Nexii IT Labs Interview Questions and Answers

Q1. Regrading Self join query
Ans. 
A self join query is used to join a table to itself in a SQL query.
• Self join is used when a table needs to be joined with itself to compare rows within the same table.

• It requires aliasing the table with different names to distinguish between the two instances of the same table.

• Commonly used in hierarchical data structures or when comparing related rows in a table.
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Q2. Group by query per catagory
Ans. 
Group by query is used to group data based on a specific category.
• Use the GROUP BY clause in SQL to group data based on a specific column

• Aggregate functions like COUNT, SUM, AVG can be used with GROUP BY to perform calculations on grouped data

• Example: SELECT category, COUNT(*) FROM products GROUP BY category
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Q1. Explain recent project
Ans. 
Developed a predictive model for customer churn in a telecom company
• Collected and cleaned customer data from various sources

• Performed exploratory data analysis to identify patterns and trends

• Built a machine learning model using logistic regression to predict customer churn

• Evaluated the model's performance using metrics such as accuracy, precision, and recall
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Q2. Cloud technologies used
Ans. 
Various cloud technologies like AWS, Azure, and Google Cloud are commonly used for data analysis.
• AWS (Amazon Web Services)

• Azure (Microsoft Azure)

• Google Cloud Platform
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Performance based questions

Good and easy most of the question are reapeted

Arrays, string, constructors in basic to medium level

Q1. Questions based on the resume in technical way
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Q2. Oops concept dbms string data structures
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Q1. General HR questions in easy level
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Some basic question of programming

Q1. Takes 40 to 50 minutes
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Q2. Basic algo and html tag OOPs
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8 sections
English speaking and writing
Numerical ability
Comprehensive writing
Easy

Q1. Basic education Why this company Y not a it company
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Q1. Python pytest concepts Shell commands
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Q1. Coding Python basics Api automation questions
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Q1. What is oops concepts and explain each one of theme
Ans. 
Object-oriented programming concepts focus on data and methods, including inheritance, encapsulation, polymorphism, and abstraction.
• Inheritance: Allows a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the complex implementation...read more
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Print 1 to 100 with out using loops