notes about databases

Mehr dazu

Industrial Control Systems Security

von MariaEs Martinez

Backups and recovery

von Liam LeCarpentier

Functions Of The Skeletal System

von Tyeller Truitt

How to solve math problems

von Thomas Teepe

notes about databases

three ways you can organise data a.k.a data processing

data types

present the facts in a interesting way. for example print a report or a graph

work out new facts from the ones you alresdy have.for example work out an average from a lonf list of number s

organise facts into a simple order like words in a dictoinary or names in a phone book

relational database

a datbase containinh two or more tables that are linked to each other. this overcomes problems problems of data redundancy, resting in fewer entry errors and reduce storage space

data processing

when data is organised to make it more useful it is called information

RAW facts and figures in a disorganised state are called DATA

definition

a data base is a structured collection of info stored on a computer system

key feild

also called primary key. a feild in a table which uniquely identifie each record in tht table

remove duplicate data makes thing quicker and faster ruduces storage space