Altering Precedence
Precedence is altered by grouping characters as follows:
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Within parentheses, expansion or execution of operations is resolved before other expansions regardless of operator precedence.
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Within parentheses, precedence of operators is maintained during evaluation of expressions.
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Within parentheses, expansion operators are not applied to expressions unless the operators are also within the parentheses.
See Also: “Grouping Characters” in Special Characters in Oracle Text Queries