NielsenIQ Interview Questions and Answers for Experienced

Q1. What is stored procdedure?
Ans. 
Stored procedure is a precompiled collection of SQL statements that can be executed by calling the procedure name.
• Stored procedures are used to encapsulate and group SQL code for reuse and performance optimization.

• They can accept input parameters and return output parameters.

• Stored procedures can be called from applications or other stored procedures.

• They are stored in the database and can be executed multiple times wi...read more
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Q2. What are the joins
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Joins are used in databases 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 between them

• Common types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

• INNER JOIN returns rows when there is at least one match in both tables

• LEFT JOIN returns all rows from the left table and the matched rows from th...read more
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Q1. How will you cleanup disk
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To cleanup disk, you can use disk cleanup tools, delete unnecessary files, uninstall unused programs, and empty the recycle bin.
• Use disk cleanup tools like Disk Cleanup in Windows or CleanMyMac in macOS to remove temporary files and other unnecessary data

• Delete unnecessary files and folders that are taking up space on the disk

• Uninstall unused programs or applications to free up disk space

• Empty the recycle bin to perman...read more
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Q2. Daily BAU activities
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Q1. Basic java and selenium questions. Oops concept, singleton class, diff b/w interface and abstract Exception, broken links, find element and find elements. Very basic interview questions
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Q2. Basic Api and sql query
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Q1. Agile methodology
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Q1. Work experience and salary
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Online coding test with spring boot rest API and a java problem solving.

Q1. Design a REST API
Ans. 
Design a REST API for a backend Java developer
• Define the resources and endpoints

• Use HTTP methods like GET, POST, PUT, DELETE

• Implement authentication and authorization

• Use JSON for data exchange

• Include error handling and status codes
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Q2. Provided a list of string with names. and the result should be with a map of the name as key and number of vovels as value. Use Java stream API only.
Ans. 
Use Java Stream API to create a map of names and their corresponding vowel counts.
• Use Stream.of() to create a stream from the array of names.

• Map each name to its vowel count using a custom method.

• Collect the results into a Map using Collectors.toMap().

• Example: For names ['Alice', 'Bob'], the output would be {'Alice': 3, 'Bob': 1}.
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Q1. Difference between list and set
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List is an ordered collection of elements with duplicates allowed, while set is an unordered collection of unique elements.
• List maintains the order of elements, while set does not guarantee any specific order.

• List allows duplicate elements, while set does not allow duplicates.

• Example: List - [1, 2, 3, 1], Set - {1, 2, 3}
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Q2. How to optimize pyspark
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Optimizing PySpark involves tuning configurations, using efficient transformations/actions, and leveraging caching.
• Tune PySpark configurations for optimal performance (e.g. adjusting memory settings, parallelism)

• Use efficient transformations/actions to minimize unnecessary data shuffling (e.g. using narrow transformations like map instead of wide transformations like groupByKey)

• Leverage caching to persist intermediate ...read more
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Q3. Explain SOLID principles
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SOLID principles are a set of five design principles in object-oriented programming to make software designs more understandable, flexible, and maintainable.
• S - Single Responsibility Principle: A class should have only one reason to change.

• O - Open/Closed Principle: Software entities should be open for extension but closed for modification.

• L - Liskov Substitution Principle: Objects of a superclass should be replaceable...read more
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Q1. Ticketing system design
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Ticketing system design involves creating a platform for users to submit, track, and resolve issues or requests.
• Design a user-friendly interface for submitting tickets

• Implement a system for assigning tickets to appropriate teams or individuals

• Include features for tracking ticket status and communication with users

• Consider scalability and performance of the system

• Integrate with other tools or systems for seamless workfl...read more
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Q2. Aws ec2 and jenkins
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