Databases

Henry Cookson
Mind Map by Henry Cookson, updated more than 1 year ago
Henry Cookson
Created by Henry Cookson over 5 years ago
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AS Levels A2 ICT - Use and Impact of ICT (6. Database Systems) Mind Map on Databases, created by Henry Cookson on 12/15/2014.
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Resource summary

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