
Ans. 
Discussed various projects showcasing data analysis skills and methodologies used to derive insights.
• Utilized SQL for data extraction in a sales analysis project, leading to a 15% increase in revenue.

• Implemented machine learning models to predict customer churn, achieving an accuracy of 85%.

• Created interactive dashboards using Tableau to visualize key performance indicators for stakeholders.

• Conducted A/B testing for a ...read more
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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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