OR (Transact-SQL)

บทความ
09/03/2024

Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW) SQL analytics endpoint in Microsoft Fabric Warehouse in Microsoft Fabric

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.

Transact-SQL syntax conventions

Syntax

boolean_expression OR boolean_expression

Arguments

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

Result Types

Boolean

Result Value

OR returns TRUE when either of the conditions is TRUE.

Remarks

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

Examples

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's the result set.

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

Examples: Azure Synapse Analytics and Analytics Platform System (PDW)

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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