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 Help with Count over days (but not per day) ... the total up until that day through the date range. Rate Topic Display Mode Topic Options
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 Posted Sunday, September 30, 2012 8:06 AM
 Grasshopper Group: General Forum Members Last Login: Monday, October 17, 2016 4:51 PM Points: 20, Visits: 138
 I am having an issue trying to wrap my head around this.I am trying to get the count of something over the days in a date range, but I don't need a per day count, I need the count of items for each day through the date range... does that make sense?For example... the output should look something like this.Day1 - 12Day2 - 18Day3 - 24Day4 - 32Day5 - 80So, on Day1, there were 12 items. On Day2 there were 6 additional, so 12+6. On Day3 there were 6, so 12+6+6, Day4 there were 8, so 12+6+6+8, Day5 there were 48, so 12+6+6+8+48.I am sure there is a way, but I can't wrap my head around it.
Post #1366254
 Posted Sunday, September 30, 2012 11:51 PM
 Hall of Fame Group: General Forum Members Last Login: Wednesday, February 24, 2016 6:28 AM Points: 3,977, Visits: 6,431
 This article by Jeff Moden gives you arguably the best way to approach the running totals problem:http://www.sqlservercentral.com/articles/T-SQL/68467/ My mantra: No loops! No CURSORs! No RBAR! Hoo-uh!My thought question: Have you ever been told that your query runs too fast?My advice:INDEXing a poor-performing query is like putting sugar on cat food. Yeah, it probably tastes better but are you sure you want to eat it?The path of least resistance can be a slippery slope. Take care that fixing your fixes of fixes doesn't snowball and end up costing you more than fixing the root cause would have in the first place.Need to UNPIVOT? Why not CROSS APPLY VALUES instead?Since random numbers are too important to be left to chance, let's generate some!Learn to understand recursive CTEs by example.Splitting strings based on patterns can be fast!My temporal SQL musings: Calendar Tables, an Easter SQL, Time Slots and Self-maintaining, Contiguous Effective Dates in Temporal Tables
Post #1366323
 Posted Monday, October 1, 2012 2:48 AM
 Valued Member Group: General Forum Members Last Login: Tuesday, August 26, 2014 5:50 AM Points: 63, Visits: 293
 May be this query will help your problemCREATE TABLE #Temp (Name varchar(100), value int)INSERT INTO #Temp SELECT 'Day1', 12UNION SELECT 'Day2' ,6UNIONSELECT 'Day3' , 10UNION SELECT 'Day4' ,8UNIONSELECT 'Day5' ,4;with cte as(select *, ROW_NUMBER() over(PARTITION by null order by Name ) as IdFROM #Temp ) SELECT b.Name , SUM(A.value ), B.Id FROM cte AINNER JOIN cte B on A.Id <= B.Id GROUP BY B.Name , b.id
Post #1366396
 Posted Monday, October 1, 2012 2:52 AM
 Hall of Fame Group: General Forum Members Last Login: Wednesday, February 24, 2016 6:28 AM Points: 3,977, Visits: 6,431
 Sony Francis @EY (10/1/2012)May be this query will help your problemCREATE TABLE #Temp (Name varchar(100), value int)INSERT INTO #Temp SELECT 'Day1', 12UNION SELECT 'Day2' ,6UNIONSELECT 'Day3' , 10UNION SELECT 'Day4' ,8UNIONSELECT 'Day5' ,4;with cte as(select *, ROW_NUMBER() over(PARTITION by null order by Name ) as IdFROM #Temp ) SELECT b.Name , SUM(A.value ), B.Id FROM cte AINNER JOIN cte B on A.Id <= B.Id GROUP BY B.Name , b.idI believe Jeff talks about this "triangular join" in the article I referenced. My mantra: No loops! No CURSORs! No RBAR! Hoo-uh!My thought question: Have you ever been told that your query runs too fast?My advice:INDEXing a poor-performing query is like putting sugar on cat food. Yeah, it probably tastes better but are you sure you want to eat it?The path of least resistance can be a slippery slope. Take care that fixing your fixes of fixes doesn't snowball and end up costing you more than fixing the root cause would have in the first place.Need to UNPIVOT? Why not CROSS APPLY VALUES instead?Since random numbers are too important to be left to chance, let's generate some!Learn to understand recursive CTEs by example.Splitting strings based on patterns can be fast!My temporal SQL musings: Calendar Tables, an Easter SQL, Time Slots and Self-maintaining, Contiguous Effective Dates in Temporal Tables
Post #1366401
 Posted Monday, October 1, 2012 6:37 AM
 SSC-Enthusiastic Group: General Forum Members Last Login: Monday, November 21, 2016 8:21 AM Points: 149, Visits: 938
 I believe Jeff talks about this "triangular join" in the article I referenced.I don't think that its a triangular join - no subquery really.It looks like a moficifation of the CROSS JOIN method of running total computation.Instead of a filtered CROSS JOIN, the INNER JOIN condition is expanded.This is something that Jeff did not cover in his article as far as I can remember.This is my understanding; I'm open to correction.
Post #1366527
 Posted Monday, October 1, 2012 6:54 AM
 SSC-Forever Group: General Forum Members Last Login: Yesterday @ 3:23 PM Points: 42,036, Visits: 39,415
 diamondgm (10/1/2012)I believe Jeff talks about this "triangular join" in the article I referenced.I don't think that its a triangular join - no subquery really.It looks like a moficifation of the CROSS JOIN method of running total computation.Instead of a filtered CROSS JOIN, the INNER JOIN condition is expanded.This is something that Jeff did not cover in his article as far as I can remember.This is my understanding; I'm open to correction.You're correct. It's not a "triagular join". It's worse. It's a full accidental cross join. Look at the execution plan. You have 5 rows of data but one of the arrows coming off the table has 25 rows. If you add one more row to the data, that arrow jumps to 36, as expected with a cross join. --Jeff Moden"RBAR is pronounced "ree-bar" and is a "Modenism" for "Row-By-Agonizing-Row".First step towards the paradigm shift of writing Set Based code: Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column." Helpful Links:How to post code problemsHow to post performance problems
Post #1366538
 Posted Monday, October 1, 2012 9:15 AM
 Grasshopper Group: General Forum Members Last Login: Monday, October 17, 2016 4:51 PM Points: 20, Visits: 138
 Great thanks... now that I understand what I am looking for (the running total part), I see that there is a bunch of information out there.Thanks again.
Post #1366616

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