Access 查询中的返回值

Question

我需要有关 Access 中的查询的帮助。 我需要返回截至今天为止的过去 14 天内拥有三个或更多订单且仍处于活动状态的客户名称。 它还应该在结果中显示订购日期。 这将填充在报告中并按“cusname”分组并显示每个“orderdate”。 我尝试使用查询向导并输入下面的 sql 但它没有填充任何结果。 有人可以帮忙吗？

Select customerid, count(*), cusname,orderdate,orderstatus
From tablename
Where orderstatus="active"
Group by customerid,cusname,orderdate,orderstatus
Having Count(*) >=3;

桌子：

CusName:|orderdate:
Mary     4/4/2021
Mary     4/3/2021
Mary     4/8/2021
Mary     3/23/2021
Bob      4/9/2021
Bob      4/1/2021

我期望的结果是：

桌子：

Customerid:|CusName:|orderdate:
1 Mary     4/4/2021
1 Mary     4/3/2021
1 Mary     4/8/2021

Answer 1

这在 MS Access 中相当棘手，但您可以使用：

select t.*
from tablename as t
where t.orderstatus = "active" and
      t.orderdate in (select top 3 t2.orderdate
                      from tablename t2
                      where t2.customerid = t.customerid and
                            t2.orderstatus = "active" and
                            t2.orderdate > dateadd("day", -14, date())
                      order by t2.orderdate desc
                     ) and
      3 <= (select count(*)
            from tablename as t3
            where t3.customerid = t.customerid and
                  t3.orderstatus = "active" and
                  t3.orderdate > dateadd("day", -14, date())
           );

第一个子查询获取每个客户最近的三行。 第二个检查至少有三个。

Answer 2

1. 你也应该把过滤器放在日期上
2. 如果您要计算“每个客户的唯一订单”而不是“每个客户每个日期的唯一订单”，您可能不应该按订单日期分组

SELECT customer_id, cusname, COUNT(*) 
  FROM <tablename> 
 WHERE ABS(DateDiff('d', order_date, NOW())) <= 14 -- check order date
   AND order_status = 'active'                     -- check order status
 GROUP BY customer_id, cusname                     -- group by customer, not by order
HAVING COUNT(*) >= 3                               -- filter customers with 3+ orders

Answer 3

尝试这个

SELECT t.customerid,
       t.cusname,
       t.orderdate,
       t.orderstatus
FROM   tablename AS t
WHERE  t.orderstatus = "active"
       AND t.orderdate > Dateadd("d", -14, DATE())
       AND (SELECT Count(t1.cusname)
            FROM   tablename AS t1
            WHERE  t.customerid = t1.customerid
                   AND t1.orderstatus = "active"
                   AND t1.orderdate > Dateadd("d", -14, DATE())) >= 3