04.06.2015 Views

Database Modeling and Design

Database Modeling and Design

Database Modeling and Design

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

4.5 Entity Clustering for ER Models 79<br />

Company<br />

organization<br />

functional<br />

area<br />

Division<br />

1<br />

1<br />

contains<br />

N<br />

Department<br />

1<br />

1<br />

has<br />

ismanaged-by<br />

isheaded-by<br />

Project<br />

management<br />

functional<br />

area<br />

Skill<br />

N<br />

Project<br />

N<br />

1<br />

skill-used<br />

assigned-to<br />

N<br />

N<br />

N 1 1<br />

Employee<br />

1<br />

1<br />

1<br />

N<br />

ismarried-to<br />

+<br />

manages<br />

N<br />

Location<br />

Employee<br />

data<br />

functional<br />

area<br />

d<br />

Manager<br />

Secretary<br />

Engineer<br />

Technician<br />

1<br />

1<br />

1<br />

N<br />

is-allocated<br />

is-allocated<br />

hasallocated<br />

belongs-to<br />

1<br />

1<br />

1<br />

N<br />

Desktop<br />

Workstation<br />

Prof-assoc<br />

Figure 4.10<br />

ER diagram: clustering technique

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!