This document provides an introduction to database systems. It defines a database as a collection of elements that allows users to store, organize, and retrieve data in any way desired. The most common type of database is the relational database, which consists of relations called tables that contain records made up of attributes. Operations in a relational database include inserting, deleting, updating records within tables, and querying tables to retrieve specific records that meet conditions.

1. Rafael Tolosana 19 th February 2009 A short Introduction To Database Systems

7. Table Example: Student info at unizar 456913 541131 221023 Rafael Tolosana [email_address] John Smith Carlos Pérez María de Luna, s/n María de Luna, s/n María de Luna, s/n [email_address] [email_address] Student PIN Student Name Address Email Address

9. Table Example: Student info at unizar 456913 541131 221023 Rafael Tolosana [email_address] John Smith Carlos Pérez María de Luna, s/n María de Luna, s/n María de Luna, s/n [email_address] [email_address] Student PIN Student Name Address Email Address