10+ Associate Professional Interview Questions and Answers for Freshers

Reverse a given string containing alphabets, numbers, and special characters.

• Iterate through the string from the end to the beginning and append each character to a new string.

• Use built-in functions like reverse() or slicing to reverse the string.

• Handle special characters and numbers while reversing the string.

• Ensure to consider the constraints on the length of the string and the number of test cases.

Given an array of digits, swap two elements to get the maximum number possible.

• Iterate through the array to find the maximum digit.

• Swap the maximum digit with the leftmost occurrence of that digit.

• If the maximum digit is already at the leftmost position, swap it with the second largest digit.

An inner join combines rows from two tables based on a related column between them.

• An inner join returns rows when there is at least one match in both tables based on the join condition.

• It is commonly used to retrieve data from multiple tables that have a relationship.

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

Abstraction is hiding implementation details while Interface is a contract for implementing classes.

• Abstraction is achieved through abstract classes and methods.

• Interface defines a set of methods that a class must implement.

• Abstraction focuses on hiding complexity and providing a simpler interface.

• Interface focuses on defining a standard for communication between classes.

• Abstraction is a way to achieve modularity and maintainability.

• Interface is a way to achieve polymorphism ...read more

A table is a physical storage structure while a view is a virtual table created from a query.

• A table stores data in a structured manner while a view is a virtual table created from a query.

• A table can have indexes and constraints while a view cannot.

• A table can be updated, inserted or deleted while a view cannot be directly modified.

• A view can be used to simplify complex queries or restrict access to certain columns of a table.

• Example: A table named 'employees' can have a vie...read more

Python is likely to be more powerful in the future due to its simplicity, versatility, and popularity.

• Python is known for its simplicity and readability, making it easier for beginners to learn and use.

• Python has a wide range of applications, from web development to data analysis and machine learning.

• Python's popularity is continuously growing, with a large community of developers contributing to its libraries and frameworks.

• Java, on the other hand, is more verbose and comple...read more

The OSI model has 7 layers that define how data is transmitted over a network.

• The layers are: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

• Each layer has a specific function and communicates with the layers above and below it.

• For example, the Physical layer deals with the physical transmission of data, while the Application layer deals with user interfaces and applications.

• The OSI model is a conceptual model and is used to help understand ho...read more

Polymorphism is the ability of an object to take on many forms.

• It allows objects of different classes to be treated as if they were objects of the same class.

• It is achieved through method overriding and method overloading.

• Example: A shape class can have different subclasses like circle, square, and triangle, each with their own implementation of the draw method.

• Example: A method can take in different types of objects as parameters, and the appropriate method will be called ba...read more

Python is not fully object-oriented due to its support for procedural programming and lack of strict encapsulation.

• Python supports multiple programming paradigms, including procedural and functional programming, not just OOP.

• Primitive data types like integers and strings are not objects in the same way as user-defined classes.

• Python allows for procedural code, which can exist outside of classes, making it less strictly OOP.

• Encapsulation is not enforced; attributes can be acce...read more

SQL Error 911 is a database connection error that occurs when the maximum number of concurrent connections has been reached.

• Occurs when the maximum number of concurrent connections has been reached

• Can be resolved by increasing the maximum number of connections allowed

• May also be caused by insufficient memory or disk space

• Commonly seen in IBM DB2 databases

Data encapsulation is the process of hiding implementation details and exposing only necessary information.

• It is a fundamental concept in object-oriented programming.

• It helps in achieving data abstraction and information hiding.

• It allows for better control over data and prevents unauthorized access.

• Example: A class in Java that has private variables and public methods to access them.

• Example: A capsule that contains medicine and only allows access through a small opening.

Hadoop is an open-source framework for distributed storage and processing of large data sets using clusters of computers.

• Hadoop consists of two main components: Hadoop Distributed File System (HDFS) for storage and MapReduce for processing.

• HDFS allows data to be stored across multiple machines, providing high availability and fault tolerance.

• MapReduce is a programming model that processes large data sets in parallel across a Hadoop cluster.

• Hadoop can handle various data types...read more