Sql ms access的窗口功能_Sql_Ms Access_Partition By

Sql ms access的窗口功能

sql ms-access

Sql ms access的窗口功能,sql,ms-access,partition-by,Sql,Ms Access,Partition By,我正在MS Access中开发一个课程调度数据库。有各种各样的课程，每一门课都要教多次，有时一天教多次，但不一定每天都教。每门课程都有一套独特的软件和数据存储在笔记本电脑上。每门课程都有一套笔记本电脑，装有该软件对于任何给定的培训日，我需要为不同教室的正确课程分配一系列笔记本电脑ID，具体取决于该教室将有多少人参加该课程，以便教员知道当天带哪些笔记本电脑到教室授课例如，我有原始数据： Date Room ClassName HeadCount ---- ---- -

我正在MS Access中开发一个课程调度数据库。有各种各样的课程，每一门课都要教多次，有时一天教多次，但不一定每天都教。每门课程都有一套独特的软件和数据存储在笔记本电脑上。每门课程都有一套笔记本电脑，装有该软件

对于任何给定的培训日，我需要为不同教室的正确课程分配一系列笔记本电脑ID，具体取决于该教室将有多少人参加该课程，以便教员知道当天带哪些笔记本电脑到教室授课

例如，我有原始数据：

Date   Room   ClassName      HeadCount
----   ----   ---------      ---------
11/30   101   Intro            10
11/30   102   Intro            15
11/30   103   Course 2          5
12/1    101   Intro            10
12/1    102   Course 2         15
12/1    103   Course 3         10

关于笔记本电脑，我也知道以下几点：

ClassName    LaptopID
---------   ---------
Intro       LT.Intro_1
Intro        ...
Intro       LT.Intro_30
Course 2    LT.Course 2_1
Course 2      ...
Course 2    LT.Course 2_30
Course 3    LT.Course 3_1   
Course 3    ...
Course 3    LT.Course 3_30

基于以上两个表，我想输出：

Date   Room   ClassName     HeadCount  First Laptop   Last Laptop
----   ----   ---------     ---------  ------------   -----------
11/30   101   Intro           10       LT.Intro_1     LT.Intro_10
11/30   102   Intro           15       LT.Intro_11    LT.Intro_25
11/30   103   Course 2         5       LT.Course 2_1  LT.Course 2_5
12/1    101   Intro           10       LT.Intro_1     LT.Intro_10
12/1    102   Course 2        15       LT.Course 2_1  LT.Course 2_15
12/1    103   Course 3        10       LT.Course 3_1  LT.Course 3_10

我知道这是一个窗口功能，但MS Access没有超前或滞后。是否有解决方法？

您可能需要更改表定义以获得更好的性能。正如你提到的，我已经重新创建了两个表

你知道你的笔记本电脑ID是按顺序排列的，你知道每个班级的人数。为了跟踪线索，你必须知道最后的人数。这将是在当前课程/活动之前，在同一日期，针对同一课程的所有与会者

x=总人数，其中id 现在您知道了当前行之前使用的笔记本电脑总数和当前行的员工总数。第一台笔记本电脑将是

f = min(laptopid) where laptopid > x (x being totaLaptopUsedBefore this Row)

对于最后一台笔记本电脑，您还必须添加当前的员工人数

l = min(laptopid) where laptopid >= currentHeadCount + x

注f检查LaptoId大于L检查>=

这是一个可以改进的工作演示：

表1：tbl_类事件

+----+------------+------+-----------+-----------+
| ID |    date    | Room | ClassName | HeadCount |
+----+------------+------+-----------+-----------+
|  1 | 30/11/2017 |  101 | Intro     |        10 |
|  2 | 30/11/2017 |  102 | intro     |        15 |
|  3 | 30/11/2017 |  103 | Course 2  |         5 |
|  4 | 01/12/2017 |  101 | Intro     |        10 |
|  5 | 01/12/2017 |  102 | Course 2  |        15 |
|  6 | 01/12/2017 |  103 | Course 3  |        10 |
|  7 | 17/11/2017 |  101 | Intro     |        16 |
+----+------------+------+-----------+-----------+

Table2: Tbl_ClassVsLaptop
+----+-----------+----------------+
| Id | ClassName |    LaptopId    |
+----+-----------+----------------+
|  1 | Intro     | LT.Intro_1     |
|  2 | Intro     | LT.Intro_2     |
|  3 | Intro     | LT.Intro_3     |
|  4 | Intro     | LT.Intro_4     |
|  5 | Intro     | LT.Intro_5     |
|  6 | Intro     | LT.Intro_6     |
|  7 | Intro     | LT.Intro_7     |
|  8 | Intro     | LT.Intro_8     |
|  9 | Intro     | LT.Intro_9     |
| 10 | Intro     | LT.Intro_10    |
| 11 | Intro     | LT.Intro_11    |
| 12 | Intro     | LT.Intro_12    |
| 13 | Intro     | LT.Intro_13    |
| 14 | Intro     | LT.Intro_14    |
| 15 | Intro     | LT.Intro_15    |
| 16 | Intro     | LT.Intro_16    |
| 17 | Intro     | LT.Intro_17    |
| 18 | Intro     | LT.Intro_18    |
| 19 | Intro     | LT.Intro_19    |
| 20 | Intro     | LT.Intro_20    |
| 21 | Intro     | LT.Intro_21    |
| 22 | Intro     | LT.Intro_22    |
| 23 | Intro     | LT.Intro_23    |
| 24 | Intro     | LT.Intro_24    |
| 25 | Intro     | LT.Intro_25    |
| 26 | Intro     | LT.Intro_26    |
| 27 | Intro     | LT.Intro_27    |
| 28 | Intro     | LT.Intro_28    |
| 29 | Intro     | LT.Intro_29    |
| 30 | Intro     | LT.Intro_30    |
| 31 | Course 2  | LT.Course 2_1  |
| 32 | Course 2  | LT.Course 2_2  |
| 33 | Course 2  | LT.Course 2_3  |
| 34 | Course 2  | LT.Course 2_4  |
| 35 | Course 2  | LT.Course 2_5  |
| 36 | Course 2  | LT.Course 2_6  |
| 37 | Course 2  | LT.Course 2_7  |
| 38 | Course 2  | LT.Course 2_8  |
| 39 | Course 2  | LT.Course 2_9  |
| 40 | Course 2  | LT.Course 2_10 |
| 41 | Course 2  | LT.Course 2_11 |
| 42 | Course 2  | LT.Course 2_12 |
| 43 | Course 2  | LT.Course 2_13 |
| 44 | Course 2  | LT.Course 2_14 |
| 45 | Course 2  | LT.Course 2_15 |
| 46 | Course 2  | LT.Course 2_16 |
| 47 | Course 2  | LT.Course 2_17 |
| 48 | Course 2  | LT.Course 2_18 |
| 49 | Course 2  | LT.Course 2_19 |
| 50 | Course 2  | LT.Course 2_20 |
| 51 | Course 2  | LT.Course 2_21 |
| 52 | Course 2  | LT.Course 2_22 |
| 53 | Course 2  | LT.Course 2_23 |
| 54 | Course 2  | LT.Course 2_24 |
| 55 | Course 2  | LT.Course 2_25 |
| 56 | Course 2  | LT.Course 2_26 |
| 57 | Course 2  | LT.Course 2_27 |
| 58 | Course 2  | LT.Course 2_28 |
| 59 | Course 2  | LT.Course 2_29 |
| 60 | Course 2  | LT.Course 2_30 |
| 61 | Course 3  | LT.Course 3_1  |
| 62 | Course 3  | LT.Course 3_2  |
| 63 | Course 3  | LT.Course 3_3  |
| 64 | Course 3  | LT.Course 3_4  |
| 65 | Course 3  | LT.Course 3_5  |
| 66 | Course 3  | LT.Course 3_6  |
| 67 | Course 3  | LT.Course 3_7  |
| 68 | Course 3  | LT.Course 3_8  |
| 69 | Course 3  | LT.Course 3_9  |
| 70 | Course 3  | LT.Course 3_10 |
| 71 | Course 3  | LT.Course 3_11 |
| 72 | Course 3  | LT.Course 3_12 |
| 73 | Course 3  | LT.Course 3_13 |
| 74 | Course 3  | LT.Course 3_14 |
| 75 | Course 3  | LT.Course 3_15 |
| 76 | Course 3  | LT.Course 3_16 |
| 77 | Course 3  | LT.Course 3_17 |
| 78 | Course 3  | LT.Course 3_18 |
| 79 | Course 3  | LT.Course 3_19 |
| 80 | Course 3  | LT.Course 3_20 |
| 81 | Course 3  | LT.Course 3_21 |
| 82 | Course 3  | LT.Course 3_22 |
| 83 | Course 3  | LT.Course 3_23 |
| 84 | Course 3  | LT.Course 3_24 |
| 85 | Course 3  | LT.Course 3_25 |
| 86 | Course 3  | LT.Course 3_26 |
| 87 | Course 3  | LT.Course 3_27 |
| 88 | Course 3  | LT.Course 3_28 |
| 89 | Course 3  | LT.Course 3_29 |
| 90 | Course 3  | LT.Course 3_30 |
+----+-----------+----------------+

以下是查询：

SELECT tbl_classEvents.ID
    ,tbl_classEvents.DATE
    ,tbl_classEvents.Room
    ,tbl_classEvents.ClassName
    ,tbl_classEvents.HeadCount
    ,(
        SELECT min(laptopId)
        FROM tbl_ClassVsLaptop T1
        WHERE T1.ClassName = tbl_ClassEvents.ClassNAme
            AND Mid([T1.LaptopID], InStrRev([T1.LaptopID], "_") + 1, 3) > (
                + Nz((
                        SELECT sum(headCount)
                        FROM tbl_classEvents T2
                        WHERE T2.ID < Tbl_ClassEvents.ID
                            AND T2.[DATE] = [Tbl_ClassEvents].[DATE]
                            AND T2.[ClassName] = [Tbl_ClassEvents].[ClassName]
                        ), 0)
                )
        ) AS FirstLaptop
    ,(
        SELECT min(laptopId)
        FROM tbl_ClassVsLaptop T1
        WHERE T1.ClassName = tbl_ClassEvents.ClassNAme
            AND Mid([T1.LaptopID], InStrRev([T1.LaptopID], "_") + 1, 3) >= (
                + [tbl_classEvents].[HeadCount] + Nz((
                        SELECT sum(headCount)
                        FROM tbl_classEvents T2
                        WHERE T2.ID < Tbl_ClassEvents.ID
                            AND T2.[DATE] = [Tbl_ClassEvents].[DATE]
                            AND T2.[ClassName] = [Tbl_ClassEvents].[ClassName]
                        ), 0)
                )
        ) AS LastLaptop
FROM tbl_classEvents
ORDER BY tbl_classEvents.DATE
    ,tbl_classEvents.Room
    ,tbl_classEvents.ClassNAme;