Database Courses ? 3 (Relations )
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..
Yoruma Açığız! :)