In expressions, field names are always enclosed by parentheses.

Name: In expressions, field names are always enclosed by parentheses.
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Quizplus · Accepted Answer

Field names are not always enclosed by parentheses in expressions. They can be used without parentheses in certain cases, such as when they are the only item in the expression or when they are being used as a parameter to a function. However, it is generally considered good practice to enclose field names in parentheses for the sake of clarity and consistency.

In Expressions, Field Names Are Always Enclosed by Parentheses