Физическая модель БД для ЕМ
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Employee |
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Contact |
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employee_id |
CHAR(4) |
<pk> |
not null |
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contact_id |
CHAR(5) |
<pk> not null |
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first_name |
VARCHAR2(20) |
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null |
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organization |
VARCHAR2(80) |
null |
family_name |
VARCHAR2(40) |
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not null |
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first_name |
VARCHAR2(20) |
null |
login_name |
VARCHAR2(40) |
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<i> not null |
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family_name |
VARCHAR2(40) |
not null |
employee_email VARCHAR2(60) |
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not null |
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contact_email |
VARCHAR2(60) |
null |
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login_UN |
<i> |
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contact_id = conact_id |
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0..* |
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employee_id = creator_emp_id |
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OutMessage |
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message_id |
INTEGER |
<pk> |
not null |
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conact_id |
CHAR(5) |
<fk1> |
not null |
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creator_emp_id |
CHAR(4) |
<fk2> |
not null |
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0..* |
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employee_id = sender_emp_id |
sender_emp_id |
CHAR(4) |
<fk3> |
null |
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message_subject |
VARCHAR2(40) |
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not null |
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0..* |
message_text |
VARCHAR2(255) |
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not null |
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date_created |
DATE |
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not null |
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date_emailed |
DATE |
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null |
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Проектирование ПО. Проектирование БД |
22 |
Связи моделей данных в Power
Designer
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Концептуальная |
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модель (Conceptual |
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data model) |
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Логическая модель |
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Объектно- |
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ориентированная модель |
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(Logical data model) |
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(Object-oriented model) |
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Физическая модель |
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C#, Java |
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(Physical data model) |
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БД |
DDL |
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23 |
Проектирование ПО. Проектирование БД |