Nesting
Nesting is the method of combining Boolean operators in a logical order when more than one Boolean operator is used in a statement. Parentheses are used to effectively sequence the operators and group variables. The parentheses offer substantial control in limiting and ordering the relationship between the variables.
Note: Complex nesting requires additional
processing time.
When writing a nested Boolean logic statement using the operator OR, you must enclose the terms in parentheses. For example:
(Gas or Propane) and (08 or 10)