Introducing Common Table Expressions in SQL Server 2005 - Creating views from common table expressions
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In the previous section, we created a CTE based on a view. In this section, we shall create a view based on a CTE. Let us go through the following script:
create view Sales.vSales
as
With SalesPersonDetails(ID,[Name],Position,Quota,YearToDate,LastYear)
as
(
select SalesPersonID,(FirstName+MiddleName+LastName) as [Name],JobTitle,SalesQuota,SalesYTD,SalesLastYear
from Sales.vSalesPerson
)
select * from SalesPersonDetails
You can observe (from the above script) that creating a view involves just adding the "CREATE VIEW" syntax to an already existing/tested CTE.
All the examples in this article were tested using SQL Server 2005 Enterprise Edition. Please note that I didn't really test the examples on any other versions/editions or similar suites of Microsoft products (even though I believe that the examples will work on all SQL Server 2005 editions).
You also need to consider that the examples are not at all optimized for performance. Indeed, they should not be used in a real production environment. I just wanted to introduce the concept of CTEs through this article without any performance tuning (which is beyond the scope of this article).
My upcoming articles will go further in-depth on CTEs. So stay tuned!
Any comments, suggestions, ideas, improvements, bugs, errors, feedback etc. are highly appreciated at jag_chat@yahoo.com.
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