IN conditions are
search conditions with an IN predicate, to which the following rules apply:Only IN conditions that satisfy these prerequisites can use the Optimizer to determine an optimal
search strategy.Conditions in the format
...NOT (<column_spec> NOT IN (<extended_value_spec>,...)) or. ...NOT (<column_spec> NOT IN <subquery>) are, where possible, converted to an expression without NOT, and with a correspondingly negated operator. The system then continues processing the condition in this converted format.