How do you usually create and design databases?

The process of designing a database starts with analyzing requirements and understanding the domain. Then, an ER diagram (Entity-Relationship) is created to visualize entities and their relationships. After that, data types, keys (primary and foreign), indexes, and integrity constraints are defined.

For relational databases, normalization is important to avoid redundancy and update anomalies. Depending on the task, denormalization can be used to optimize read performance.

Example of a simple table definition in SQL:

CREATE TABLE Users (
    UserId INT PRIMARY KEY,
    UserName NVARCHAR(100) NOT NULL,
    Email NVARCHAR(255) UNIQUE NOT NULL
);

In C#, when working with Entity Framework, I model classes that reflect the table structure and configure relationships via navigation properties and attributes or Fluent API.