Brane Enterprises Data Engineer Interview Questions and Answers

Q1. Explain the project you are working on.
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Q2. A code on python, strings.
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Q3. Two tables given and asked how many outputs will you get if you apply inner joim
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Q4. Versioning in aws
Ans. 
Versioning in AWS allows you to manage different versions of your resources.
• AWS S3 supports object versioning to keep multiple versions of an object in the same bucket.

• AWS Lambda supports versioning to manage different versions of your functions.

• AWS API Gateway supports versioning to manage different versions of your APIs.
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Q5. Redshift related questions
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Hackerearth problem on reversing the string & one more array question

Q1. Reverse the string
Ans. 
Reverse a given string
• Use built-in functions like reverse() in Python

• Iterate through the string in reverse order and append characters to a new string

• Use stack data structure to reverse the string
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Q2. SQL based windowing function
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Q1. About project what are optimization you have done
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Q1. What is indexing in SQL?
Ans. 
Indexing in SQL is a technique used to improve the performance of queries by creating a data structure that allows for faster retrieval of data.
• Indexes are created on columns in a database table to speed up the retrieval of data.

• They work similar to the index in a book, allowing the database to quickly find the rows that match a certain condition.

• Indexes can be created using a single column or a combination of columns.

• ...read more
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Q2. Lift capacity and passenger sql query
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Q3. What is your experience in Pyspark , python
Ans. 
I have extensive experience in using Pyspark and Python for data engineering tasks.
• I have worked on various projects involving data processing, transformation, and analysis using Pyspark and Python.

• I am proficient in writing efficient and optimized code in Pyspark for big data processing.

• I have experience in handling large datasets and implementing complex data pipelines using Pyspark and Python.
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Q4. Tell me about architecture of the project that you are working on
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Q1. Sql queries, python program and my clg background
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Q2. Star pattern, codding and sql question oral
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Q1. Joins , sub queries
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Q2. Trigger, group by
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Programing questiion star pattern

Q1. Explain Differnece between ETL AND ELT?
Ans. 
ETL is Extract, Transform, Load where data is extracted, transformed, and loaded in that order. ELT is Extract, Load, Transform where data is extracted, loaded, and then transformed.
• ETL: Data is extracted from the source, transformed in a separate system, and then loaded into the target system.

• ELT: Data is extracted from the source, loaded into the target system, and then transformed within the target system.

• ETL is sui...read more
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Q2. Explain the differnece between the difference?
Ans. 
The difference between the difference is the result of subtracting one value from another.
• Difference is the result of subtracting two values.

• The difference between two values can be positive, negative, or zero.

• For example, the difference between 10 and 5 is 5.
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Q1. Calculate repeating element in list
Ans. 
Find the repeating element in a list
• Iterate through the list and keep track of elements seen so far

• Use a hash set to efficiently check for duplicates

• Return the first element that is already in the set
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Q2. Calculate maximum salary in SQL
Ans. 
Use the MAX() function in SQL to calculate the maximum salary.
• Use the MAX() function along with the column name of the salary field.

• Example: SELECT MAX(salary) FROM employees;

• Ensure the correct table and column names are used in the query.
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