Need to find out the latest STATUS of each Consumers on a given date from their Activities

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Need to find out the latest STATUS of each Consumers on a given date from their Activities

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sql1411

Posted Friday, March 08, 2013 12:22 PM

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Hi there,

I've a ConsumerActivity table that records all the activities. Now, I need to find out the latest status for each Consumers on a given day.
For example, I need to write a query that gives me ConsumerID and latest Status on '2012-04-01 00:00:00'.
In this table, there is no activity on this date and as such I won't get any result. However, I want to get the result as:

ConsumerID Status
101 ACTIVE
102 PREMIUM

Below is my simple scenario and query:

USE [Sample]
GO
-- Create Table
CREATE TABLE [dbo].[ConsumerActivity](
[ConsumerID] [varchar](10) NOT NULL,
[ActivityDate] [datetime] NULL,
[Status] [varchar](10) NULL
) ON [PRIMARY]

GO

-- Insert Some Data into this table
GO
INSERT INTO dbo.ConsumerActivity (ConsumerID, ActivityDate, Status)

SELECT 101, '2012-01-10 00:00:00', 'INACTIVE'
UNION ALL
SELECT 101, '2012-05-20 00:00:00', 'ACTIVE'
UNION ALL
SELECT 102, '2012-02-10 00:00:00', 'BASE'
UNION ALL
SELECT 102, '2012-03-15 00:00:00', 'PREMIUM'

GO

Thanks.

Post #1428730

Sean Lange

Posted Friday, March 08, 2013 12:50 PM

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Last Login: Yesterday @ 2:34 PM
Points: 8,592, Visits: 8,233

Excellent job posting ddl, sample data and an explanation.

This should work based on your sample.

select * 
from
(
	select *, ROW_NUMBER() over (partition by ConsumerID order by ActivityDate desc) as RowNum
	from ConsumerActivity
) x 
where x.RowNum = 1

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Post #1428740

SQL_FS

Posted Friday, March 08, 2013 1:18 PM

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Last Login: Tuesday, March 12, 2013 5:11 PM
Points: 18, Visits: 115

I'm confused by your expected results.

You said you want to get the "latest status as of April 1, 2012." And state that you would expect ConsumerID 101 to be returned as "ACTIVE." Yet the dates in your sample data indicate that ConsumerID 101 is first inserted on January 10th, 2012 with an "INACTIVE" status, and the new status of "ACTIVE" is not inserted until May 20, 2012 (after your "as-of" report date). So I would have thought you would have expected ConsumerID 101 to be returned as "INACTIVE" based on your requirements.

Can you clarify on this point?

Post #1428750

Sean Lange

Posted Friday, March 08, 2013 1:36 PM

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Last Login: Yesterday @ 2:34 PM
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I guess I missed the bit about the date part. Just add a where clause to your query and you should be good to go.

declare @SearchDate datetime = '2012-04-01 00:00:00'

select * 
from
(
	select *, ROW_NUMBER() over (partition by ConsumerID order by ActivityDate desc) as RowNum
	from ConsumerActivity
	where ActivityDate < @SearchDate
) x 
where x.RowNum = 1

Post #1428758

sql1411

Posted Friday, March 08, 2013 1:37 PM

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Last Login: 2 days ago @ 4:41 PM
Points: 44, Visits: 77

@SQL_FS...... You got it right. Thanks for catching my mistake. Yes, for 101 the LatestStatus should be INACTIVE on April04,2012,

@Sean......thanks for your query. Your query can give me the LatestStatus. Sorry, if I confused you from my example as I pointed out by "SQL_FS". I want to know the LatestStatus for a member on a given date and I want to a parameter in this date so that the user can select any date and not just the latest date.

Let me know if I need to clarify further.

Thanks.

Post #1428759

sql1411

Posted Friday, March 08, 2013 1:40 PM

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Thanks Sean .....This should do it :)

Thanks again

Post #1428761

sql1411

Posted Friday, March 08, 2013 2:47 PM

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Hi Sean,

There seems to be a small problem I guess. The query seems to work for a April 04,2012. However, if I pick any ActivityDate as @SearchDate then it gives the previous status and not the status on that given date. For instance, if I set @SearchDate = '2012-05-20 00:00:00' , then for CustomerID 101 I get the Status as 'INACTIVE'.

Is there a way we can fix this??

Thanks

Post #1428773

sql1411

Posted Friday, March 08, 2013 2:51 PM

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Points: 44, Visits: 77

Never mind. I just had to add "<=" sign. :) Thanks again :)

Post #1428774

Sean Lange

Posted Friday, March 08, 2013 3:04 PM

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Last Login: Yesterday @ 2:34 PM
Points: 8,592, Visits: 8,233

sql1411 (3/8/2013)

Never mind. I just had to add "<=" sign. :) Thanks again :)

Glad you figured it out. This brings up a comment. If you store time information in your table you may want to modify your code slightly. Otherwise you will not the results you want if you pass in.

@SearchDate = '2012-05-20 11:11:00'

It really somewhat depends on what you want to do here. If you want to capture data from anytime on that day just modify the where clause a little to

where ActivityDate < dateadd(day, 1, @SearchDate)

Post #1428779

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