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Four main types of data bases models are
Hierarchical database model.
Relational model.
Network model.
Object-oriented database model.
Entity-relationship model.
Document model.
Entity-attribute-value model.
Star schema.
Advantages of a data bases
Reduced data redundancy.
Reduced updating errors and increased consistency.
Greater data integrity and independence from applications programs.
Improved data access to users through use of host and query languages.
Improved data security.
Reduced data entry, storage, and retrieval costs.
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