OR (Transact-SQL)

OR (Transact-SQL)

 

THIS TOPIC APPLIES TO: yesSQL Server (starting with 2008) yesAzure SQL Database yesAzure SQL Data Warehouse yesParallel Data Warehouse

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
-- Azure SQL Data Warehouse and Parallel Data Warehouse
      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.

-- Uses AdventureWorks

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

The following example retrieves the names of employees who either earn a BaseRate less than 20 or have a HireDate January 1, 2001 or later.

-- Uses AdventureWorks

SELECT FirstName, LastName, BaseRate, HireDate 
FROM DimEmployee
WHERE BaseRate < 10 OR HireDate >= '2001-01-01';

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