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WHERE (Transact-SQL)

 

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

Specifies the search condition for the rows returned by the query.

Topic link icon Transact-SQL Syntax Conventions

-- Syntax for SQL Server, Azure SQL Database, Azure SQL Data Warehouse, Parallel Data Warehouse  
  
[ WHERE <search_condition> ]  

< search_condition >
Defines the condition to be met for the rows to be returned. There is no limit to the number of predicates that can be included in a search condition. For more information about search conditions and predicates, see Search Condition (Transact-SQL).

The following examples show how to use some common search conditions in the WHERE clause.

A. Finding a row by using a simple equality

USE AdventureWorks2012  
GO  
SELECT ProductID, Name  
FROM Production.Product  
WHERE Name = 'Blade' ;  
GO  

B. Finding rows that contain a value as a part of a string

SELECT ProductID, Name, Color  
FROM Production.Product  
WHERE Name LIKE ('%Frame%');  
GO  

C. Finding rows by using a comparison operator

SELECT ProductID, Name  
FROM Production.Product  
WHERE ProductID <= 12 ;  
GO  

D. Finding rows that meet any of three conditions

SELECT ProductID, Name  
FROM Production.Product  
WHERE ProductID = 2  
OR ProductID = 4   
OR Name = 'Spokes' ;  
GO  

E. Finding rows that must meet several conditions

SELECT ProductID, Name, Color  
FROM Production.Product  
WHERE Name LIKE ('%Frame%')  
AND Name LIKE ('HL%')  
AND Color = 'Red' ;  
GO  

F. Finding rows that are in a list of values

SELECT ProductID, Name, Color  
FROM Production.Product  
WHERE Name IN ('Blade', 'Crown Race', 'Spokes');  
GO  

G. Finding rows that have a value between two values

SELECT ProductID, Name, Color  
FROM Production.Product  
WHERE ProductID BETWEEN 725 AND 734;  
GO  

The following examples show how to use some common search conditions in the WHERE clause.

H. Finding a row by using a simple equality

-- Uses AdventureWorks  
  
SELECT EmployeeKey, LastName  
FROM DimEmployee  
WHERE LastName = 'Smith' ;  

I. Finding rows that contain a value as part of a string

-- Uses AdventureWorks  
  
SELECT EmployeeKey, LastName  
FROM DimEmployee  
WHERE LastName LIKE ('%Smi%');  

J. Finding rows by using a comparison operator

-- Uses AdventureWorks  
  
SELECT EmployeeKey, LastName  
FROM DimEmployee  
WHERE EmployeeKey  <= 500;  

K. Finding rows that meet any of three conditions

-- Uses AdventureWorks  
  
SELECT EmployeeKey, LastName  
FROM DimEmployee  
WHERE EmployeeKey = 1 OR EmployeeKey = 8 OR EmployeeKey = 12;  

L. Finding rows that must meet several conditions

-- Uses AdventureWorks  
  
SELECT EmployeeKey, LastName  
FROM DimEmployee  
WHERE EmployeeKey <= 500 AND LastName LIKE '%Smi%' AND FirstName LIKE '%A%';  

M. Finding rows that are in a list of values

-- Uses AdventureWorks  
  
SELECT EmployeeKey, LastName  
FROM DimEmployee  
WHERE LastName IN ('Smith', 'Godfrey', 'Johnson');  

N. Finding rows that have a value between two values

-- Uses AdventureWorks  
  
SELECT EmployeeKey, LastName  
FROM DimEmployee  
WHERE EmployeeKey Between 100 AND 200;  

DELETE (Transact-SQL)
Predicates (Transact-SQL)
Search Condition (Transact-SQL)
SELECT (Transact-SQL)
UPDATE (Transact-SQL)
MERGE (Transact-SQL)

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