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 Current Order Date and Average Count of Orders for Three Prior Days Rate Topic Display Mode Topic Options
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 Posted Friday, October 05, 2007 8:14 PM
 SSC-Enthusiastic Group: General Forum Members Last Login: Wednesday, November 14, 2012 11:39 AM Points: 160, Visits: 476
 Want to get 1) the OrderDate and 2) the daily average of total Orders for that day and two previous days where there are orders. As an example, I use the Shipping.Orders Table from the Northwind database from SQL Server 2005. USE Northwind GO SELECT OrderDate, COUNT(OrderDate) FROM Shipping.Orders WHERE OrderDate Between '04-30-1998' AND '05-06-1998' GROUP BY OrderDate ORDER BY 1 DESC With this basic query you can see there are 4 orders on 5/6, 4 orders on 5/5 and 3 orders on 5/4. Total orders for the three day period is 11. Average of 3.67. Total orders for the next three day period starting from the next OrderDate is 10. Average of 3.33 So I would want the output to look like OrderDate AverageOrderCount 5/6 3.67 5/5 3.33 and so on... SELECT COUNT(OrderDate) FROM Shipping.Orders WHERE OrderDate Between '04-30-1998' AND '05-06-1998' ORDER BY 1 DESC
Post #407648
 Posted Friday, October 05, 2007 9:21 PM
 SSCarpal Tunnel Group: General Forum Members Last Login: Saturday, December 07, 2013 4:16 AM Points: 4,570, Visits: 8,299
 Total number of orders for the next 3 days is 7: 4 + 3 + 0. Can you explain your logic more precisely?
Post #407656
 Posted Friday, October 05, 2007 9:25 PM
 SSC-Enthusiastic Group: General Forum Members Last Login: Wednesday, November 14, 2012 11:39 AM Points: 160, Visits: 476
 I can try. Can you explain what "ext" means precisely?
Post #407657
 Posted Friday, October 05, 2007 9:37 PM
 SSCarpal Tunnel Group: General Forum Members Last Login: Saturday, December 07, 2013 4:16 AM Points: 4,570, Visits: 8,299
 I fixed the typo.
Post #407658
 Posted Friday, October 05, 2007 10:56 PM
 SSC-Enthusiastic Group: General Forum Members Last Login: Wednesday, November 14, 2012 11:39 AM Points: 160, Visits: 476
 Here's one solution but it is quite lengthy. I'm sure there is a more efficient answer. So please show me your wisdom! I used a different column though - RequiredDate instead of OrderDate. Here's the query to check the result set against. And below that - my inefficient, but working solution. --Check Table USE Northwind GO SELECT RequiredDate, COUNT(RequiredDate) FROM Shipping.Orders WHERE RequiredDate Between '1998-05-01' AND '1998-06-11' GROUP BY RequiredDate ORDER BY 1 DESC ------- Inefficient Solution -------- DECLARE @counter int, @counter2 int, @date smalldatetime, @scope int SELECT @counter = 1, @counter2 = 1 DECLARE @Time TABLE ( ID int IDENTITY (1,1), timex smalldatetime ) --Gather dates to report on -- Note: not all dates have a RequiredDate INSERT @Time (timex) SELECT DISTINCT RequiredDate FROM Shipping.Orders WHERE RequiredDate BETWEEN '1998-05-01' AND '1998-06-11' ORDER BY 1 DESC -- Select 1st Date SELECT @date = (SELECT timex FROM @Time WHERE ID = 1) -- Create Results table DECLARE @Results TABLE ( t_RequiredDate smalldatetime, t_count int ) SELECT @scope = SCOPE_IDENTITY() -- Set @scope to number of RequiredDates in @Time WHILE @counter < @scope BEGIN INSERT @Results SELECT timex, (SELECT COUNT(RequiredDate) FROM Shipping.Orders WHERE RequiredDate IN (SELECT distinct TOP 3 RequiredDate -- Only want count of last three RequiredDates FROM Shipping.Orders WHERE RequiredDate BETWEEN DATEADD(day, -10, @date) AND @date order by 1 desc) --Goes back 10 because not all dates have values ) FROM @Time WHERE ID = @counter2 SELECT @counter2 = @counter2 + 1 SELECT @date = (SELECT timex FROM @Time WHERE ID = @counter2) SELECT @counter = @counter + 1 END -- Retrieve Results SELECT t_RequiredDate, LTRIM(STR(CAST(t_count as float)/ 3, 4,2)) --obtain average FROM @Results ORDER BY 1 DESC
Post #407662
 Posted Friday, October 05, 2007 11:41 PM
 SSCarpal Tunnel Group: General Forum Members Last Login: Saturday, December 07, 2013 4:16 AM Points: 4,570, Visits: 8,299
 Still it's not clear what are trying to achieve. As for me the solution you posted is logically wrong. But I cannot be sure because I don't have an idea what's the task you need to solve.
Post #407668
 Posted Saturday, October 06, 2007 12:14 AM
 SSC-Enthusiastic Group: General Forum Members Last Login: Wednesday, November 14, 2012 11:39 AM Points: 160, Visits: 476
 Here's a shorter version, but I know there is still room for improvement. DECLARE @date smalldatetime, @counter int SELECT @date = '1998-06-11', @counter = 1 DECLARE @Results TABLE ( t_RequiredDate smalldatetime, t_count int ) -- Select @counter to desired result set size WHILE @counter < 10 BEGIN WHILE (SELECT DISTINCT RequiredDate FROM Shipping.Orders WHERE RequiredDate = @date) IS NULL BEGIN SELECT @date = DATEADD(day, -1, @date) END INSERT @Results SELECT RequiredDate, (SELECT COUNT(RequiredDate) FROM Shipping.Orders WHERE RequiredDate IN (SELECT distinct TOP 3 RequiredDate -- Only want count of last three RequiredDates FROM Shipping.Orders WHERE RequiredDate BETWEEN DATEADD(day, -10, @date) AND @date order by 1 desc) --Goes back 10 because not all dates have values ) FROM Shipping.Orders WHERE RequiredDate = @date SELECT @date = DATEADD(day, -1, @date) SELECT @counter = @counter + 1 END SELECT DISTINCT t_RequiredDate, LTRIM(STR(CAST(t_count as float)/ 3, 4,2)) --obtain average FROM @Results ORDER BY 1 DESC
Post #407672
 Posted Saturday, October 06, 2007 1:35 AM
 SSCarpal Tunnel Group: General Forum Members Last Login: Saturday, December 07, 2013 4:16 AM Points: 4,570, Visits: 8,299
 David, that was not much help. You cannot build any right query unless you know what you are querying for. I still see the same logical error (according to my understanding) in the approach, but I cannot tell for sure if it's an error in fact. Can you tell IN PLAIN ENGLISH WHAT ARE YOU LOOKING FOR? What does it really mean: the day and 2 earlier days? Which days to be taken as "earlier days"?
Post #407673
 Posted Saturday, October 06, 2007 12:19 PM
 SSCommitted Group: General Forum Members Last Login: Friday, December 06, 2013 12:33 PM Points: 1,564, Visits: 2,356
 It kind of seems to me David is looking for a rolling three day average. If today is the third day of the month, say 10/3, then he needs the average for 10/1+10/2+10/3. Tomorrow will be the fourth day of the month so he will need the average for 10/2+10/3+10/4, and so on. Greg_________________________________________________________________________________________________The glass is at one half capacity: nothing more, nothing less.
Post #407708
 Posted Saturday, October 06, 2007 1:30 PM
 SSCommitted Group: General Forum Members Last Login: Friday, December 06, 2013 12:33 PM Points: 1,564, Visits: 2,356
 David I do not have the sample databases, so I improvised. I think this may be what you are looking to do? I am fairly sure this is *not* the way you want to do this because it creates a triangular join, but it works. --Create test table and populate with data IF OBJECT_ID('tblOrders','u') IS NOT NULL DROP TABLE tblorders CREATE TABLE tblOrders ( ID INT IDENTITY(1,1), ORDER_DT SMALLDATETIME, ) INSERT INTO tblOrders (ORDER_DT) SELECT '10/5/2007' UNION ALL SELECT '10/5/2007' UNION ALL SELECT '10/5/2007' UNION ALL SELECT '10/5/2007' UNION ALL SELECT '10/4/2007' UNION ALL SELECT '10/4/2007' UNION ALL SELECT '10/4/2007' UNION ALL SELECT '10/3/2007' UNION ALL SELECT '10/2/2007' UNION ALL SELECT '10/2/2007' UNION ALL SELECT '10/2/2007' UNION ALL SELECT '10/1/2007' UNION ALL SELECT '10/3/2007' UNION ALL SELECT '10/6/2007' UNION ALL SELECT '10/6/2007' UNION ALL SELECT '10/6/2007' UNION ALL SELECT '10/6/2007' UNION ALL SELECT '10/6/2007' UNION ALL SELECT '10/6/2007' UNION ALL SELECT '10/6/2007' UNION ALL SELECT '10/3/2007' UNION ALL SELECT '10/2/2007' UNION ALL SELECT '10/1/2007' UNION ALL SELECT '10/6/2007' --Create temp table to hold total # orders per day IF OBJECT_ID('TempDB..#Temp','u') IS NOT NULL DROP TABLE #Temp CREATE TABLE #Temp ( ID INT IDENTITY(1,1), ORDER_DT SMALLDATETIME, DT_Total FLOAT, ) --Populate temp table INSERT INTO #Temp SELECT ORDER_DT, DT_Total = COUNT(order_dt) FROM tblOrders GROUP BY order_dt ORDER BY order_dt DESC --Find 3 day average SELECT t1.ORDER_DT, t1.DT_Total, ( SELECT ROUND(SUM(t2.dt_total)/3,1) FROM #temp t2 WHERE t2.order_dt = t1.order_dt OR t2.order_dt = t1.order_dt - 1 OR t2.order_dt = t1.order_dt -2 ) AS Total FROM #Temp t1 Greg_________________________________________________________________________________________________The glass is at one half capacity: nothing more, nothing less.
Post #407713

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