top of hierarchy

DATA BASE ARCHITECTURE

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USEFULL FOR FYBSC (IT) & TYBSC (CS) STUDENTS

 

DATABASE MODEL

  •  A database model defines the logical design of data. The model describes the relationships between different parts of the data.
  • Basically three models are  –

(i)                Hierarchical model

(ii)              Network model

(iii)            Relational model

  •  Hierarchical model

In his model each entity has only one parent but can have several children. At the top of hierarchy there is only one entity which is called ROOT.

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  • Network model

In the network model, entities are organized in a graph, in which some entities can be accessed through several paths.

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  • Relational model

In this model, data is organized in two-dimensional tables called relations. The tables or relation are related to each other.

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