A database schema defines the structure of a relational database, including tables, columns, relationships, constraints, and indexes. Schemas act as the blueprint for how data is organized and validated. They enforce data integrity and support efficient querying.
Why it matters
A well-designed schema improves performance, prevents inconsistencies, and simplifies application logic. Schema changes are typically managed through version-controlled database migrations.
Examples
Creating tables for users, orders, and payments with appropriate primary and foreign keys. Lessons like Tables, Rows, and Columns provide detailed insights.