RELATIONS

? One-to-One Relation

An entity may be related to zero or one entity

in another entity set.

?  Like Chairman – Department Relation
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?One-to-Many Relation

An entity may be related to zero or more entities

in another entity set.

?  Like Department – Student Relation

(If we don?t think about ÇAP or YANDAL :p )

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? Many-to-One Relation

Just the opposite of One-to-Many Relation. An entity

may be related to zero or one entity in another one.

? Like Student – Department Relation

(Again don?t think about ÇAP or YANDAL 😀 )

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? Many-to-Many Relation

Any entity or entities may be related zero or more entities

in another entity set.

? Like Student – Course Relation

See you soon..