2.4.8 Logical Operators

Logical operators define the relationship between two adjacent condition expressions, when multiple expressions are specified.

Logical operators that can be used in condition expressions are listed in the following table.

Logical operator	Logical operation	Explanation
AND	AND operation	Links pairs of condition expressions with the AND operator Evaluates to TRUE if the results of both condition expressions is TRUE Evaluates to FALSE if either or both condition expressions are FALSE
OR	OR operation	Links pairs of condition expressions with the OR operator Evaluates to TRUE if either or both condition expressions are TRUE Evaluates to FALSE if both condition expressions are FALSE

Logical operator

Logical operation

Explanation

AND

AND operation

Links pairs of condition expressions with the AND operator

Evaluates to TRUE if the results of both condition expressions is TRUE

Evaluates to FALSE if either or both condition expressions are FALSE

OR operation

Links pairs of condition expressions with the OR operator

Evaluates to TRUE if either or both condition expressions are TRUE

Evaluates to FALSE if both condition expressions are FALSE

Point

The AND operator is evaluated first in condition expressions that contains both AND and OR operators.
Use parentheses "()" to change the order of logical operators' evaluation. In the following example, (condition_expression_2 OR condition_expression_3) is evaluated first.
```
condition_expression_1 AND (condition_expression_2 OR condition_expression_3)
```

Note

Lower-case "and" and "or" cannot be used as logical operators.