A unary operator that
returns an expression as a negative, numeric value.
Unary operators perform an operation on only one expression of any of
the data types of the numeric data type category.
(Negative) is a Caché SQL extension.
The following example returns three numeric fields: the Age column from
Sample.Person; the (Negative) value of the average of Age; and the
Age minus the average age:
-(AVG(age)) AS NegAvg,
Age-AVG(Age) AS AgeRelAvg