ARTICLE
rel_exp - Predicate Functions
The return value of a predicate function is a
logical value . A predicate function is
a special formulation of a
relational expression and, like any relational expression, can be a
full logical expression or part of
a logical expression. This means it can be specified as a condition in
control statements , as an argument
in Boolean functions , or in joins with
Boolean operators .
Predicate Functions for
Character-Like Arguments
Predicate Functions for Table-Like
Arguments
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