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Broadly, functional requirements define what a system is supposed to do and non-functional requirements define how a system is supposed to be mathematical function, a black box description input, output, process and control functional model or IPO Model.roadly, functional requirements define what a system is supposed to do and non-functional requirements define how a system is supposed to be mathematical function, a black box description input, output, process and control functional model or IPO Model.
The requirements to meet second normal form is that the database must be in first normal form and have full functional dependency. Functional Dependency Functional dependency occurs when all non-key attributes are dependent on the primary key. So if a table has only one primary key, it is fully functional dependent. The figure above does not meet the requirements of second normal form because the non-primary attribute (Item Name) is only dependent on the primary key (Item #). This one table should be broken into two.