NielsenIQ Interview Questions, Process, and Tips

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Q1. Garbage Collection
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Q2. Microservices adv and dis-adv
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Q1. Write MySQL query to find employee with 2nd Highest salary
Ans. 
Use MySQL query with ORDER BY and LIMIT to find employee with 2nd highest salary.
• Use ORDER BY salary DESC to sort salaries in descending order

• Use LIMIT 1,1 to skip the highest salary and get the second highest salary
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Q2. What is branch in git
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A branch in git is a separate line of development that allows you to work on features or fixes without affecting the main codebase.
• Branches allow for parallel development

• They can be created, switched between, merged, and deleted

• Common branches include master, develop, feature branches, and release branches
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Q1. About The Project.
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Q2. Data modelling questions
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Q1. What is filter in power BI ?
Ans. 
Filter in Power BI is used to narrow down the data displayed in visuals based on specific criteria.
• Filters can be applied to individual visuals or to the entire report

• Filters can be based on specific values, ranges, or conditions

• Examples include filtering sales data by region, filtering dates, or filtering by product category
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Q2. What is difference between DAX and filters?
Ans. 
DAX is a formula language used in Power BI and Excel for data analysis, while filters are used to narrow down data based on specific criteria.
• DAX is a formula language used in Power BI and Excel for data analysis

• Filters are used to narrow down data based on specific criteria

• DAX can be used to create calculated columns and measures, while filters can be applied to visuals to show specific data
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Q1. What is stored procdedure?
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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
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Q2. What are the joins
Ans. 
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. What is Stochastic Gradient Descend?
Ans. 
Stochastic Gradient Descent is an optimization algorithm used to minimize the cost function in machine learning by updating parameters iteratively.
• SGD is a variant of Gradient Descent that updates the model's parameters using a single training example at a time.

• It is computationally efficient and is commonly used in large-scale machine learning tasks.

• SGD is suitable for online learning and can handle large datasets eff...read more
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Q2. How to improve SGD?
Ans. 
To improve SGD, consider adjusting learning rate, using momentum, implementing learning rate schedules, and adding regularization techniques.
• Adjust learning rate: Experiment with different learning rates to find the optimal value for faster convergence.

• Use momentum: Incorporate momentum to accelerate SGD in the relevant direction and dampen oscillations.

• Implement learning rate schedules: Decay the learning rate over ti...read more
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Q1. How will you cleanup disk
Ans. 
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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