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OR (Transact-SQL)

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.

OR returns TRUE when either of the conditions is TRUE.

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

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 AdventureWorks2012;
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

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