Unit 18 Database Design Extended Diploma in ICT Julie Hodsdon

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Presentation transcript:

Unit 18 Database Design Extended Diploma in ICT Julie Hodsdon Normalisation 2 Unit 18 Database Design Extended Diploma in ICT Julie Hodsdon

Modelling The ERD is a top down method of modelling the real life business Normalisation is a bottom up method Often based on existing system (possibly paper) Both methods can be used They may give different results and the designer has to decide which ones to implement

Example Spreadsheet

ERD

Normalisation

Purpose of normalisation Make sure the table Has a field that uniquely identifies each row (the primary key) Does not contain duplicate fields Does not repeat the same type of values Does not contain fields that belong in other fields

Purpose of normalisation Make sure fields Represent a characteristic of the table subject Contain a single value Are atomic (not multipart) Are not calculated Are unique throughout the database Have an appropriate name

How the Tables Look

How the Tables Look