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  SQL Server Tips by Gama and Naughter

 

Allow parameterized filtering with the IN clause
 

Example: Create a SP that will return rows from table Shippers filtering by ShipperID. Any combination of ShipperID should be possible by means of using the IN clause with its filter data as an input parameter of the SP.

 

CREATE PROCEDURE spOrdersByShipperID @Shippers varchar(20)

--returns the orders by any combination of shipper ID's

AS

EXEC('SELECT dbo.Orders.OrderID, dbo.Orders.ShipName, dbo.Orders.ShipCity, dbo.Orders.ShipRegion, dbo.Orders.ShipPostalCode, dbo.Orders.ShipCountry,

               dbo.Shippers.CompanyName

FROM  dbo.Orders INNER JOIN

               dbo.Shippers ON dbo.Orders.ShipVia = dbo.Shippers.ShipperID

WHERE (dbo.Shippers.ShipperID IN ('+@Shippers+'))')
 


The above book excerpt is from:

Super SQL Server Systems
Turbocharge Database Performance with C++ External Procedures

ISBN: 0-9761573-2-2
Joseph Gama, P. J. Naughter

 http://www.rampant-books.com/book_2005_2_sql_server_external_procedures.htm
 

 

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