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SQL Challenges: a. Given two tables, "Sales" and "Customers," write a SQL query to calculate the total sales amount for each customer in the last quarter of the year, considering only customers who have made at least three purchases during that period. b. Write a SQL query to identify the top 10% of products with the highest sales revenue in the "Products" table, excluding products that have been discontinued. Python Coding Challenge: You have been provided with two CSV files: "employees.csv" and "departments.csv." The "employees.csv" file contains information about employees, including their names, salaries, department IDs, and hire dates. The "departments.csv" file contains department IDs and their respective names. Write a Python script to perform the following tasks: a. Calculate the average salary for each department and store the results in a new CSV file named "average_salary_per_department.csv." b. Identify the department with the highest average salary and print its name along with the value. c. Determine the number of employees hired in each year and output the results in descending order. ETL Workflow Design: Describe the end-to-end workflow you would design for an ETL process that involves extracting data from a real-time streaming source, transforming the data to fit a specific data model, and loading it into a data warehouse. Consider handling late-arriving data, data consistency, and error logging in your design. Data Quality and Validation: Explain how you would ensure data quality during the ETL process. What techniques and checks would you implement to identify and handle anomalies, missing values, and inconsistencies in the data? Performance Optimization: Discuss strategies for optimizing the performance of an ETL pipeline when dealing with large volumes of data. How would you approach parallel processing, partitioning, and indexing to enhance the overall performance?
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ETL Developer

Interviewed at ValueMomentum

3.4★
Jul 21, 2023

SQL Challenges: a. Given two tables, "Sales" and "Customers," write a SQL query to calculate the total sales amount for each customer in the last quarter of the year, considering only customers who have made at least three purchases during that period. b. Write a SQL query to identify the top 10% of products with the highest sales revenue in the "Products" table, excluding products that have been discontinued. Python Coding Challenge: You have been provided with two CSV files: "employees.csv" and "departments.csv." The "employees.csv" file contains information about employees, including their names, salaries, department IDs, and hire dates. The "departments.csv" file contains department IDs and their respective names. Write a Python script to perform the following tasks: a. Calculate the average salary for each department and store the results in a new CSV file named "average_salary_per_department.csv." b. Identify the department with the highest average salary and print its name along with the value. c. Determine the number of employees hired in each year and output the results in descending order. ETL Workflow Design: Describe the end-to-end workflow you would design for an ETL process that involves extracting data from a real-time streaming source, transforming the data to fit a specific data model, and loading it into a data warehouse. Consider handling late-arriving data, data consistency, and error logging in your design. Data Quality and Validation: Explain how you would ensure data quality during the ETL process. What techniques and checks would you implement to identify and handle anomalies, missing values, and inconsistencies in the data? Performance Optimization: Discuss strategies for optimizing the performance of an ETL pipeline when dealing with large volumes of data. How would you approach parallel processing, partitioning, and indexing to enhance the overall performance?

Question were mainly related to previous projects done earlier company. Mostly on what was the complexity and how it was handled. There will be lot cross question on what you explain. Other then this they asked few technical questions on ETL tool.
avatar

ETL Developer

Interviewed at Bitwise

3.6★
Apr 1, 2015

Question were mainly related to previous projects done earlier company. Mostly on what was the complexity and how it was handled. There will be lot cross question on what you explain. Other then this they asked few technical questions on ETL tool.

I spoke to a Woman who was the BI Manager She asked me what was my current project? How did I use HANA as a use case? What are my Universe development skills? Have I worked in agile methodology? Where do you see yourself in the next 5 years? She told me a bunch of roles in her team and asked where would I fit in? Which was your best role? What are your salary requirements and do you need any relocation assistance?
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ETL/HANA Engineer

Interviewed at WillScot

2.8★
Aug 11, 2018

I spoke to a Woman who was the BI Manager She asked me what was my current project? How did I use HANA as a use case? What are my Universe development skills? Have I worked in agile methodology? Where do you see yourself in the next 5 years? She told me a bunch of roles in her team and asked where would I fit in? Which was your best role? What are your salary requirements and do you need any relocation assistance?

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