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Pertemuan 2 dan 3

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One-to-One Attribute

Relationships

Attributes that have a one-to-one relationship must

occur together in at least one relation

Call the relation R and the attributes A and B:

 Either A or B must be the key of R

 An attribute can be added to R if it is functionally determined by A or B

 An attribute that is not functionally determined by A or B cannot be added to R

(5)

Many-to-One Attribute

Relationships

Attributes that have a many-to-one

relationship can exist in a relation

together

Assume C determines D in relation S

C must be the key of S

An attribute can be added to S if it is

determined by C

(6)

Many-to-Many Attribute

Relationships

Attributes that have a many-to-many relationship

can exist in a relation together

Assume attributes E and F reside together in

relation T

 The key of T must be (E, F)

 An attribute can be added to T if it is determined by the combination (E, F)

 An attribute may not be added to T if it is not determined by the combination (E, F)

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Referensi

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