10+ Interview Questions and Answers

Rank and Dense Rank are transformations in PySpark used to assign ranks to rows based on a specific column.

• Rank assigns unique ranks to each row based on the order of values in a specific column.

• Dense Rank assigns ranks to each row based on the order of values in a specific column, but with no gaps between ranks.

• Both transformations can be used with the 'over' function to specify the column to order by.

• Example: df.select('name', 'score', rank().over(Window.orderBy('score')).a...read more

Cloud is a network of remote servers hosted on the internet to store, manage, and process data.

• Cloud computing allows users to access data and applications from any device with an internet connection.

• It provides scalability, flexibility, and cost-effectiveness for businesses.

• Examples of cloud services include Amazon Web Services (AWS), Microsoft Azure, and Google Cloud Platform.

BigQuery is a fully managed, serverless data warehouse by Google Cloud for analyzing large datasets using SQL queries.

• BigQuery is a cloud-based data warehouse that allows for fast SQL queries on large datasets.

• It is fully managed and serverless, meaning users do not have to worry about infrastructure management.

• BigQuery can handle petabytes of data and allows for real-time analytics with its streaming capabilities.

• It supports standard SQL queries and integrates with other Goo...read more