Need to create a Scalar Valued Function

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Need to create a Scalar Valued Function

sql1411

Ten Centuries

Points: 1390
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February 28, 2013 at 11:05 am

#394282

Hi ,
I need to write a Scalar-valued function ( I guess) to get the highest status for each member on a given day if there are more than one status entered for that particular member on that particular day.
Below is the very simple scenario:
-- 1. Create Agent Status History
GO
CREATE TABLE [dbo].[AgentStatusHistory](
[AgentID] [int] NOT NULL,
[QualifyDate] [datetime] NULL,
[Status] [varchar] (10)
) ON [PRIMARY]
GO
-- 2. INSERT some data into AgentStatusHistory table
GO
INSERT INTO dbo.AgentStatusHistory (AgentID, QualifyDate, Status)
SELECT 101, '2010-02-01 00:00:00', 'LOW'
UNION ALL
SELECT 101, '2011-05-01 00:00:00', 'MEDIUM'
UNION ALL
SELECT 101, '2011-05-01 00:00:00', 'HIGH'
UNION ALL
SELECT 102, '2012-22-25 00:00:00', 'LOW'
UNION ALL
SELECT 102, '2012-22-25 00:00:00', 'MEDIUM'
UNION ALL
SELECT 102, '2012-22-25 00:00:00', 'HIGH'
GO
From the above example, if I execute the below SQL query..
SELECT * FROM dbo.AgentStatusHistory
ORDER BY AgentID, QualifyDate;
here is what I need to see in the result set…
•AgentID, QualifyDate, Status
•101, '2010-05-01 00:00:00', 'HIGH'
•101, '201-02-01 00:00:00', 'LOW'
•102, '2012-22-25 00:00:00', 'HIGH'

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Lowell SSC Guru Points: 323518 More actions · Answer 1

Great job on supplying the DDL and Sample data;

probably a copy paste error, but two of the dates have the month "22", so i couldn't get it loaded all teh way.

offhand, i'd think that this will get you what you are asking, without using a function:

SELECT * FROM (

SELECT ROW_NUMBER() OVER(PARTITION BY AgentID,QualifyDate

ORDER BY CASE

WHEN Status='LOW'

THEN 1

WHEN Status='MEDIUM'

THEN 2

WHEN Status='HIGH'

THEN 3

ELSE 0

END DESC ) AS RW,

* FROM AgentStatusHistory) MyAlias WHERE RW=1

Lowell

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sql1411 Ten Centuries Points: 1390 More actions · Answer 2

Hi Lowell,

Thanks for your response. This is what I needed. However, is it possible to embed this logic to create a scalar valued function so that I can use these AgentIDs for lot of other different purposes??

Thanks again.

Sean Lange SSC Guru Points: 286590 More actions · Answer 3

sql1411 (2/28/2013)
Hi Lowell,
Thanks for your response. This is what I needed. However, is it possible to embed this logic to create a scalar valued function so that I can use these AgentIDs for lot of other different purposes??
Thanks again.

You think you want a scalar function but I think you will find the performance is far from acceptable. Given the simplicity of this you should instead create it as a view, or an iTVF (inline table valued function) if it needs parameters. The performance will be far superior and it is easier to use.

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sql1411 Ten Centuries Points: 1390 More actions · Answer 4

Thanks for the suggestion. I never thought about that 🙂