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EER - PowerPoint PPT Presentation


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EER. Domain of Attribute. Temel olarak alacağı değerler kümesini tanımlar Komposit birleşik alanlar için domain O alanların kartezyen çarpımına eşit olacaktır. Example. Company Department DepID , Name, Number of Employees, Manager … Project

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domain of attribute
Domain of Attribute
  • Temelolarakalacağıdeğerlerkümesinitanımlar
  • Kompositbirleşikalanlariçin domain
    • O alanlarınkartezyençarpımınaeşitolacaktır
example
Example
  • Company
    • Department
      • DepID, Name, Number of Employees, Manager …
    • Project
      • ProjectID, Name, Team strenghtLoacation.
    • Employee
      • Emp_ID, Name (F M L), Gender, address salary
realtionship
Realtionship
  • 2 veyadahafazlavarlıkarasıolması
  • Anlatırki her bridepartmenbiremloyeetarafındayönetilmeli
  • E1, E2
relationship
Relationship
  • İlişkininderecesikatılanvarlıklarınsayısınıiçerir
  • Unary, binary, ternary
    • Unary ???
    • Örnek