when a relationship is optional then the value of the modality is zero.
when mandatory then the modality is one.
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I guess you will just have to google it my friend.. Yours Faithfully Gedz
modality |mə(ʊ)ˈdalɪti|noun (pl.modalities)1 [ mass noun ] modal quality: the harmony had a touch of modality.2 a particular mode in which something exists or is experienced or expressed.• a particular method or procedure: the modalities of troop withdrawals.• a particular form of sensory perception: the visual and auditory modalities.(from oxford dictionary)
there are 2 types of hashing techniques 1- Static hashing 2-Dynamic hashing
A database system is a term that is typically used to encapsulate the constructs of a data model, database Management system (DBMS) and database .. (natsume)
a functionaly dependency is an association between two relational attribute of same relational database.one of the attribute is known as determinant and the other one is determined.for the each value of determinant there is only one value associated of determined. graphicaly it can be represented A----->B .