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Remove repeating data items - PowerPoint PPT Presentation

Relational Database Systems

Relational Database Systems. Higher Information Systems. The Relational Model. data is grouped into entities which are related, in order to minimise data duplication and achieve data integrity many-to-many relationships between entities are removed and replaced with one-to-many relationships.

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Relational Database Systems

Relational Database Systems. Bit and Bobs Worked Example. Normalisation. Un-normalised Form (UNF). Identify an entity List all the attributes Identify a key. Un-normalised Form (UNF). Identify repeating data items. Un-normalised Form (UNF). Identify repeating data items.

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327 views • 26 slides

Normalisation

Normalisation. Un-normalised Form (UNF). Identify an entity List all the attributes Identify a key. Un-normalised Form (UNF). Identify repeating data items. Un-normalised Form (UNF). Identify repeating data items. First Normal Form (1NF). Remove repeating data items to form a new entity

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407 views • 25 slides

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Remove repeating data items - PowerPoint PPT Presentation

Relational Database Systems

Relational Database Systems

Normalisation