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2. Entity Relationship Model in DBMS
1.
2.
3.
Entity Sets
customer and loan customer-id customer- customer- customer- loan- amount name street city number
4.
5.
Composite Attributes
6.
7.
Relationship Set
borrower
8.
9.
10.
11.
Mapping Cardinalities One
to one One to many Note: Some elements in A and B may not be mapped to any elements in the other set
12.
Mapping Cardinalities
Many to one Many to many Note: Some elements in A and B may not be mapped to any elements in the other set
13.
14.
15.
E-R Diagram With
Composite, Multivalued, and Derived Attributes
16.
Relationship Sets with
Attributes
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
E-R Diagram
with a Ternary Relationship
27.
28.
29.
30.
31.
32.
How about doing
an ER design interactively on the board? Suggest an application to be modeled.
33.
34.
35.
36.
37.
38.
Specialization Example
39.
40.
41.
42.
43.
44.
45.
E-R Diagram With
Aggregation
46.
47.
E-R Diagram for
a Banking Enterprise
48.
How about doing
another ER design interactively on the board?
49.
Summary of Symbols
Used in E-R Notation
50.
Summary of Symbols
(Cont.)
51.
Alternative E-R Notations
52.
53.
Summary of UML
Class Diagram Notation
54.
55.
UML Class Diagram
Notation (Cont.) * Note reversal of position in cardinality constraint depiction * Generalization can use merged or separate arrows independent of disjoint/overlapping overlapping disjoint
56.
57.
58.
59.
60.
61.
62.
63.
64.
65.
66.
67.
68.
End of Chapter
2
69.
E-R Diagram for
Exercise 2.10
70.
E-R Diagram for
Exercise 2.15
71.
E-R Diagram for
Exercise 2.22
72.
E-R Diagram for
Exercise 2.15
73.
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