1. 2002.08.27 - SLIDE 1IS 257 - Fall 2002 Database Management: Discussion Session University of California, Berkeley School of Information Management and Systems SIMS 257: Database Management

2. 2002.08.27 - SLIDE 2IS 257 - Fall 2002 Agenda Review of the ER Model Exercise on the ER Modeling Discussion & Sharing Exercise on basic SQL Comments & Questions

3. 2002.08.27 - SLIDE 3IS 257 - Fall 2002 Database Design Requirement analysis Conceptual database design Logical database design Schema refinement Physical database design Security

4. 2002.08.27 - SLIDE 4IS 257 - Fall 2002 Entity-Relationship Model Describes/Model –Entities- real world objects, described using a set of attributes –Relationships- associations among two or more entities

5. 2002.08.27 - SLIDE 5IS 257 - Fall 2002 Entity-Relationship Model Features –Integrity constraints Key constraint- must be unique Participation constraint (on a relationship)- entity must have at least one relationship with other entity –Weak Entities- entity requires another entity to be uniquely identified –N-way relationship- relates more than two entities –ISA Hierarchies- allows for specific sub-types of entities