isNot
isNot is a term used in programming to describe the negated form of the identity-checking operator, or, in SQL contexts, the negation of the IS predicate. In many languages, the basic operator is is, which tests whether two references point to the exact same object (identity) rather than whether their values are equal. The negated form is written as is not or isNot in documentation and code samples, and it yields true when the operands do not refer to the same object.
In Python, is and is not compare identity. They are distinct from value equality operators, == and !=.
In SQL, IS NOT is a binary predicate used for NULL checks and certain boolean comparisons. For
Other languages may implement negation of a comparison with different syntax, such as not in front of