Question

我有Users的表格，其中包含培训预算

ID | UserID | FName | SName | Dept | Budget
 1 |   1    | John  | Smith |  CS  |  1000
 2 |   2    | Ian   | Caine |  CS  |  2500
 3 |   3    | Jane  | Kelly |  ED  |  1000
 4 |   1    | John  | Smith |  EQ  |  1000
 5 |   2    | Ian   | Caine |  EQ  |  2500
 6 |   3    | Jane  | Kelly |  CS  |  1000

然后我有另一张表Courses来存储他们所采取的课程;

ID | UserID | Course | Date    | Dept |Cost  
1  |   1    |  CS01  | 1/4/18  | CS   | 100
2  |   2    |  CS01  | 1/4/18  | CS   | 100
3  |   1    |  CS02  | 10/4/18 | CS   | 75
4  |   2    |  CS02  | 10/4/18 | CS   | 75
5  |   1    |  CS01  | 1/4/18  | EQ   | 100

我想在顶部创建一个包含User信息的表单，在底部创建一个Courses的子表单，例如

UserID | FName | SName | Dept | Budget
  1    | John  | Smith |  CS  |  1000

subfrm    
Course | Date    | Cost | Balance Remaining  
 CS01  | 1/4/18  | 100  | 900
 CS02  | 10/4/18 | 75   | 825

[更新]我坚持使用子窗体的基础查询，以下是我正在玩的SQL;

SELECT USerID, Amount,

  (SELECT Sum(tbl_Courses.Cost) AS Total

  FROM tbl_Courses

  WHERE tbl_Courses.ID <= t1.ID) AS Total

FROM tbl_Courses AS T1

但是这给了我一个完整的运行总计而不是UserID和Dept的运行总计。

Answer 1

只需将条件添加到子查询的WHERE子句并加入用户表以检索预算值，即可将查询与所需的分组相关联。

SELECT u.UserID, c.Date, c.Cost, 
       u.Budget -
                 (SELECT Sum(sub.Cost)
                  FROM tbl_Courses sub
                  WHERE sub.ID <= c.ID
                    AND sub.UserID = c.UserID
                    AND sub.Dept = c.Dept) AS [Budget Remaining]
FROM tbl_Users u
INNER JOIN tbl_Courses AS c
   ON u.UserID = c.UserID AND u.Dept = c.Dept

对于可更新的查询，请使用域聚合DSum：

SELECT u.UserID, c.Date, c.Cost, 
       u.Budget -
       DSum("sub.Cost", "tbl_Courses", "ID <= " & c.ID & 
                                       " AND UserID = " & c.UserID &  
                                       " AND Dept = '" & c.Dept & "'") AS [Budget Remaining]
FROM tbl_Users u
INNER JOIN tbl_Courses AS c
   ON u.UserID = c.UserID AND u.Dept = c.Dept

减少预算

1 个答案: