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SQL Reference
SQL Reference : OpenEdge SQL Language Elements : Data types : Relational operators : Basic Predicate
Basic Predicate
A basic predicate compares two values using a relational operator. If a basic predicate specifies a query expression, then the query expression must return a single value. Basic predicates often specify an inner join.
If the value of any expression is null or the query_expression does not return any value, then the result of the predicate is set to false.


This is the syntax for a basic predicate:
expression relop { expression | ( query_expression ) }