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P: 16/03/2020

Master in Informatics and Computing Engineering
Database and Web Applications Laboratory
Instance: 2019/2020

Practical work #6 :: Week of 16/03/2020


By the end of this class, the student should be able to:

  • Develop the Relational schema from the Conceptual schema.
  • Ensure that the Relational schema is in the Boyce-Codd normal form (BCNF).
  • Document the Relational database schema.



  • Present the artefact A4 (Conceptual Data Model).
  • Map the classes and relationships of the conceptual schema into relation schemas.
  • For each relation, identify the functional dependencies (FD) that apply, according to the semantics of the application, and get the minimum coverage.
  • If the relation is not in BCNF and there are no other impediments, look for several possible decompositions (lossless) in relations in BCNF and choose the "best decomposition" (which preserves more dependencies, that makes more sense, etc. ).
  • If there is no satisfactory decomposition to BCNF and if the relation is no longer in 3NF, consider the decomposition lossless for 3NF, preserving the functional dependencies.


  • Obtain the Relational Schema. Normalisation and Schema Refinement. Relational Schema Documentation. Presentation of artefact A4 (Conceptual Data Model).1)

LBAW, 2019/20

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Obtenção do Esquema Relacional. Refinamento e Normalização do Esquema Relacional. Documentação do Esquema Relacional. Apresentação do artefacto A4 (Modelo Conceptual de Dados).
teach/lbaw/labs/06.txt · Last modified: 14/03/2020 11:03 by Sérgio Nunes