An example of a relational expression is 4 ` " 4, which evaluates to false.
2.
The unique aspect of Dataphor's user interface " derivation " is that it may be based on any relational expression ( query ) rather than merely base tables.
3.
The absolutive state occurs when a relational expression is transformed into an absolute expression, or when a predicate becomes an argument that can then be assigned to a particular place in a predicate.
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