## Calculate EndDate From Subsequent StartDate

 Author Message Nilssond SSCommitted Group: General Forum Members Points: 1889 Visits: 556 Here is sample data I am working with:Create table cattimelines (categoryID int, EffectiveDate datetime, CategoryValue varchar(11))INSERT INTO cattimelines(categoryID, EffectiveDate, CategoryValue) VALUES(1000, '2014-01-01', 'A')INSERT INTO cattimelines(categoryID, EffectiveDate, CategoryValue) VALUES(1000, '2014-02-01', 'B')INSERT INTO cattimelines(categoryID, EffectiveDate, CategoryValue) VALUES(1000, '2014-04-01', 'C')INSERT INTO cattimelines(categoryID, EffectiveDate, CategoryValue) VALUES(1000, '2014-07-01', 'A')I need to calculates a term date for each record which will be 1 day before the effective date of any new record, thus:CATEGORYID EFFECTIVEDATE TERMDATE CATEGORYVALUE1000 2014-01-01 2014-01-31 A1000 2014-02-01 2014-03-21 B1000 2014-04-01 2014-06-30 C1000 2014-07-01 NULL A Evil Kraig F SSC Guru Group: General Forum Members Points: 53015 Visits: 7660 Does this data only work with dates, and never times (such as what GETDATE() would return?). The reason I ask is that it basically skips a day worth of minutes between, say, 6/30/14 00:00:00.003 and 6/30/14 23:59:59.957.However, if you're simply doing this for reporting purposes and not detection logic, the easiest way is to dual query the information (you have to do this), and find the minimum date for your key greater than the current row's value. This is most easily done with Outer Apply:`IF OBJECT_ID ('tempdb..#cattimelines') IS NOT NULL DROP TABLE #cattimelinesCreate table #cattimelines (categoryID int, EffectiveDate datetime, CategoryValue varchar(11))INSERT INTO #cattimelines(categoryID, EffectiveDate, CategoryValue) VALUES(1000, '2014-01-01', 'A')INSERT INTO #cattimelines(categoryID, EffectiveDate, CategoryValue) VALUES(1000, '2014-02-01', 'B')INSERT INTO #cattimelines(categoryID, EffectiveDate, CategoryValue) VALUES(1000, '2014-04-01', 'C')INSERT INTO #cattimelines(categoryID, EffectiveDate, CategoryValue) VALUES(1000, '2014-07-01', 'A')SELECT ct.CategoryID, EffectiveDate AS StartDate, DATEADD( dd, -1, drv.MinED) AS EndDate, CategoryValueFROM #cattimelines AS ct OUTER APPLY (SELECT ct2.CategoryID, MIN( ct2.EffectiveDate) AS MinED FROM #cattimelines AS ct2 WHERE ct.EffectiveDate < ct2.EffectiveDate AND ct.CategoryID = ct2.CategoryID GROUP BY ct2.CategoryID ) AS drv` - Craig FarrellNever stop learning, even if it hurts. Ego bruises are practically mandatory as you learn unless you've never risked enough to make a mistake. For better assistance in answering your questions | Forum NetiquetteFor index/tuning help, follow these directions. |Tally TablesTwitter: @AnyWayDBA LinksUp Hall of Fame Group: General Forum Members Points: 3167 Visits: 4946 Since you posted in an SQL 2012 forum, you could look at LAG & LEAD.A non 2012 solution to this would be something like this:`;with cte as( Select categoryID, effectivedate, categoryvalue, ROW_NUMBER() over(order by categoryID, effectiveDate) as RowNum from cattimelines)select c.categoryID, c.effectivedate, DATEADD(dd, -1, n.effectivedate) termDate from cte as c left outer join cte as n on c.categoryID = n.categoryID and c.RowNum = N.RowNum-1` __________________________________________________________________________________________________________How to Post to get the most: http://www.sqlservercentral.com/articles/Best+Practices/61537/ Luis Cazares SSC Guru Group: General Forum Members Points: 96360 Visits: 21215 To give the example of LEAD() as proposed by LinksUp.`SELECT categoryID, EffectiveDate AS StartDate, DATEADD( dd, -1, LEAD(EffectiveDate) OVER( PARTITION BY categoryID ORDER BY EffectiveDate) ) AS EndDate, CategoryValueFROM cattimelines` Luis C.General Disclaimer:Are you seriously taking the advice and code from someone from the internet without testing it? Do you at least understand it? Or can it easily kill your server?How to post data/code on a forum to get the best help: Option 1 / Option 2

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