Chapter 4 Conceptual Modeling of Databases with Entity-Relationship Diagrams and the Unified Modeling Language.

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Presentation transcript:

Chapter 4 Conceptual Modeling of Databases with Entity-Relationship Diagrams and the Unified Modeling Language

Copyright © 2005 Pearson Addison-Wesley. All rights reserved. 4-2 Figure 4.1 Fragment of the E-R diagram for the entity type P ERSON. Hobbies is multi- valued

Figure 4.2 E-R diagrams for several relationship types. End of arrow away from the head is the optional side of a 1:1 A line without other notation is m:n

Copyright © 2005 Pearson Addison-Wesley. All rights reserved. 4-4 Figure 4.3 Cardinality in the E-R model. No more than one instance of C for 2 instance of D-E; no more than 2 instances of D-E for 1 instance of C.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved. 4-5 Figure 4.4 Two ways to represent single-role key constraints. End of arrow away from the head is the optional side of a 1:1

Copyright © 2005 Pearson Addison-Wesley. All rights reserved. 4-6 Figure 4.5 Many-to-one, one-to-one, and many-to-many correspondences. * Means 0..n

Copyright © 2005 Pearson Addison-Wesley. All rights reserved. 4-7 Figure 4.6 Example of an E-R diagram with an I S A hierarchy.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved. 4-8 Figure 4.7 Using IsA for data partitioning.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved. 4-9 Figure 4.8 Participation constraints.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 4.9 Line-based representation vs. cardinality constraints.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 4.10 Non-exclusive part-of relationship in E-R.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 4.11 Exclusive part-of relationship in E-R: weak entities.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 4.12 Summary of the E-R notation.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 4.13 Translation of entity type PERSON into a relation.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 4.14 Translations of some relationships.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 4.15 Examples of UML classes.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 4.16 UML associations.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 4.17 UML associations with association classes.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 4.18 The meaning of the multiplicity constraint in UML.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 4.19 Cardinality vs. multiplicity.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 4.20 Cardinality constraints in E-R that cannot be represented using multiplicity in UML.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 4.21 Foreign keys in UML.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 4.22 IsA (or generalization) hierarchies in UML.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 4.23 UML representation of the participation constraint for class C in binary association type A.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 4.24 Participation constraints for ternary relationships.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 4.25 Aggregation: non-exclusive part-of association in UML.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 4.26 Composition: exclusive part-of association in UML.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 4.27 Summary of the UML notation.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 4.28 The IsA hierarchy of the PSSC enterprise.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 4.29 Client/broker information: first attempt.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 4.30 Client/broker information: second try.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 4.31 Trading information in the PSSC enterprise.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 4.32 Client/broker information in UML.

Figure 4.33 An E-R diagram for the Student Registration System.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 4.34 A schema for the Student Registration System—Part 1.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 4.35 A schema for the Student Registration System—Part 2.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 4.36 An alternative representation of the transcript information.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 4.37 Replacing the ternary relationship S OLD of Figure 4.2 with three binary relationships.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 4.38 E-R diagram for Exercise 4.17.