Question: Provide three comparisons between hierarchical, network and relational database models. You can present your answer in the table. (b) The relational database model is

Provide three comparisons between hierarchical, network and relational database models. You can present your answer in the table.

 

(b) The relational database model is the most widely used database. Justify this statement. 

 

(c) The object-relational database model is more secure than the relational model. Explain. 

 

(d) What is the integrity rule in the relational model?

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