Target Interview Questions and Answers for Freshers

Q1. 1. How do you mentor and guide a team that is lacking specific skills? 2. How do you handle conflicts in a team? 3. Have you ever worked with a difficult team member; how did you deal with him?
Ans. 
Effective mentoring and conflict resolution are key to fostering a productive team environment.
• Identify skill gaps through assessments and feedback, then create tailored training sessions.

• Encourage peer-to-peer learning by pairing less experienced members with skilled ones.

• Use real-world projects to apply new skills, enhancing both learning and team collaboration.

• Address conflicts early by facilitating open discussions...read more
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Q2. 4. What criteria do you consider when selecting a dataset for analysis? 5. What is an aggregation query that calculates the average salary for each department in an Employees table, excluding employees ear...read more
Ans. 
Key criteria for dataset selection, SQL aggregation, and JOIN queries for data analysis.
• 1. Relevance: Ensure the dataset aligns with the analysis objectives. Example: Analyzing sales trends requires sales data.

• 2. Quality: Check for missing values, duplicates, and inconsistencies. Example: A dataset with many null values may skew results.

• 3. Size: Consider the dataset's size for performance. Example: Large datasets may r...read more
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Q3. The interview concluded with me asking a few questions about the role and company culture. Overall, it was a structured interview. After 2 days, I received a positive feedback and selected for the role.
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Q1. It was hiring drive face to face interview
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Q2. Project related indepth discussions
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Q3. Medium level SQL and DSA
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Q4. Sorting colors DSA problem
Ans. 
Sort an array of colors in a specific order
• Use a custom sorting function to sort the colors based on a predefined order

• Map each color to a numerical value and sort based on that value

• Consider using a hashmap to store the order of colors
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Q5. In depth spark optimization question
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Q1. Data Structures and Algorithms - longest common prefix
Ans. 
Find the longest common prefix among an array of strings.
• Iterate through the characters of the first string.

• Compare each character with the corresponding character in other strings.

• Stop when a mismatch is found or the end of any string is reached.

• Example: For ['flower', 'flow', 'flight'], the longest common prefix is 'fl'.

• If no common prefix exists, return an empty string.
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Q2. Overlapping lists, follow up - with duplicates, with less space complexity
Ans. 
Identify overlapping elements in two lists with duplicates while minimizing space complexity.
• Use a hash map to count occurrences of elements in both lists.

• Iterate through the first list, checking counts in the hash map for overlaps.

• Example: For lists [1, 2, 2, 3] and [2, 2, 4], the overlap is [2, 2].

• Consider using a set to track seen elements for reduced space usage.

• Example: For lists [1, 2, 3] and [3, 4, 5], the overl...read more
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It was basically two leetcode Questions Mainly from array with some algorithm required to apply and other from LinkedList.

Q1. First the discussion was mainly on Projects you have worked on for first 20 minutes.
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Q2. Then was given to Design a chat application basically a High Level. Interviewer was friendly and prompt listener.
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Q1. Very Detailed Project Discussion and Scenario based Questions basically your achievements in detail.
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Q2. Then some Implementation questions related to designing and Java based and Kafka based.
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Q1. CTC Discussion and Expectations plus Notice period and other documents.
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