[英]Complete datediff calculation based on MAX and MIN values
Sorry I did post a question similar earlier, but I was not that clear.抱歉,我之前确实发布过类似的问题,但我不是很清楚。 I have a table with the fields, Customer, ID_Date, Pstng_Date, SUMOfAmount, Days_BetweenMax and days_between Min.
我有一个包含字段的表,客户,ID_Date,Pstng_Date,SUMOfAmount,Days_BetweenMax 和 days_between Min。
What I want is a query that shows me the date difference between the pstng_date and the ID_Date where the pstng_date is the max value for that customer and another column that shows the same calculation where the pstng_date is the minimum value for that customer.我想要的是一个查询,它显示 pstng_date 和 ID_Date 之间的日期差异,其中 pstng_date 是该客户的最大值,另一列显示相同的计算,其中 pstng_date 是该客户的最小值。 Those customers with only one Pstng_date should display as zero
那些只有一个 Pstng_date 的客户应该显示为零
So the Query should display the results like this:所以查询应该显示这样的结果:
Customer ID_Date Pstng_Date SumOfAmount Days_BetweenMAX days_betweenMIN
-------- ---------- ---------- ----------- ------------
Holmes 31/01/2014 10/01/2014 $21,545.59 0 0
James 31/01/2014 10/01/2014 -$21,197.89 0 21
James 31/01/2014 5/01/2014 -$7,823.14 0 0
James 31/01/2014 24/01/2014 $308.00 7 0
Rod 31/01/2014 17/01/2014 -$2,603.95 0 0
Lisa 31/01/2014 17/01/2014 $22,019.49 0 0
Assuming that your existing table is called [Postings], you could create a query to calculate the MIN() and MAX() values of [Pstng_Date]假设您现有的表名为 [Postings],您可以创建一个查询来计算 [Pstng_Date] 的 MIN() 和 MAX() 值
SELECT
Customer,
MIN(Pstng_Date) AS MinOfPstng_Date,
MAX(Pstng_Date) AS MaxOfPstng_Date
FROM Postings
GROUP BY Customer
returning回来
Customer MinOfPstng_Date MaxOfPstng_Date
-------- --------------- ---------------
Holmes 2014-01-10 2014-01-10
James 2014-01-05 2014-01-24
Lisa 2014-01-17 2014-01-17
Rod 2014-01-17 2014-01-17
Then you could use that as a subquery in the query to calculate the date differences然后您可以将其用作查询中的子查询来计算日期差异
SELECT
p.Customer,
p.ID_Date,
p.Pstng_Date,
p.SumOfAmount,
IIf(q.MaxOfPstng_Date=q.MinOfPstng_Date,0,IIf(p.Pstng_Date=q.MaxOfPstng_Date,DateDiff("d",p.Pstng_Date,p.ID_Date),0)) AS Days_BetweenMAX,
IIf(q.MaxOfPstng_Date=q.MinOfPstng_Date,0,IIf(p.Pstng_Date=q.MinOfPstng_Date,DateDiff("d",p.Pstng_Date,p.ID_Date),0)) AS Days_BetweenMIN
FROM
Postings AS p
INNER JOIN
(
SELECT
Customer,
MIN(Pstng_Date) AS MinOfPstng_Date,
MAX(Pstng_Date) AS MaxOfPstng_Date
FROM Postings
GROUP BY Customer
) AS q
ON p.Customer = q.Customer
returning回来
Customer ID_Date Pstng_Date SumOfAmount Days_BetweenMAX Days_BetweenMIN
-------- ---------- ---------- ----------- --------------- ---------------
Holmes 2014-01-31 2014-01-10 21545.59 0 0
James 2014-01-31 2014-01-10 -21197.89 0 0
James 2014-01-31 2014-01-05 -7823.14 0 26
James 2014-01-31 2014-01-24 308.00 7 0
Rod 2014-01-31 2014-01-17 -2603.95 0 0
Lisa 2014-01-31 2014-01-17 22019.49 0 0
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