连续行之间的日期差异

Question

我有一个表，结构如下

ID     Account Number     Date
1      1001               10/9/2011 (dd/mm/yyyy)
2      2001               1/9/2011 (dd/mm/yyyy)
3      2001               3/9/2011 (dd/mm/yyyy)
4      1001               12/9/2011 (dd/mm/yyyy)
5      3001               18/9/2011 (dd/mm/yyyy)
6      1001               20/9/2011 (dd/mm/yyyy)

基本上我想做的是有一个access查询，它计算连续记录的日期差异，但对于相同的账号，预期的结果将是!！

1001      10/9/2011 - 12/9/2011     2 days
1001      12/9/2011 - 20/9/2011     8 days
1001      20/9/2011                 NA

基本上，我想做的是有一个access查询，它计算连续记录的日期差异，但对于相同的账号，在上面的例子中将是1001。(日期不必显示在结果中)

我使用access 2003。

Answer 1

SELECT  T1.ID, 
        T1.AccountNumber, 
        T1.Date, 
        MIN(T2.Date) AS Date2, 
        DATEDIFF("D", T1.Date, MIN(T2.Date)) AS DaysDiff
FROM    YourTable T1
        LEFT JOIN YourTable T2
            ON T1.AccountNumber = T2.Accountnumber
            AND T2.Date > T1.Date
GROUP BY T1.ID, T1.AccountNumber, T1.Date;

或

SELECT  ID,
        AccountNumber,
        Date,
        NextDate,
        DATEDIFF("D", Date, NextDate)
FROM    (   SELECT  ID, 
                    AccountNumber,
                    Date,
                    (   SELECT  MIN(Date) 
                        FROM    YourTable T2
                        WHERE   T2.Accountnumber = T1.AccountNumber
                        AND     T2.Date > T1.Date
                    ) AS NextDate
            FROM    YourTable T1
        ) AS T

Answer 2

您还可以使用LAG分析函数来获得所需的结果，如下所示：

假设下面是您的输入表：

id  account_number  account_date
1     1001          9/10/2011
2     2001          9/1/2011
3     2001          9/3/2011
4     1001          9/12/2011
5     3001          9/18/2011
6     1001          9/20/2011


select id,account_number,account_date,
datediff(day,lag(account_date,1) over (partition by account_number order by account_date asc),account_date)
as day_diffrence
from yourtable;

以下是您的输出：

id  account_number  account_date    day_diffrence
1     1001           9/10/2011    NULL
4     1001           9/12/2011    2
6     1001           9/20/2011    8
2     2001           9/1/2011     NULL
3     2001           9/3/2011     2
5     3001           9/18/2011    NULL

Answer 3

如果需要，您可以为帐号添加WHERE语句。您的表名为t4

SELECT 
   t4.ID, 
   t4.AccountNumber, 
   t4.AcDate, 
   (SELECT TOP 1 AcDate 
    FROM t4 b 
    WHERE b.AccountNumber=t4.AccountNumber And b.AcDate>t4.AcDate 
    ORDER BY AcDate DESC, ID) AS NextDate, 
   [NextDate]-[AcDate] AS Diff
FROM t4
ORDER BY t4.AcDate;