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Fifth Normal Form (5NF)
These relations still have a difficulty. While defining the 4NF we mentioned that all the attributes depend upon each other. Whereas creating the two tables in the 4NF, although we have preserved the dependencies among Vendor Code and Item code in the first table and Vendor Code and Item code in the second table, we have lost the relationship among Item Code and Project No. If there were a primary key then this loss of dependency would not have happened..
how oracle can be used
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what is natural join?
Can we delete data element, which is being used by table fields. No we cant delete data element.
What is the need for triggers? Triggers are useful mechanisms for alerting humans or for starting particular tasks automatically when particular conditions are met.
These are the binary operations; i.e., each is applied to two relations or sets. These two relations can be union compatible excluding in case of Cartesian product. Two relations R
In an E-R diagram how attributes are represented ? In an E-R diagram attributes are represented in a ellipse.
it can be possible to create any table without primary key
What is the most significant feature that does not directly map into programming language structures? Why? Association, since there are complex types of association, like as qu
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