R Systems International Interview Questions, Process, and Tips for Freshers

Left join includes all records from the left table and matching records from the right table, while inner join only includes matching records from both tables.

• Left join retains all records from the left table, even if there are no matches in the right table.

• Inner join only includes records that have matching values in both tables.

• Left join is useful for including all data from one table, while inner join is used to onl

Ranking where 2 people have the same marks in a dataset.

• Identify the individuals with the same marks.

• Assign them the same rank.

• Adjust the subsequent ranks accordingly.

Factory pattern is a creational design pattern that provides an interface for creating objects in a superclass, but allows subclasses to alter the type of objects that will be created.

• Factory pattern is used to create objects without specifying the exact class of object that will be created.

• It provides a way to delegate the instantiation logic to child classes.

• Commonly used in situations where a class can't anticipate ...read more

Dependency injection is a design pattern where components are given their dependencies rather than creating them internally.

• Allows for better code reusability and testability

• Reduces coupling between components

• Promotes separation of concerns

• Examples: Constructor injection, Setter injection, Interface injection

Design principles are guidelines for designing software solutions, while design patterns are reusable solutions to common design problems.

• Design principles are high-level guidelines that help in designing software solutions that are scalable, maintainable, and efficient.

• Design patterns are reusable solutions to common design problems that have been proven to be effective in various scenarios.

• Examples of design principl...read more