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Databases

Description

AS Levels A2 ICT - Use and Impact of ICT (6. Database Systems) Mind Map on Databases, created by Henry Cookson on 15/12/2014.

Mind Map by Henry Cookson, updated more than 1 year ago

	Created by Henry Cookson almost 10 years ago

Resource summary

Databases

Flat-file
1. Single table of data
2. Limited use from one pool of data
  1. Data redundancy: data can be entered over and over again like customer details for every order
Relational Databases
1. Advantages
  1. Data redundancy
  2. Data consistency
  3. Password access to allow access to certain areas for certian employees
2. Two or more tables
  1. With links
    1. Primary keys
    2. Foreign keys
Verification and Validation
1. Proof reading
2. Double entry

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