Add parentheses in expressions containing more than one identifier or literal

Always use parentheses in expressions containing more than one identifier or literal. This clarifies code for inexperienced developers who are not familiar with operator precedence.

Original SQL:

IF nSSN < 2.5 THEN
   <statements>
END IF;

Formatted SQL:

IF (nSSN < 2.5) THEN
    <statements>
END IF;

Links:

http://www.dba-oracle.com/t_plsql_code_alignment_standards.htm