20+ Numantra Technologies Interview Questions and Answers

If connection drops during insertion of 80k records into DB, the insertion process will be interrupted.

• The insertion process will be interrupted and will need to be restarted once the connection is re-established.

• The partially inserted records may need to be cleaned up before restarting the insertion process.

• It is important to have a backup plan in case of such interruptions, such as implementing a retry mechanism or using a transactional approach.

To find the second highest salary using SQL.

• Use the SELECT statement to retrieve the salaries from the table.

• Use the ORDER BY clause to sort the salaries in descending order.

• Use the LIMIT clause to limit the result set to the second row.

• Use the OFFSET clause to skip the first row.

• Combine the above clauses to get the second highest salary.

A trigger is a special type of stored procedure that automatically executes in response to certain events.

• Triggers are used to enforce business rules or data integrity.

• They can be used to audit changes to data.

• Triggers can also be used to replicate data across multiple tables or databases.

• Examples of trigger events include INSERT, UPDATE, and DELETE operations on a table.

Optimizing SQL code involves identifying and removing bottlenecks to improve performance.

• Identify slow queries and optimize them using indexes or rewriting the query

• Reduce the amount of data being queried by using filters or limiting results

• Avoid using subqueries or joins when possible

• Use stored procedures or views to simplify complex queries

• Regularly analyze and optimize the database schema

JMS stands for Java Message Service. Queues are point-to-point messaging while topics are publish-subscribe messaging.

• JMS is a messaging standard for Java applications

• Queues are used for point-to-point messaging where a single message is delivered to a single consumer

• Topics are used for publish-subscribe messaging where a single message is delivered to multiple subscribers

• Queues guarantee message delivery while topics do not

• Example: A queue can be used for sending order confi...read more

Join is a SQL operation that combines rows from two or more tables based on a related column between them.

• Join is used to retrieve data from multiple tables in a single query.

• There are four types of joins: inner join, left join, right join, and full outer join.

• Inner join returns only the matching rows from both tables.

• Left join returns all the rows from the left table and matching rows from the right table.

• Right join returns all the rows from the right table and matching rows...read more

jcd is not a commonly used term. Business logic is written using programming languages and frameworks.

• jcd is not a widely known term in the software development industry

• Business logic is the programming code that defines the rules and processes of a software application

• It is typically written using programming languages such as Java, Python, or C#

• Frameworks such as Spring or Django can also be used to write business logic

• Business logic is responsible for processing data and m...read more

A sealed class is a class that cannot be inherited and an extension method is a method that allows adding new methods to existing types without modifying the original type.

• Sealed class restricts inheritance, preventing other classes from deriving from it.

• Extension methods allow adding new methods to existing types without modifying the original type.

• Example of sealed class: 'sealed class MyClass { }'

• Example of extension method: 'public static class StringExtensions { public s...read more

Data fetch in grid and perform CRUD operations through it involves retrieving data from a grid and manipulating it using create, read, update, and delete operations.

• Use a data source to populate the grid with information

• Implement functions to handle create, read, update, and delete operations on the grid data

• Utilize grid events to trigger CRUD operations

• Ensure proper validation and error handling for data operations

I have experience in performing various types of testing such as functional, regression, integration, performance, and security testing.

• Performed functional testing to ensure that the software meets the specified requirements

• Conducted regression testing to ensure that the changes made to the software did not affect the existing functionality

• Performed integration testing to ensure that the different modules of the software work together seamlessly

• Conducted performance testing ...read more

To create an interface, you need to design the layout, choose the appropriate controls, and write the code to connect them.

• Determine the purpose and functionality of the interface

• Choose the appropriate layout and design elements

• Select the appropriate controls and widgets

• Write the code to connect the controls to the underlying data or functionality

• Test and refine the interface based on user feedback

Test cases format can be designed using various techniques.

• Test cases can be designed using boundary value analysis.

• Equivalence partitioning can also be used to design test cases.

• Decision table testing is another technique for designing test cases.

• State transition testing can be used for testing systems with different states.

• Use case testing can be used to test the system's functionality from the user's perspective.

Abstract class can have both abstract and non-abstract methods, while interface can only have abstract methods.

• Abstract class can have constructors, fields, and methods, while interface cannot have any implementation.

• A class can only extend one abstract class, but can implement multiple interfaces.

• Abstract classes are used to define common characteristics among subclasses, while interfaces are used to define a contract for classes to implement.

• Example: Abstract class - Animal...read more

Session is specific to a user's interaction with a website, while application is global to all users.

• Session stores user-specific data, while application stores data accessible to all users.

• Session is temporary and expires after a period of inactivity, while application data persists.

• Session is used for user authentication and personalization, while application data is used for global settings and configurations.

A delegate is a type that represents references to methods with a specific parameter list and return type.

• Delegates are similar to function pointers in C++ or pointers to member functions in C++/CLI.

• Delegates allow methods to be passed as parameters.

• Delegates can be used to define callback methods.

• Delegates can invoke the methods they reference.

• Delegates are type-safe and secure.

There are four types of SQL joins: 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 the right table.

• RIGHT JOIN: Returns all rows from the right table and the matched rows from the left table.

• FULL JOIN: Returns rows when there is a match in one of the tables.

Redux is required in a React application to manage the application state in a predictable way.

• Helps in managing the state of the application in a centralized store

• Enables easier debugging and tracking of state changes

• Facilitates state management in complex applications with multiple components

• Allows for time-travel debugging by maintaining a history of state changes

• Helps in maintaining a single source of truth for the application state

Middleware is software that acts as a bridge between different applications or components, allowing them to communicate and share data.

• Middleware helps in managing communication between different systems or components.

• It can provide services such as authentication, logging, and caching.

• Examples of middleware include web servers like Apache or Nginx, and frameworks like Express.js in Node.js.

Code a C program for a pattern using an array of strings.

• Use nested loops to iterate through rows and columns

• Use conditional statements to determine when to print a character or a space

• Use an array of strings to store the pattern

OOPs concepts in Java are the fundamental principles of object-oriented programming, 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 implementation details and showing only the necessary featu...read more

HashMap is a data structure that stores key-value pairs and uses hashing to quickly retrieve values based on keys.

• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine the index in the array where the pair will be stored.

• If multiple keys hash to the same index, a linked list is used to handle collisions.

• To retrieve a value, the key is hashed again to find the index and then the linked list is s...read more

I have 5 years of experience working with plastics in various industries.

• Experience in injection molding, extrusion, and thermoforming

• Familiarity with different types of plastics and their properties

• Knowledge of design for manufacturability and tooling

• Worked on projects involving plastic parts for automotive and consumer electronics industries

My current CTC is $100,000 per year.

• Current CTC is $100,000 per year

• CTC includes salary, bonuses, and other benefits

• CTC may vary based on experience and negotiation skills

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

• Example: SELECT * FROM table1 INNER JOIN table2 ON table1.column = table2.column

Closures are functions that have access to variables from their containing scope even after the scope has closed.

• Closures allow functions to 'remember' the environment in which they were created.

• They can access variables from their outer function even after the outer function has finished executing.

• Closures are commonly used in event handlers, callbacks, and asynchronous programming.

OOPS concepts refer to Object-Oriented Programming concepts which include 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 details and showing only the necessary features.