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1 Entity-Relationship Modeling
2 ER Graphical modeling technique Informal, understandable for laymen Coarse technique to design tables Provides rules of thumb for mapping to table structures
3 Entities and attributes
4 Relations (associations)
5 Recursive relations With roles
6 Weak entities
8 Cardinality & optionality ( 0,n) (1,1) optional mandatory
ERD -> relational schema
Solution 1 E1 (K1, A1, …, Am, K2) E2 (K2, B1, …, Bn) Solution 2 E1 (K1, A1, …, Am) E2 (K2, B1, …, Bn, K1)
ERD -> relational schema Solution 3 E1 (K1, A1, …, Am, K2) E2 (K2, B1, …, Bn, K1)
ERD -> relational schema Solution 4 E1 (K1, A1, …, Am) E2 (K2, B1, …, Bn) R (K1, K2)
Translating from ER to Relationship Schema Adapted from Juliana Freire.
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