LIKE conditions are search conditions with a LIKE predicate, for which the following applies:
· The operator is the operator LIKE.
·
LIKE conditions
have the following format:
<column_spec> LIKE
<extended_value_spec>
· The value specification used (extended_value_spec) must not begin with the match_string or match_set SQL syntax elements of a LIKE predicate.
To determine an optimal search strategy, Optimizer can only use LIKE conditions that satisfy these prerequisites.
Conditions with a format ...NOT (<column_spec> NOT LIKE <extended_value_spec>) are, where possible, converted into an <column_spec> LIKE <extended_value_spec> expression. Optimizer then continues to process this modified condition.