Selecting a value based on where parameter falls within a range of dates

Attached is a sample of  2 DRG Codes and their effective dates and two patients who have one of the 2 DRG codes.

I want to assign them their CostWeightRiw based on the DRG code and the when their DischargeDate is greater then or equal to one of the EffectiveDates and less than the next Later Date.

So in the example Patient A0000251483 has a DRG of 183 and a DischargeDate of 4/3/2010.  So the CostWeightRiw would be the one for Effectivedate 10/1/2009, 1.4432.

What is the syntax to write a SQL query for the two tables DRG and DATA?

Glen
DRG_Table.xlsx
GPSPOWAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

TONY TAYLORCommented:
SELECT DATA.*, DRG2.CostWeightRiw 
FROM
	DATA 
	OUTER APPLY (
		SELECT TOP 1 DRG.CostWeightRiw 
		FROM DRG 
		WHERE DRG.CodeID = DATA.DRG AND DATA.DischargeDate >= DRG.EffectiveDateTime 
		ORDER BY DRG.EffectiveDateTime DESC 
	) DRG2

Open in new window

0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
GPSPOWAuthor Commented:
Thanks

With a little tweaking I was able to adapt it for multiple fields.

Glen
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft SQL Server 2008

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.