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OR (Transact-SQL)

Updated: 14 April 2006

Combines two conditions. When more than one logical operator is used in a statement, OR operators are evaluated after AND operators. However, you can change the order of evaluation by using parentheses.

Topic link icon Transact-SQL Syntax Conventions


boolean_expression OR boolean_expression
boolean_expression

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

The following table shows the result of the OR operator.

  TRUE FALSE UNKNOWN

TRUE

TRUE

TRUE

TRUE

FALSE

TRUE

FALSE

UNKNOWN

UNKNOWN

TRUE

UNKNOWN

UNKNOWN

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

Release History

14 April 2006

Changed content:
  • Replaced the example.
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