boolean_expression

Is any valid expression that returns TRUE, FALSE, or UNKNOWN.

The following table shows the result of the OR operator.

Boolean

OR returns TRUE when either of the conditions is TRUE.

The following example uses the vEmployeeDepartmentHistory view to retrieve the names of Quality Assurance personnel who work either the evening shift or the night shift. If the parentheses are omitted, the query returns Quality Assurance employees who work the evening shift and all employees who work the night shift.

USE AdventureWorks
GO
SELECT FirstName, LastName, Shift 
FROM HumanResources.vEmployeeDepartmentHistory
WHERE Department = 'Quality Assurance'
   AND (Shift = 'Evening' OR Shift = 'Night')

Here is the result set.

FirstName    LastName         Shift
------------ ---------------- -------
Andreas      Berglund         Evening
Sootha       Charncherngkha   Night

Reference

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