Data Economy Data Engineer Interview Questions and Answers

One python coding question and one sql coding questions and MCQ questions

Q1. --difference between rdd, dataframe and dataset.
Ans. 
RDD is a distributed collection of objects, DataFrame is a distributed collection of rows with schema, and Dataset is a distributed collection of objects with schema.
• RDD is a low-level abstraction in Spark that represents an immutable distributed collection of objects. It lacks the optimization that DataFrames and Datasets provide.

• DataFrame is a distributed collection of data organized into named columns. It provides a...read more
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Hacker Rank Test that was not much hard

Q1. Basics of python, SQL and pyspark
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Q2. Projects written in the resume
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Q1. On databricks architecture
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Q2. Previous project experience
Ans. 
I worked on a data pipeline project that optimized data processing for a retail analytics platform.
• Designed and implemented ETL processes using Apache Airflow to automate data workflows.

• Utilized AWS services like S3 for data storage and Redshift for data warehousing.

• Collaborated with data scientists to ensure data quality and integrity for machine learning models.

• Developed real-time data streaming solutions using Apach...read more
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Q1. Spark based questions and coding questions
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It was a coding round with sql ,python questions , few aptitude questions

Q1. They asked few questions sql and python and few questions - depending on the role
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Q2. BASIC SQL WHAT YOU HAD WRITTEN IN THE CODE
Ans. 
Basic SQL involves writing queries to manage and manipulate relational databases effectively.
• SELECT statement: Used to retrieve data from a database. Example: SELECT * FROM employees;

• WHERE clause: Filters records based on specified conditions. Example: SELECT * FROM employees WHERE age > 30;

• JOIN operations: Combines rows from two or more tables based on a related column. Example: SELECT * FROM orders JOIN customers ...read more
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Q1. They asked me few questions related to sql
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Q2. BASIC PYTHON QUESTIONS LIKE WHAT YOU HAVE WRITTEN IN THE CODE
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Q1. About yourself , your hobby etc
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Python and SQL questions were asked

Q1. I was asked about the project
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Q1. ACID properties of DBMS
Ans. 
ACID properties ensure data integrity in DBMS: Atomicity, Consistency, Isolation, Durability.
• Atomicity ensures that all operations in a transaction are completed successfully or none at all.

• Consistency ensures that the database remains in a consistent state before and after the transaction.

• Isolation ensures that multiple transactions can be executed concurrently without affecting each other.

• Durability ensures that once...read more
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Q1. HR question and family background
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Reasoning and aptitude questions were asked

Q1. Interview was around python programming and team fitment
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First round was a coding test online with screen monitoring

Q1. Hacker rank code for no reason for de
Ans. 
The question is unclear and requires further clarification.
• Request for more information on the specific requirements of the code.

• Ask for clarification on the purpose of the code.

• Determine the programming language to be used.
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Q2. Python sort element of string array by alphabet weightage and resolve all 23 test cases that nobody can
Ans. 
Sort string array elements by alphabet weightage in Python and pass 23 test cases.
• Use the sorted() function with key parameter to sort elements by weightage

• Define a function to calculate weightage of each character

• Test the function with various test cases to ensure accuracy
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