46
Operational relationship
is
used to
label any condition
in
which one or
more
optional
relationship
exits.
Therefore,
this
relationship
can
be
using it or cannot be using it.
Symbols
Meaning
X-to-one relationship
X-to-many relationship
Mandatory relationship
Optional relationship
Table 2. 2
Entity Relationship Diagram Symbols
The example of the ERD is
Figure 2. 3 ERD created using the Structure Analysis Technique (satzinger,
pr.53)
 |