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Database Essentials
Introduction to Databases : Elements of a relational database

Elements of a relational database

Relational databases are based on the relational model. The relational model is a group of rules set forth by E. F. Codd based on mathematical principles (relational algebra), and it defines how database management systems should function. The basic structures of a relational database (as defined by the relational model) are tables, columns (or fields), rows (or records), and keys. This section describes these elements.
* Tables
* Rows
* Columns
* Keys
* Indexes