Question

我需要删除运行总计<100且[产品系列]包含“电子产品”的记录。

下面是表数据，这里 RunningTotal 不是表中的原始字段，它是子查询（内部查询）输出。

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

我使用以下查询过滤了[产品系列]包含“电子产品”且运行总计<100的记录。

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*"

我将匹配的记录（基于上述查询）复制到了另一个工作表中。复制后，我需要删除匹配的记录（<产品> [产品系列]包含“电子产品”并且运行总计<100 ）。我在下面的查询中写道，它引发错误无法从指定表中删除，并且无法正常工作

delete from (
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*")

非常感谢您的帮助。

Answer 1

您可以尝试：

delete from salesdata sd
    where sd2.[product line] like "*Electronics*" and
          (select sum(sd2.qty)
           from salesdata as sd2
           where sd2.[product line] like "*Electronics*" and
                 sd2.id < sd.id
          ) < 100;

Answer 2

在MS Access中，DELETE必须指定一个表而不是一个查询。假设您保存了SELECT查询（您应该为引擎编译最佳执行计划），请考虑一个带有子查询的EXISTS子句。

delete from salesdata s
where exists (select 1 from mysavedquery mq where s.id = mq.id)

MS Access-删除运行总数小于100的记录（子查询输出）

2 个答案: