A short introduction to database systems.ppt
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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.
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- 1. Rafael Tolosana 19 th February 2009 A short Introduction To Database Systems
- 2. About myself Profesor Ayudante (Graduate Assistant Professor) at the Computer Science and Systems Engineering Department Email address [email_address] Timetable for student advice (tutorías) Mondays 10-14 hours
- 3. Vocabulary for today D atabase Relational Database T able R elation To Retrieve To Query / query Form Report Tuple or Record Attribute Base de datos Base de datos relacional Tabla Relación Recuperar Consultar/ consulta Formulario Informe Tupla o Registro Atributo
- 4. Information vs Data Information: facts about a situation, person, event, etc. Data = Organised / Structured information Information System i.e. google Database management system i.e. the Social Security Database Management System
- 5. Database Concept Definition : A database is a collection of elements that allows you to store data, organise it and retrieve it in any way you want. There are many different types of databases, the most utilised one is the relational database type
- 6. Relational Database Definition : A Relational Database is a collection of relations which are frequently called tables (but also relations) Elements of a Table or Table Picture extracted from Wikipedia Record or
- 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
- 8. Operations in a Relational Database Tables can be related one another RDBMSs provide functionality for relating tables Operations within a table: Insert a record (row) Delete a record Update a record Query for specific records that satisfy a condition
- 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