1. Chapters 15 &16 Conceptual and Logical Database Design Methodology

2. Agenda Definition Conceptual database design Relational database - logical design Example

3. Definition Design methodology –Structured design approach using procedures, techniques, tools and documentation aids Conceptual database design –Constructing an information model, independent from all physical consideration for an enterprise Logical database design –Building an organization database based on a specific data model

4. Conceptual Database Design Entities Relationships Attributes (simple, no composite, no derived) Attribute domains Primary and candidate key attributes –Minimal set of attributes –Less change –Uniqueness in the future –Fewest characters –Easy to use by users

5. Relational Database - Logical Design Draw ER model Review –Always binary with1 to many relationship –No complex relationship –No redundant relationship –No recursive relationship –No relationship with attribute(s)

6. Relational Database - Logical Design Normalize relations –Primary key –Foreign key –BCNF Add constraints –Domain & enterprise –Referential –Entity –legal

7. Relational Database - Logical Design Review –Organization current & future needs –All user current & future requirements –Normalization (Boyce-Codd) –Relationship (one-to-one or one-to-many) –Redundancy –Constraints User approval Document

8. Points To Remember Definition Conceptual database design Relational database - logical design Example

9. Assignment Review chapters 5-6, 11-16 Read chapters 17-18 Work on group project –E-R and normalized database due date: