What is a Database Schema?

In database terms, a schema (pronounced “skee-muh” or “skee-mah”) is the organisation and structure of a database. Both schemas and schemata can be used as plural forms.

A schema contains schema objects, which could be tablescolumns, data types, views, stored procedures, relationships, primary keys, foreign keys, etc.

A database schema can be represented in a visual diagram, which shows the database objects and their relationship with each other.

Screenshot of a database schema.
A basic schema diagram representing a small three-table database.

Above is a simple example of a schema diagram. It shows three tables, along with their data types, relationships between the tables, as well as their primary keys and foreign keys.

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