SQL SERVER – CASE Statement in ORDER BY Clause – ORDER BY using Variable

Published on August 17 2015 by LakshmiSaahul,Dhana Royal

USE AdventureWorks
GO
DECLARE @OrderBy VARCHAR(10)
DECLARE @OrderByDirection VARCHAR(1)
SET @OrderBy = 'State' ----Other options Postal for PostalCode,
---- State for StateProvinceID, City for City
SET @OrderByDirection = 'D' ----Other options A for ascending,
---- D for descending
SELECT AddressID, City, StateProvinceID, PostalCode
FROM person.address
WHERE AddressID < 100
ORDER BY
CASE WHEN @OrderBy = 'Postal'
AND @OrderByDirection = 'D'
THEN PostalCode END DESC,
CASE WHEN @OrderBy = 'Postal'
AND @OrderByDirection != 'D'
THEN PostalCode END,
CASE WHEN @OrderBy = 'State'
AND @OrderByDirection = 'D'
THEN StateProvinceID END DESC,
CASE WHEN @OrderBy = 'State'
AND @OrderByDirection != 'D'
THEN StateProvinceID END,
CASE WHEN @OrderBy = 'City'
AND @OrderByDirection = 'D'
THEN City END DESC,
CASE WHEN @OrderBy = 'City'
AND @OrderByDirection != 'D'
THEN City END
GO

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