Page 8 - الحاسب الآلي ثانية إرشاد 2

‫أﻧﻈﻤﺔ ﻗﻮاﻋﺪ اﻟﺒﻴﺎﻧﺎت‬ ‫اﻟﻔﺼﻞ اﻷول‬

IDS and ) ‫( ﻤﺜل‬DBMSs) The network model

The object –oriented (IDMS

(store and versant Object) model

(DBMSs) (object-relational model)

(and others Versant, Oracle, Objectstore, Infoimax, IBM,)

(Relational model )

(Object –oriented model)

. Relational model
Data Item
Data Item
Value
.٥٥٠
Group Data Item

.

. Last_name Mid-name .
First_name

. Elementary Data Item -
) Records and fields

( Entity

٨