In this lesson, we’ll learn how to connect data between different tables in your database.
So far, we’ve worked with single tables (users), but real applications need data that relates to each other.
Remember from Lesson 1 that we chose SQL databases because they’re “great for apps with relationships” - now we’ll learn how to implement those relationships. We’ll explore the concept of relationships by connecting users to the posts they write.
You’ll learn about foreign keys, simple JOIN queries, and how to build API endpoints that work with connected data.
By the end, you’ll understand how to design and query related data, which is essential for building real-world applications.