Question

我创建了一个包含两个表的数据库：Table1和Table2。

Table1包含以下数据：

Account#    Account Owner
1           Person1
2           Person2

Table2包含：

Account#      Date Modified     Status
1             5/15/2011         Open
2             4/15/2011         Closed
1             5/21/2011         Pending
2             6/15/2011         Cancelled

使用SQL，如何合并这两个表，以便它为我提供每个帐户的最新状态？

Answer 1

这样做：

SELECT Table1.[Account#],
       Table1.[Account Owner],
       L.LastOfDate,
       Table2.Status
FROM   ((SELECT Table2.[Account#],
                Max(Table2.[Date Modified]) AS LastOfDate
        FROM   Table2
        GROUP  BY Table2.[Account#]) AS L
        INNER JOIN Table1
          ON L.[Account#]=Table1.[Account#])
       INNER JOIN Table2
         ON (L.[Account#]=Table2.[Account#])
            AND (L.LastOfDate=Table2.[Date Modified]);

将导致：

Account#    Account Owner    LastOfDate     Status
1           Person1          05/21/2011     Pending
2           Person2          06/15/2011     Cancelled

使用MS-Access合并表

1 个答案: