CASE expression in a Query in SQL Server

You can use the CASE expression in a T-SQL query in SQL Server to get the same behavior of the switch statement in the programming languages.

Below is a sample Query demonstrating the implementation of the CASE expression in a query in SQL Server.

CASE expression in a Query in SQL Server

use AdventureWorks2014
GO
SELECT Name, GroupName,     
CASE GroupName      
WHEN 'Research and Development' THEN 'United States of America'      
WHEN 'Quality Assurance' THEN 'United Kingdom'          
ELSE 'India'     
END AS Country  
FROM HumanResources.Department

The query associates a Department group name to a country USA and UK for Research and Development and Quality Assurance. For other departments , it associates the country India.