Question

为了在MS Access中生成销售数量的运行总计，我在下面的查询中使用了它，它按预期运行

SELECT ID, [Product Line], DSUM("[Qty]","[SalesData]","[Product Line] like '*Electronics*' AND [ID] <=" & [ID]) AS RunningTotal, FROM SalesData WHERE ([Product Line]) Like '*Electronics*';

现在，我需要使用RunningTotal <100过滤所有记录，我运行了以下子查询

SELECT * FROM( 
SELECT ID, [Product Line], DSUM("[Qty]","[SalesData]","[Product Line] like '*Electronics*' AND [ID] <=" & [ID]) AS RunningTotal, FROM SalesData WHERE ([Product Line]) Like '*Electronics*')
DSUM("[Qty]","[","[Product Line] like '*Electronics*' AND [ID] <=" & [ID]) < 100;

它不起作用，并且在运行该查询时表被冻结了很多次

数据表

ID    Product Line           Qty     RunningTotal
1     Electronics            15            15   
2     R.K. Electricals       20            20
3     Samsung Electronics    10            25
4     Electricals            30            50
5     Electricals            45            95
6     Electronics Components 18            43
7     Electricals            25           120
8     Electronics            50            93
9     Electricals Machines   65           185
10    Electronics            15           108
11    ABC Electronics Ltd    52           160
12    Electricals            15           200

此处 RunningTotal 是计算字段（不是表格字段）电子设备RunningTotal不同，电子设备RunningTotal不同

RunningTotal <100

的产品线 like Electronics 的预期输出

ID    Product Line           Qty     RunningTotal
1     Electronics            15            15   
3     Samsung Electronics    10            25
6     Electronics Components 18            43
8     Electronics            50            93

能帮我解决以上问题吗？

谢谢。

Answer 1

我不建议使用众所周知的缓慢的域聚合函数（例如DSum），而是建议使用相关的子查询，例如：

select q.* from
(
    select t.id, t.[product line], t.qty, 
        (
            select sum(u.qty) 
            from salesdata u 
            where u.[product line] = t.[product line] and u.id <= t.id
        ) as runningtotal
    from salesdata t
    where t.[product line] like "*Electronics*"
) q
where q.runningtotal < 100

编辑：

select t.*, q.runningtotal from salesdata t inner join
(
    select t.id, 
        (
            select sum(u.qty) 
            from salesdata u 
            where u.[product line] like "*Electronics*" and u.id <= t.id
        ) as runningtotal
    from salesdata t
) q on t.id = q.id
where q.runningtotal < 100 and t.[product line] like "*Electronics*"

MS Access-使用带有过滤器的DSUM的运行总计子查询

1 个答案: