Progettazione Logica Giorgio Ghelli. Logical modeling2 The relational data model All data in flat tables of rows with a primary key (access operators:

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Presentation transcript:

Progettazione Logica Giorgio Ghelli

Logical modeling2 The relational data model All data in flat tables of rows with a primary key (access operators: later) Associations as foreign keys Employees EmpIdNameSalaryDepId 232John1000Y1 143Mary1200X2 254Joan900Y1 Departments DepIdBudget Y X

Logical modeling3 The relational data model: graphic notation Employees EmpId DepId Name Salary Departments DepId Budget EmployeesDepartments EmployeesDepartments  1

Logical modeling4 Phases of database design Conceptual design Logical design Physical design

Logical modeling5 Translating a conceptual plan to the relational model Add an artificial primary key to any collection which needs one Translate associations and inclusions into foreign keys Flatten complex attributes Translate multivalued attributes into tables

Logical modeling6 Translating a conceptual plan 1-N associations become foreign keys employees departments employees departments

Logical modeling7 M-N associations Encoded as a table with two foreign keys Employees EmpIdName John Mary Joan... Projects BudgetPrId 23000P P2 ProEmp PIdEId P1232 P1143 P2232 P2254

Logical modeling8 M-N associations M-N associations become tables They get association attributes employees projects employees projects ProEmp Percentage

Logical modeling9 Subcollections Conceptual: –Persons(PId, Name) Employees ext Persons(Dept, Salary) Consultants ext Persons(Project, Fee) Logical: ?

Logical modeling10 Subcollections Conceptual: –Persons(PId, Name) Employees ext Persons(Dept, Salary) Consultants ext Persons(Project, Fee) Logical: –Persons(PId, Name) Employees(Dept, Salary, PId*) Consultants(Project, Fee, PId*) –Persons(PId, Name, Kind, Dept, Salary, Project, Fee)

Logical modeling11 Subcollections persons pId name employees dept salary persons pId name employees dept salary persons code name dept salary code kind

Logical modeling12 All together, now persons father-of families tax-payersflats inhabits percentage