Graphene 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. Can you handle the situation if vendor payment not done for company side .
Ans. 
Yes, I have experience handling vendor payments and can address the situation effectively.
• I have experience in managing vendor relationships and ensuring timely payments.

• I would first investigate the reason for the missed payment, whether it was an oversight or a dispute with the vendor.

• I would communicate with the vendor to explain the situation and work towards a resolution, such as negotiating a new payment schedule...read more
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Q2. How to identify the root cause of supply not done
Ans. 
Identifying the root cause of supply not done involves analyzing processes, communication, and potential obstacles.
• Review the supply chain process from start to finish to identify any bottlenecks or inefficiencies

• Communicate with team members involved in the supply process to gather information on any issues or challenges faced

• Check for any external factors such as supplier delays or transportation issues that may be c...read more
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How to maintain the store ? And How remove the bad stock?

Q1. How to maintain the store
Ans. 
Maintaining the store involves ensuring cleanliness, organization, inventory management, and customer satisfaction.
• Regularly clean and organize the store to create a welcoming environment for customers

• Implement efficient inventory management practices to avoid stockouts and overstocking

• Train and motivate staff to provide excellent customer service

• Monitor sales trends and adjust product displays accordingly

• Regularly ins...read more
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Q2. How to remove the bad stock
Ans. 
To remove bad stock, conduct regular inventory audits, identify slow-moving items, negotiate with suppliers for returns or exchanges, and implement a clearance sale strategy.
• Conduct regular inventory audits to identify bad stock

• Identify slow-moving items and take necessary actions

• Negotiate with suppliers for returns or exchanges

• Implement a clearance sale strategy to move out bad stock quickly
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Asked to write different SQL queries.
1. Moving average of lf previous 10 days
2. For a data which records in and out time of an employee. How many employees were present in the office at a given time
3. A/B testing vs pre-post testing

1. Had to come up with a method to give a score to each user based on FRM(frequency, recency, monetory)
2. Guesstimate: how many burgers does McD sells in a day

Q1. Code postorder traversal without using recursion.
Ans. 
Iterative solution using a stack to perform postorder traversal.
• Use a stack to simulate the recursive call stack.

• Push nodes in the order of right, left, root.

• Pop nodes from stack and add to result array.

• Repeat until stack is empty.
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Q2. Leetcode Problem 1626 - Best team with no conflicts.
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Q1. Design whatsapp with one to one, group messaging and read receipts functionalities. Design the database.
Ans. 
Design a messaging app like WhatsApp with one-to-one, group messaging, and read receipts functionalities.
• Use a relational database to store user information, messages, and group memberships.

• Create tables for users, messages, groups, and group memberships.

• Include columns for message content, sender, receiver, timestamp, and read status.

• Implement a feature to mark messages as read with read receipts.

• Use indexes for effic
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Q2. Questions on dbms, cn and os.
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Q1. How do you setup a Dark Store?
Ans. 
Setting up a Dark Store involves converting a retail store into a fulfillment center for online orders.
• Select a suitable location for the Dark Store, preferably in a centralized area with good access to transportation.

• Optimize the layout of the store for efficient picking, packing, and shipping of orders.

• Implement inventory management systems to track stock levels accurately and prevent stockouts.

• Train staff on order f...read more
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Q2. How do joins work in the simplest manner?
Ans. 
Joins combine data from two or more tables based on a related column.
• Joins are used to retrieve data from multiple tables based on a related column

• Common types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

• Example: SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.id
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Q3. Write a basic query explaining the order of execution?
Ans. 
The order of execution in a query determines the sequence in which operations are performed.
• 1. The order of execution in a query typically follows the sequence: FROM, WHERE, GROUP BY, HAVING, SELECT, ORDER BY.

• 2. The FROM clause specifies the tables involved in the query.

• 3. The WHERE clause filters the rows based on specified conditions.

• 4. The GROUP BY clause groups the rows that have the same values into summary rows.

• 5...read more
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Q4. Difference between Group By and Distinct?
Ans. 
Group By is used to aggregate data based on a specific column, while Distinct is used to remove duplicate rows from a result set.
• Group By is used with aggregate functions like COUNT, SUM, AVG, etc.

• Distinct is used to retrieve unique values from a column or set of columns.

• Group By can be used to group data based on multiple columns, while Distinct operates on individual columns only.
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Q1. Tell me about yourself.
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