Tata Digital Data Scientist Interview Questions and Answers

Reverse a string in a list of strings

• Iterate through each string in the list

• Use the built-in function to reverse each string

• Store the reversed strings in a new list

Joins in SQL are used to combine rows from two or more tables based on a related column between them.

• Joins are used to retrieve data from multiple tables based on a related column

• Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

• Example: SELECT * FROM table1 INNER JOIN table2 ON table1.column = table2.column

Proficiency in cloud technology is essential for data scientists to efficiently store, manage, and analyze large datasets.

• Experience with cloud platforms like AWS, Azure, or Google Cloud

• Knowledge of cloud storage solutions like S3, Blob Storage, or Cloud Storage

• Understanding of cloud computing concepts like virtual machines, containers, and serverless computing

• Ability to work with big data technologies like Hadoop, Spa

Bigquery architecture is a distributed, serverless, highly scalable, and cost-effective data warehouse designed for large-scale data analytics.

• Bigquery uses a distributed architecture to store and query data across multiple servers for high performance.

• It is serverless, meaning users do not need to manage any infrastructure and can focus on analyzing data.

• Bigquery is highly scalable, allowing users to easily scale up o...read more

Data ingestion is the process of collecting, importing, and processing data from various sources into a storage system.

• Data ingestion involves extracting data from different sources such as databases, APIs, files, and streaming platforms.

• The extracted data is then transformed and loaded into a data warehouse, data lake, or other storage systems for analysis.

• Common tools used for data ingestion include Apache Kafka, Apa...read more

Informatica is a data integration tool used for ETL (Extract, Transform, Load) processes in data engineering.

• Informatica is used for extracting data from various sources like databases, flat files, etc.

• It can transform the data according to business rules and load it into a target data warehouse or database.

• Informatica provides a visual interface for designing ETL workflows and monitoring data integration processes.

• It ...read more

Datastage is an ETL tool used for extracting, transforming, and loading data from various sources to a target destination.

• Datastage is part of the IBM Information Server suite.

• It provides a graphical interface to design and run data integration jobs.

• Datastage supports parallel processing for high performance.

• It can connect to a variety of data sources such as databases, flat files, and web services.

• Datastage jobs can b...read more