'not' for instance is a unary operator. It is unary in the sense that it operates on a single item. In contrast a binary operator such as addition operates on two items.
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Unary RelationshipsUnary relationships have only one participant-the relation is associated with itself. The classic example of a unary relationship is Employee to Manager. One's manager is, in most cases, also an employee with a manager of his or her own.
In mathematics, unary operations are functions having only one number for an input. These include functions such as finding squares, square roots, and reciprocals for a number.
The nnary and Binary operators in relational Algebra.
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It is a number system with the base 1, so for example 1 would be represented with |, 2 with , 5 with | etc.