Tredence Data Engineer Interview Questions and Answers

To execute a second notebook from the first notebook, you can use the %run magic command in Jupyter Notebook.

• Use the %run magic command followed by the path to the second notebook in the first notebook.

• Ensure that the second notebook is in the same directory or provide the full path to the notebook.

• Make sure to save any changes in the second notebook before executing it from the first notebook.

I have used activities such as Copy Data, Execute Pipeline, Lookup, and Data Flow in Data Factory.

• Copy Data activity is used to copy data from a source to a destination.

• Execute Pipeline activity is used to trigger another pipeline within the same or different Data Factory.

• Lookup activity is used to retrieve data from a specified dataset or table.

• Data Flow activity is used for data transformation and processing.

Create a database to store information about colleges, students, and professors.

• Create tables for colleges, students, and professors

• Include columns for relevant information such as name, ID, courses, etc.

• Establish relationships between the tables using foreign keys

• Use SQL queries to insert, update, and retrieve data

• Consider normalization to avoid data redundancy

Data lake storage is optimized for big data analytics and can store structured, semi-structured, and unstructured data. Blob storage is for unstructured data only.

• Data lake storage is designed for big data analytics and can handle structured, semi-structured, and unstructured data

• Blob storage is optimized for storing unstructured data like images, videos, documents, etc.

• Data lake storage allows for complex queries and analytics on diverse data types

• Blob storage is more cost-e...read more

Optimizing code involves identifying bottlenecks, improving algorithms, using efficient data structures, and minimizing resource usage.

• Identify and eliminate bottlenecks in the code by profiling and analyzing performance.

• Improve algorithms by using more efficient techniques and data structures.

• Use appropriate data structures like hash maps, sets, and arrays to optimize memory usage and access times.

• Minimize resource usage by reducing unnecessary computations and memory alloca...read more

SQL window function is used to perform calculations across a set of table rows related to the current row.

• Window functions operate on a set of rows related to the current row

• They can be used to calculate running totals, moving averages, rank, etc.

• Examples include ROW_NUMBER(), RANK(), SUM() OVER(), etc.