4. Elements of QUEL Statements : Qualifications : Clauses
 
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Clauses
A clause has the form
expr comp_op expr
where comp_op is a comparison operator. A clause can be enclosed in parentheses without affecting its interpretation, as in the following examples:
(e.age < 50)
((j.salary*12)  >=  20000)
A clause returns the truth value true, false or unknown.