[英]Complete datediff calculation based on MAX and MIN values
抱歉,我之前确实发布过类似的问题,但我不是很清楚。 我有一个包含字段的表,客户,ID_Date,Pstng_Date,SUMOfAmount,Days_BetweenMax 和 days_between Min。
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。 那些只有一个 Pstng_date 的客户应该显示为零
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
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
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
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
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
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.