May 30, 2010

A Simple example of a Conditional Where Clause in SQL Server

I was recently preparing a query for a report where the client needed to find out the following information from a small table -

- Products that have been Discontinued but are receiving Orders

- Products that have not been Discontinued but do not generate Orders

I solved this requirement using Conditional WHERE Clause. The Products table of the Northwind database has fields that match this requirement and I will demonstrate the Conditional WHERE clause query using the same. Here’s the query:

SELECT ProductID, ProductName, UnitsOnOrder, Discontinued from
Products WHERE
(Discontinued = 1 AND UnitsOnOrder > 0)
Discontinued = 0 AND UnitsOnOrder = 0)



You can also branch the statements and re-write the query using an IF-ELSE statement, however since this was a small table, I went in for the Conditional WHERE clause.

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Suprotim Agarwal, ASP.NET Architecture MVP works as an Architect Consultant and provides consultancy on how to design and develop Web applications.

Suprotim is also the founder and primary contributor to DevCurry, DotNetCurry and SQLServerCurry. He has also written an EBook 51 Recipes using jQuery with ASP.NET Controls.

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