S - Single Responsibility Principle

A class should have only one reason to change. Each class must have a single responsibility.

O - Open/Closed Principle

Entities should be open for extension, but closed for modification.

L - Liskov Substitution Principle

Objects of a superclass should be replaceable with objects of their subclasses without breaking the application.

I - Interface Segregation Principle

Clients should not be forced to depend on interfaces they don't use. Prefer specific interfaces.

D - Dependency Inversion Principle

Depend on abstractions, not concrete implementations. High-level modules should not depend on low-level modules.

SOLID Architecture app screenshot
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Complete SQL course with guided lessons, challenges, integrated IDE and completion certificate. Learn databases and queries for exams, IT and dev career.

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