Capturing Historical/past data from Current data in tables

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Capturing Historical/past data from Current data in tables

thomasrichardson2000

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Points: 808
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October 16, 2012 at 9:04 am

#265780

Below is some sample ddl and data. Each row represents an item that is on rent between a period of time. If I run the query as of now it gives me all the rentals in there current state as of today ,I want to be able to see what rentals were actually active/on rent on a particular day in the past e.g yesterday, 2 days ago, 3 days ago etc. I am finding it difficult to do this as I am looking at the data as of today, the rental could be closed(off-rent) today but active yesterday, How do I capture historical data? There is more columns in the table, I posted the below as I thought date columns would be most relevant, All ideas are welcome and any help is greatly appreciated.
IF OBJECT_ID('TempDB..#mytable','U') IS NOT NULL DROP TABLE #mytable
CREATE TABLE #mytable
( NUMBER INT PRIMARY KEY CLUSTERED,
CLOSE_DATE datetime,
Date_out datetime,
Date_in datetime
)
INSERT INTO #mytable (Number, CLOSE_DATE, Date_out, Date_in)
SELECT '1004','15/10/2012','28/09/2012','15/10/2012' UNION ALL
SELECT '1005','15/10/2012','12/09/2012','15/10/2012' UNION ALL
SELECT '1006','14/10/2012','17/06/2012','14/10/2012' UNION ALL
SELECT '1007','14/10/2012','17/08/2012','12/10/2012' UNION ALL
SELECT '1008','14/10/2012','17/05/2012','11/10/2012' UNION ALL
SELECT '1009','14/10/2012','01/06/2012','14/10/2012' UNION ALL
SELECT '1010','13/10/2012','17/03/2012','10/10/2012' UNION ALL
SELECT '1011','14/07/2012','01/07/2012','13/07/2012' UNION ALL
SELECT '1012','21/09/2012','17/09/2012','24/09/2012' UNION ALL
SELECT '1013','03/08/2012','21/06/2012','03/08/2012' UNION ALL
SELECT '1014','04/09/2012','17/08/2012','04/09/2012'
SELECT Number,Close_Date,Date_Out , Date_In
FROM #mytable

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Sean Lange SSC Guru Points: 286590 More actions · Answer 1

Thanks for the ddl and sample data.

Something like this?

declare @TargetDate datetime = dateadd(dd, datediff(dd, 0, getdate()) - 2, 0) --this will get a date 2 days ago

select @TargetDate

select * from #mytable

where Date_out <= @TargetDate and Date_in >= @TargetDate

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Sean Lange SSC Guru Points: 286590 More actions · Answer 2

Actually that probably would not get items that are not yet returned. You probably need something like this to accommodate a NULL in Date_in.