Knowledge Lens Senior Big Data Engineer Interview Questions and Answers

Q1. Bias variance trade off
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Q2. What is AB testing
Ans. 
AB testing is a method used to compare two versions of a webpage or app to determine which one performs better.
• AB testing involves creating two versions (A and B) of a webpage or app with one differing element

• Users are randomly assigned to either version A or B to measure performance metrics

• The version that performs better in terms of the desired outcome is selected for implementation

• Example: Testing two different call...read more
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Q3. Basic traditional ML question about ML metrics, bagging boosting etc.
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It was a classification problem

Q1. Questions about assignment
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Q2. Questions from resume.
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Q3. Questions based on probability, statistics and loss functions
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Sql assessment round

Q1. Python gcp biquery airflow dataflow sql
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Q1. Recent projects experience, bigquery, sql
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Q1. Salary discussion
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Coding round had one SQL and one Python question. And some mcqs around python and math

Q1. It was on store and products querying with SQL
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Q2. Same questions were asked in Python
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Q1. It was a techno-managerial round with some guesstimates and about my recent projects
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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
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Q1. HR question and family background
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It was a written test where theoretical SQL questions were asked like primary key, foreign key, set operators and some queries

Q1. All SQL Concepts like Join, normalization, trigger, stored procedure, keys, drop truncate del difference, where having difference, Aggregate scaler window functions, fetch duplicate records query, acid pro...read more
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Q1. Ques -> Can you define difference b/w Azure data lake and Delta lake.
Ans. 
Azure Data Lake is a cloud-based storage and analytics service, while Delta Lake is an open-source storage layer that adds reliability to data lakes.
• Azure Data Lake is a service provided by Microsoft Azure for storing and analyzing large amounts of data.

• Delta Lake is an open-source storage layer that adds ACID transactions and schema enforcement to data lakes.

• Azure Data Lake is a cloud-based solution, while Delta Lake ...read more
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Q2. How to implemented Primary key and foreign key in delta tables.
Ans. 
Primary keys and foreign keys can be implemented in delta tables using constraints and references.
• Primary keys can be implemented using the PRIMARY KEY constraint, which ensures that each record in the table has a unique identifier.

• Foreign keys can be implemented using the FOREIGN KEY constraint, which establishes a link between two tables based on a common column.

• The referenced table must have a primary key defined, a...read more
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Q3. How to handle exception in python?
Ans. 
Exception handling in Python allows for the graceful handling of errors and prevents program crashes.
• Use try-except blocks to catch and handle exceptions.

• Multiple except blocks can be used to handle different types of exceptions.

• The finally block is executed regardless of whether an exception occurred or not.

• Exceptions can be raised using the 'raise' keyword.

• Custom exceptions can be defined by creating a new class that
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Q4. What is star schema and snowflake schema
Ans. 
Star schema is a data modeling technique where a central fact table is connected to multiple dimension tables. Snowflake schema is an extension of star schema with normalized dimension tables.
• Star schema is a simple and denormalized structure

• It consists of a central fact table connected to multiple dimension tables

• Dimension tables contain descriptive attributes

• Star schema is easy to understand and query, but can lead t...read more
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Q5. Which are the most frequently change
Ans. 
The most frequently changing data
• Customer preferences

• Market trends

• Weather data

• Stock prices

• Social media trends
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Well designed to test the aptitude competence of the candidate.

Q1. Explanations for the answers given to the aptitude questions.
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Q2. Questions from python.
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