20+ System Associate Interview Questions and Answers

A primary key is a unique identifier for a record in a database table.

• It ensures that each record is unique and can be easily accessed.

• It is used to establish relationships between tables.

• It cannot be null or have duplicate values.

• Examples include social security numbers, email addresses, and employee IDs.

Object oriented programming concepts are principles used in programming to organize code and data around objects.

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

• Inheritance: Allowing a new class to inherit properties and methods from an existing class.

• Polymorphism: The ability for objects of different classes to respond to the same message in different ways.

• Abstraction: Hiding complex implementation details and showing only the ne...read more

C is a procedural programming language while C++ is a multi-paradigm programming language with object-oriented features.

• C is a procedural programming language, while C++ supports both procedural and object-oriented programming.

• C does not have classes and objects, while C++ supports classes and objects.

• C does not have features like inheritance and polymorphism, which are supported in C++.

• C is a subset of C++, meaning that C++ includes all of C's features and adds new features ...read more

OOP is a programming paradigm based on objects, encapsulating data and behavior, promoting code reusability and modularity.

• Encapsulation: Bundling data and methods that operate on the data within one unit (e.g., a class).

• Inheritance: Mechanism to create a new class based on an existing class, inheriting its properties (e.g., a 'Dog' class inheriting from an 'Animal' class).

• Polymorphism: Ability to present the same interface for different underlying data types (e.g., a functio...read more

Java has feathers like platform independence, garbage collection, and strong typing. C is a low-level language with manual memory management.

• Java is platform-independent, meaning it can run on any platform without recompiling the code.

• Java has automatic garbage collection, which means the programmer doesn't have to manually free up memory.

• Java is strongly typed, which means the type of a variable is checked at compile-time.

• C is a low-level language, which means it is closer t...read more

A pointer is a variable that stores the memory address of another variable.

• Pointers are used to access and manipulate memory locations directly.

• They are often used in programming languages like C and C++.

• Example: int *ptr; // declaring a pointer variable

C++ is an extension of C language with object-oriented programming features.

• C++ supports classes and objects while C does not.

• C++ has better support for polymorphism and inheritance.

• C++ has a standard template library (STL) while C does not.

• C++ allows function overloading while C does not.

• C++ has exception handling while C does not.

The subtypes of SQL include MySQL, PostgreSQL, SQLite, Oracle, SQL Server, and more.

• MySQL

• PostgreSQL

• SQLite

• Oracle

• SQL Server

SQL left and right joins are used to combine rows from two or more tables based on a related column between them.

• 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.

• Use LEFT JOIN or RIGHT JOIN keywords in SQL queries to perform left and right joins.

SDLC (Software Development Life Cycle) is a structured process for developing software through various stages from planning to maintenance.

• 1. Requirements Gathering: Identify what the software needs to do. Example: User interviews to gather feature requests.

• 2. Design: Create architecture and design specifications. Example: UML diagrams to outline system structure.

• 3. Implementation: Write and compile the code. Example: Developers coding in Java or Python.

• 4. Testing: Validate t...read more

Inheritance is a fundamental concept in object-oriented programming that allows a class to inherit properties and methods from another class.

• Inheritance promotes code reusability by allowing new classes to use existing class functionality.

• There are different types of inheritance: single, multiple, multilevel, hierarchical, and hybrid.

• Example of single inheritance: Class 'Dog' inherits from class 'Animal'.

• Example of multiple inheritance: Class 'FlyingFish' inherits from both '...read more

Method overloading is when multiple methods in a class have the same name but different parameters.

• Allows a class to have multiple methods with the same name but different parameters

• Parameters can differ in number, type, or order

• Example: void print(int a), void print(int a, int b)

Oops concepts are the principles of Object-Oriented Programming that help in creating modular and reusable code.

• Encapsulation: Binding data and functions together in a single unit called class.

• Inheritance: Acquiring properties of one class by another class.

• Polymorphism: Ability of an object to take many forms.

• Abstraction: Hiding the implementation details and showing only the necessary information to the user.

An operating system (OS) manages computer hardware and software, providing services for computer programs.

• An OS acts as an intermediary between users and the computer hardware.

• Examples of operating systems include Windows, macOS, Linux, and Android.

• The OS manages system resources like CPU, memory, and storage.

• It provides a user interface, which can be command-line or graphical.

• Operating systems handle file management, security, and process management.

JavaScript is a high-level, interpreted programming language used for creating interactive websites.

• JavaScript is commonly used for client-side web development.

• It can be used to create dynamic and interactive elements on web pages.

• JavaScript can also be used for server-side development with Node.js.

• It is a versatile language that can be used for creating web applications, games, and more.

Oops in C stands for Object-Oriented Programming concepts like classes, objects, inheritance, polymorphism, and encapsulation.

• Oops in C refers to the implementation of object-oriented programming concepts such as classes, objects, inheritance, polymorphism, and encapsulation.

• It allows for the creation of reusable code through the use of classes and objects.

• Inheritance enables the creation of new classes based on existing classes, promoting code reusability.

• Polymorphism allows...read more

Network layers are a set of protocols that define the communication between devices in a network.

• There are seven network layers in the OSI model

• Each layer has a specific function and interacts with adjacent layers

• Examples include physical layer, data link layer, network layer, transport layer, session layer, presentation layer, and application layer

OOPs concepts are the fundamental principles of object-oriented programming.

• Encapsulation - binding data and functions together

• Inheritance - creating new classes from existing ones

• Polymorphism - ability of objects to take on many forms

• Abstraction - hiding implementation details from users

• Example: A car is an object that encapsulates data like speed and functions like accelerate and brake

• Example: A child class can inherit properties and methods from a parent class

• Example: A sh...read more

Node.js is a runtime environment that allows you to run JavaScript on the server side.

• Node.js is built on Chrome's V8 JavaScript engine.

• It uses an event-driven, non-blocking I/O model.

• Node.js is commonly used for building server-side applications.

• It allows developers to use JavaScript for both client-side and server-side programming.

• Node.js has a large ecosystem of open-source libraries and frameworks.

C is a procedural programming language while C++ is an object-oriented programming language.

• C is a subset of C++

• C does not support classes and objects, while C++ does

• C is a procedural language, while C++ supports both procedural and object-oriented programming

• C++ has features like function overloading, templates, and exception handling which are not present in C

• C++ allows the use of namespaces for organizing code, which is not available in C

OOP (Object-Oriented Programming) is a programming paradigm based on objects, encapsulation, inheritance, and polymorphism.

• Encapsulation: Bundling data and methods that operate on the data within one unit (e.g., a class).

• Inheritance: Mechanism where a new class derives properties and behavior from an existing class (e.g., a 'Dog' class inheriting from an 'Animal' class).

• Polymorphism: Ability to present the same interface for different data types (e.g., a function that can tak...read more

OOPs (Object-Oriented Programming) is a programming paradigm based on the concept of objects, which can contain data and code.

• OOPs focuses on creating objects that interact with each other to solve problems.

• It involves concepts like classes, objects, inheritance, polymorphism, and encapsulation.

• For example, a car class can have objects like BMW, Audi, and Mercedes, each with their own properties and methods.

OOPS stands for Object-Oriented Programming System. It is a programming paradigm based on the concept of objects.

• OOPS focuses on creating objects that contain data and methods to manipulate that data.

• It allows for encapsulation, inheritance, and polymorphism.

• Encapsulation refers to the bundling of data with the methods that operate on that data within a single unit.

• Inheritance allows classes to inherit attributes and methods from other classes.

• Polymorphism allows objects to b...read more