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Walmart Labs Data Engineer 3 Interview Questions and Answers
Walmart Labs Data Engineer 3 Interview Experiences
1 interview found
Anonymous
Selected
I applied via Referral and was interviewed before Apr 2023. There were 3 interview rounds.
(2 Questions)
- Q1. Recursive CTE related SQL
- Q2. Python program to parse JSON
- Ans.
Python program to parse JSON
Use the json module in Python to parse JSON data
Use the loads() method to load JSON data into a Python dictionary
Access the data in the dictionary using keys
(2 Questions)
- Q1. Advanced SQL on JOINs and Windowing
- Q2. Spark Optimization on JOIN queries
- Ans.
Optimizing JOIN queries in Spark involves partitioning data, using broadcast joins, and optimizing shuffle operations.
Partition data to avoid shuffling unnecessary data across the network
Use broadcast joins for small tables that can fit in memory of each executor
Optimize shuffle operations by tuning shuffle partitions and memory settings
No case study was asked. HM asked about my experience and project details.
Interview Preparation Tips
Skills evaluated in this interview
Interview questions from similar companies
I applied via Campus Placement and was interviewed before Feb 2020. There were 4 interview rounds.
Interview Questionnaire
1 Question
- Q1. Hr
Interview Preparation Tips
I applied via Campus Placement and was interviewed in Mar 2020. There was 1 interview round.
Interview Questionnaire
1 Question
- Q1. How do you get the second to last element from a SQL table?
- Ans.
To get the second to last element from a SQL table, use the OFFSET-FETCH clause.
Use the ORDER BY clause to sort the table in descending order.
Use the OFFSET-FETCH clause to skip the last row and fetch the second to last row.
Example: SELECT column_name FROM table_name ORDER BY column_name DESC OFFSET 1 ROWS FETCH NEXT 1 ROWS ONLY;
Interview Preparation Tips
Skills evaluated in this interview
I applied via Campus Placement and was interviewed before May 2020. There were 3 interview rounds.
Interview Questionnaire
1 Question
- Q1. Basic coding questions
Interview Preparation Tips
Interview Questionnaire
1 Question
- Q1. Mostly related to the technology I applied for. Some coding related questions. Questions related to our expertise to test us.
I applied via Campus Placement and was interviewed before Mar 2020. There were 3 interview rounds.
Interview Questionnaire
1 Question
- Q1. Tell me something about yourself
Interview Preparation Tips
I applied via Campus Placement and was interviewed before Mar 2020. There was 1 interview round.
Interview Questionnaire
2 Questions
- Q1. Basics about .Net and SQl server
- Q2. What are triggers
- Ans.
Triggers are database objects that automatically execute in response to certain events or changes in data.
Triggers are used to enforce business rules or data integrity.
They can be used to audit changes to data.
Triggers can be set to execute before or after an event, such as an insert, update, or delete operation.
They can be defined on tables, views, or schemas.
Examples of triggers include sending an email notification ...
Interview Preparation Tips
Skills evaluated in this interview
I applied via Walk-in and was interviewed before May 2021. There were 2 interview rounds.
General Aptitude
(2 Questions)
- Q1. Java related questions
- Q2. Senarios related questions
Interview Preparation Tips
I applied via Campus Placement and was interviewed before Apr 2020. There were 4 interview rounds.
Interview Questionnaire
1 Question
- Q1. Tell me about Yourself?
Interview Preparation Tips
1. Sit in the meditative state for 2-5 mins just before the interview.
2.Think about all the blessings and all that you have and thank for having that.
3. Go with the mind set of being ethical and say to yourself that you are going to crack this interview no matter what (Easy,Medium or difficult)
Thank you
I would be happy if many people can take advantage of these advices.
I applied via Company Website and was interviewed before Jun 2020. There was 1 interview round.
Interview Questionnaire
3 Questions
- Q1. By Rajkumar Bharathi, I stay at Trichy
- Q2. I have completed my B.E from kalasalingam university in 2020, with a score of 6.33
- Q3. I am a fresher need this jobs
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Walmart Labs Data Engineer 3 Interview Process
based on 1 interview
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