Flashcards

Data Engineering

Building and managing big data infrastructure

5 minutes 5 Questions

Data Engineering forms a critical foundation in the realm of Big Data Science. It encompasses the development, construction, and maintenance of architectures, systems, and infrastructure required to transform raw data into formats accessible for analysis. Data Engineers design robust pipelines tha…

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Big Data Scientist - Data Engineering Example Questions

Test your knowledge of Data Engineering

Question 1

What is the primary purpose of data engineering?

To design, build and maintain the infrastructure needed for data you are working with To design UI for the data To create dashboards for the data To analyze the data To visualize the data To train machine learning models

Correct Answer: To design, build and maintain the infrastructure needed for data you are working with

Data engineering is focused on designing, building, and maintaining the infrastructure, tools, and frameworks needed to store and process data at scale. The purpose is to provide clean, reliable data that can be used to drive business insights and inform decision-making.

Question 2

What is the purpose of data deduplication?

To make data more complex and difficult to work with To create duplicate copies of data and increase storage costs To eliminate duplicate copies of data and reduce storage costs To increase the size of the data set To reduce the accuracy of the data To make the data more difficult to query

Correct Answer: To eliminate duplicate copies of data and reduce storage costs

Data deduplication is used to eliminate duplicate copies of data, reducing storage costs and increasing the efficiency of data processing. This is done by identifying and removing identical copies of data, while still maintaining access to the data when needed.

Question 3

What is a Join in SQL?

A mathematical operation that subtracts the values in one column from another column in the same table. A data transformation operation that splits a single column into multiple columns based on a delimiter. A combine operation that merges rows from two or more tables into a single result set based on a related column between them. An aggregation operation that groups rows by a specific column and returns the count of each group. A function that concatenates two string columns into a new column A query that selects all unique values in a column.

Correct Answer: A combine operation that merges rows from two or more tables into a single result set based on a related column between them.

Joins allow data from different tables to be combined into a single result set based on a related column between them. By combining data in this manner, queries can access data from multiple tables at once and provide more complete answers to questions than would be possible from any single table.

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