Data Types

Every column in a SQL table has a data type, which is a rule that tells the database what kind of values it can store.

Understanding data types helps you design tables that store information efficiently, minimize errors, and improve performance.

You can find the following information in the slides:

• Why data types matter in schema design
• How different types (e.g., TEXT, INT, REAL) behave
• Where you'll typically use each type in real-world applications

In the next lesson, you'll learn how SQL handles missing values using NULL and how to prevent them using NOT NULL.