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Oracle Academy Arcs Prof. Carmen Popescu Oracle Academy Lead Adjunct

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Oracle Academy. Arcs. Prof. Carmen Popescu Oracle Academy Lead Adjunct. Arcs Section 7 – Lesson 3. Arcs represent MUTUALLY EXCLUSIVE relationships. - PowerPoint PPT Presentation

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Page 1: Oracle Academy

Oracle Academy

ArcsProf. Carmen Popescu

Oracle Academy Lead Adjunct

Page 2: Oracle Academy

Slide 2 / 6

ArcsSection 7 – Lesson 3

Arcs represent MUTUALLY EXCLUSIVE relationships

ELEV

SCOALA GENERALA

LICEU

SAM

Fiecare elev poate merge FIE la scoala generala FIE la LICEU fie la SAM dar poate sa nu mearga la nici una din ele pt. ca relatiile pe care este pus arcul sunt optionale

Page 3: Oracle Academy

Slide 3 / 6

ArcsSection 7 – Lesson 3

ELEV

SCOALA GENERALA

LICEU

SAM

Fiecare elev TREBUIE sa mearga FIE la scoala generala FIE la liceu fie la SAM dar obligatoriu merge la una din ele pt. ca relatiile pe care este pus arcul sunt obligatorii

Page 4: Oracle Academy

Slide 4 / 6

ArcsSection 7 – Lesson 3

Arcurile pot fi modelate utilizand subtipurile

ELEV

ELEV DE SC. GENERALA

ELEV DE LICEU

ELEV DE SAM

ELEV

SCOALA GENERALA

LICEU

SAM

Page 5: Oracle Academy

Slide 5 / 6

ArcsSection 7 – Lesson 3

Arcurile pot fi modelate utilizand subtipurile

ELEV

SCOALA GENERALA

LICEU

SAM

ELEV

ELEV DE SC. GENERALA

ELEV DE LICEU

ELEV DE SAM OTHER

Page 6: Oracle Academy

Slide 6 / 6

ArcsSection 7 – Lesson 3

Use supertypes/subtypes when you want to represent classifications or types of things.

Use arcs when you want to represent mutually exclusive relationships between entities.


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