Overview of the Table Structure

When a new data request comes in, like analyzing top-selling products or identifying at-risk customers, our ability to respond quickly depends on understanding our database’s structure.

Think of it as the blueprint of a house. Without knowing which room leads where, we’ll wander around trying to make sense of things. In this lesson, we’ll explore the structure of the OnlineStore database, which we’ll use throughout the course.

We’ll walk through each key table, understand what information they hold, and see how they connect. This knowledge sets us up to apply SQL patterns with accuracy and intention.

By the end of this lesson, we will:

• Understand the purpose and structure of each core table in the database.

• Learn how the tables are related through keys and relationships.

Categories and Products

These two tables define the backbone of what the store offers and how each item is organized.

The Categories table contains high-level groupings such as ...