May 2020
Beginner
564 pages
14h 9m
English
Content preview from Learn SQL Database Programming
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The third normal form
The third normal form (3NF) is the second level of database normalization. You will need to complete 2NF before beginning this step. The primary reason to implement 3NF is to ensure that your tables aren't created so that dependencies between columns may cause inconsistency. Generally, if a database is described as normalized, then it's normalized according to the third normal form. This step will ensure that you are doing the following:
- Meeting the requirements of 2NF: You will need to make sure that your tables comply with 2NF before proceeding with 3NF.
- No attributes depend on other non-key attributes: This means that you will need to look at your tables and see whether more fields can be split into other tables ...
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