According To 3 Nf
According To 3 Nf. Before proceeding to next normal forms, we should find candidate Now check for BCNF. We have seen in the previous lecture that it is not always possible to have a BCNF design that is also dependency preserving.
According to the definition of BCNF left hand side should be key. In other words, between BCNF and dependency preserving, we must choose one and compromise the other. These three "normal forms" or normalizations tend to confound people who aren't professional database You can also understand the three cascading normal forms in relation to each other — that normalization proceeds according to these steps.
Before proceeding to next normal forms, we should find candidate Now check for BCNF.
According to the definition of BCNF left hand side should be key.
This includes creating tables and establishing relationships between those tables according to rules designed both to protect the data and to make the database more flexible by eliminating redundancy and inconsistent dependency. Redundant data wastes disk space and creates maintenance problems. The other condition is there should be no transitive.
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