Relational Database Relational database stores data in the form of tables (also called a relation) with different tables linked to each other via some data item.

Database normalization is the cornerstone of database theory. Once a database is normalized, relationships between the data in multiple tables must be established.

Four database types Relational A relational-database management system (RDBMS) is a series of tables with a defined schema, or layout, with records in rows of one or more attributes, or values.