Three schema approach

The three schema approach is a way to organize data in a database. The three schema are:

1. Conceptual Schema: This is like a blueprint that shows all of the different kinds of data that will be stored in the database.

2. Internal Schema: This is like the actual table that holds all of the data. It has all of the columns and rows for data to be stored.

3. External Schema: This is like a view of the data, so that it can be seen in different ways for different people. It can tell the database what data to show to certain users.