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ERD Example
1.
2.
Figure 5.1 Fragment
of the E-R diagram for the entity type Person.
3.
Figure 5.2 Translation
of entity type Person into a relation.
4.
Figure 5.3 E-R
diagrams for several relationship types.
5.
Figure 5.4A Translations
of some relationships. (continued on next slide)
6.
Figure 5.4B
(continued) Translations of some relationships.
7.
Figure 5.5 Example
of an Is A hierarchy.
8.
Figure 5.6 Using
Is A for data fragmentation.
9.
Figure 5.7 Participation
constraints.
10.
Figure 5.8 The
Is A hierarchy of the PSSC enterprise..
11.
Figure 5.9 Client/broker
Information: first attempt.
12.
Figure 5.10 Client/broker
Information: second try.
13.
Figure 5.11 Trading
information in the PSSC enterprise.
14.
Figure 5.12 An
alternative representation of the transcript information.
15.
Figure 5.13 Replacing
the ternary relationship Sold of Figure 5.3 with three binary relationships.
16.
Figure 5.14 An
E-R diagram for the Student Registration System.
17.
Figure 5.15A A
schema for the Student Registration System—Part 1. (continued on next slide)
18.
Figure 5.15B
(continued) A schema for the Student Registration System—Part 1. (continued on next slide)
19.
Figure 5.15C
(continued) A schema for the Student Registration System—Part 1.
20.
Figure 5.16A A
schema for the Student Registration System—Part 2. (continued on next slide)
21.
Figure 5.16B
(continued) A schema for the Student Registration System—Part 2. (continued on next slide)
22.
Figure 5.16C
(continued) A schema for the Student Registration System—Part 3. (continued on next slide)