Dell Senior Data Engineer Interview Questions and Answers

Tell about AC industry

Q1. Move zeros to end?
Ans. 
Move all zeros in an array of strings to the end while maintaining the order of non-zero elements.
• Iterate through the array and move all zeros to the end while keeping the order of non-zero elements.

• Use two pointers approach to swap elements in-place.

• Example: Input: ['a', 'b', 'c', '0', 'd', '0'], Output: ['a', 'b', 'c', 'd', '0', '0']
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Q2. WHat are AWS services?
Ans. 
AWS services are cloud computing services provided by Amazon Web Services.
• Compute services (e.g. EC2, Lambda)

• Storage services (e.g. S3, EBS)

• Database services (e.g. RDS, DynamoDB)

• Networking services (e.g. VPC, Route 53)

• Machine learning services (e.g. SageMaker)

• Analytics services (e.g. Redshift, Athena)
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Q3. What is dynamodb?
Ans. 
DynamoDB is a fully managed NoSQL database service provided by AWS.
• Fully managed NoSQL database service

• Scalable and high-performance

• Supports key-value and document data models

• Automatically replicates data across multiple Availability Zones for high availability
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Q1. How good are you at stress handling situations?
Ans. 
I am very good at handling stress situations, remaining calm and focused under pressure.
• I have experience working on high-pressure projects with tight deadlines.

• I am able to prioritize tasks effectively and stay organized during stressful situations.

• I have developed strong problem-solving skills that help me navigate stressful scenarios.

• I am able to communicate effectively with team members and stakeholders to manage s...read more
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Q2. Why daikin eloaborate this?
Ans. 
Daikin may elaborate on a topic to provide more detailed information or explanation.
• To provide a better understanding of a complex concept or product

• To address potential questions or concerns from customers

• To showcase the company's expertise and knowledge in the industry
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Q1. What is join in sql
Ans. 
Join in SQL is used to combine rows from two or more tables based on a related column between them.
• Join is used to retrieve data from multiple tables based on a related column

• Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

• Example: SELECT * FROM table1 INNER JOIN table2 ON table1.column = table2.column
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Q2. What is primary key
Ans. 
Primary key is a unique identifier for each record in a database table.
• Primary key ensures each record in a table is uniquely identified

• It must contain unique values and cannot have NULL values

• Primary key can be a single column or a combination of columns

• Example: 'ID' column in a 'Users' table can be a primary key
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Q1. Asked to create a power bi dashboard
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Q1. Had coding test on SQL and Python
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Java 8, DSA, algorithms

1.5 hrs duration of interview

Technology trends- various trending software engineering practices

Q1. Java 8 full stack interview
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Q2. Backend development
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Easy to attempt and creak the test

Q1. About yourself, c basic questions, about your project
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Q1. About yourself, about company, about location
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2 ad-hoc coding questions :

1st was related to the incremental sorting of an array.
2nd was related to adding logic to a function snippet.

Q1. Personals and educational background
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Q2. Logic of binary tree, heap, doubly link list
Ans. 
Binary tree is a tree data structure where each node has at most two children, heap is a specialized tree-based data structure, doubly linked list is a linked list where each node points to both the next and previous nodes.
• Binary tree: each node has at most two children, left child and right child. Example: binary search tree.

• Heap: a complete binary tree where the value of each node is greater than or equal to the valu...read more
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Q3. Questions around final year project
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Q1. Personals and cultural fit round
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Q1. Background History
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Q2. Talk about your side projects and github repo
Ans. 
I have worked on various side projects including a personal website and a mobile app for tracking fitness goals.
• Developed a personal website using HTML, CSS, and JavaScript to showcase my projects and skills.

• Created a mobile app using React Native to track fitness goals and provide workout routines.

• Contributed to open-source projects on GitHub to improve my coding skills and collaborate with other developers.
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Basic QR Questions that includes logics, and puzzles

Hackerrank questions, 2 easy , 2 medium

Apritude was quite moderate. Box test

Q1. 1.Explains oops
Ans. 
Object-oriented programming paradigm that focuses on objects and classes for code organization and reusability.
• Encapsulation: Bundling data and methods that operate on the data into a single unit (object)

• Inheritance: Ability of a class to inherit properties and behavior from another class

• Polymorphism: Ability to present the same interface for different data types

• Abstraction: Hiding the complex implementation details an
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Q2. Explain normalization
Ans. 
Normalization is the process of organizing data in a database to reduce redundancy and improve data integrity.
• Normalization involves breaking down data into smaller, more manageable parts.

• It helps in reducing data redundancy by storing data in a structured way.

• Normalization ensures data integrity by avoiding anomalies like insertion, update, and deletion anomalies.

• There are different levels of normalization such as 1NF...read more
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