Conceptual design with ER model - Tour management

Conceptual design with ER model: Conceptual design for complex projects. Common errors. Integrity constraints. Conceptual design validation.

Introduction to the relational model: Creating relations using SQL/DDL and inserting/updating and deleting data using SQL/DML. 

Conceptual design with ER model - Tour management

Conceptual design with ER model - Sopontes management

Conceptual design with the ER model. E/A modelling: Weak entities, aggregation and generalization

Several decisions: Entity versus attribute. Entity versus relationship. Binary versus ternary relationships. Aggregation versus ternary relationships.