Oracle Database Foundations

1.2. Relational Databases

The relational model is the basis for any relational database management system (RDBMS). A relational model has three core components: a collection of objects or relations, operators that act on the objects or relations, and data integrity methods. In other words, it has a place to store the data, a way to create and retrieve the data, and a way to make sure that the data is logically consistent.

Hierarchical and Network Databases Dr. E. F. Codd first proposed the relational model in 1970. At that time, databases were primarily either of the hierarchical or network type. A hierarchical database is similar in nature to a filesystem, with a root or parent node and one or more children referencing the parent. This makes ...