2 Relational Database Management Systems
The relational data model is based on the concept of storing records of data as rows inside tables. Each row represents an entity of the real world with table columns being attributes (or properties) of interest of these entities. The relational data model has been the predominant data model of database systems for several decades. Relational Database Management Systems (RDBMSs) have been a commercial success since the 1980s. There are powerful systems on the market with lots of functionalities. These systems also fulfill all the basic requirements for database systems as introduced in Section 1.1. In the following sections, we briefly review the main concepts and terminology of the relational data model. ...
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