NielsenIQ Interview Questions, Process, and Tips

Q1. Windows functions in sql
Ans. 
Window functions in SQL are used to perform calculations across a set of table rows related to the current row.
• Window functions are used to calculate values based on a specific subset of rows within a table.

• They allow for ranking, aggregation, and other calculations without grouping the rows.

• Examples of window functions include ROW_NUMBER(), RANK(), and SUM() OVER().
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Q2. Delta lake from Databricks
Ans. 
Delta Lake is an open-source storage layer that brings ACID transactions to Apache Spark and big data workloads.
• Delta Lake is built on top of Apache Spark and provides ACID transactions for big data processing.

• It allows for schema enforcement and evolution, data versioning, and time travel queries.

• Delta Lake is compatible with popular data science and machine learning libraries like TensorFlow and PyTorch.
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Q1. About your experience Questions will be around your skills mentioned in the resume and your previous profile
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Q1. General questions
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Duration of test is 45 Minutes, there is 3 subsection - 1. Cognitive Ability, 2. Logical Reasoning, 3. Basis quant

Time is 15 Minutes, Topic is electronic vehicle vs. fuel vehicle

Q1. Basic question related to your resume. Some logical questions too. and many more scenario based questions
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Q2. Tell me about yourself.
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Q3. Tell me about your work experience.
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Q1. Tell me about your self, why you want to join, what do you know about NIQ,case study on people management
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