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log_exp - NOT

Other versions: 7.31 | 7.40 | 7.54

Syntax

... NOT log_exp ...

Effect

The negation of a logical expression log_exp using NOT creates a new logical expression that is false if the logical expression log_exp is true and vice versa.

Notes

• The operator NOT is a stronger join than AND, OR, and EQUIV.

• The Boolean operator NOT must not be confused with the addition NOT of the relational operators BETWEEN, IN, and the predicate operator IS. The following syntax is one possible example:

... NOT operand NOT IN seltab ...

The first NOT is a Boolean operator that negates a comparison expression. The second NOT is a part of the comparison expression withe the relational operator IN. This is made clear using parentheses around the comparison expression:

... NOT ( operand NOT IN seltab ) ...