Question

对于如何获得比所有商店的平均销售额都高的商店的销售额，我似乎找不到解决方案。

我已经尝试了一些方法并设法获得每个商店的平均销售额。然后，我试图使销售额大于所有商店平均水平但失败的商店。

SELECT SALES, (SELECT AVG(AVERSALES * SALES)) AS AVGSALES  FROM 
(
    SELECT           
        Shops.NAME, 
        SUM(InvDet.QTY * Products.PRICE ) AS SALES, 
        AVG(InvDet.QTY * Products.PRICE) AS AVERSALES
    FROM              
        Invoices 
        INNER JOIN InvDet ON Invoices.INV_ID = InvDet.INV_ID
        INNER JOIN Products ON InvDet.PR_ID = Products.PR_ID
        INNER JOIN Shops  ON Shops.S_ID=Invoices.S_ID
    WHERE 
    Invoices.INVOICE_DATE BETWEEN '2013-06-24' AND '2013-06-30'
    GROUP BY     Shops.NAME
)AS SALES_TABLE
GROUP BY SALES
HAVING  SALES > (SELECT AVG(AVERSALES))

Answer 1

您可以通过多种方式获得所需的信息。其中之一应该是这样：

select
  s.name,
  s.SALES
from (
  select 
    s.name,
    sum(i.QTY * p.PRICE) AS SALES
  from Invoices i 
    join InvDet id ON i.INV_ID = id.INV_ID
    join Products p ON id.PR_ID = p.PR_ID
    join Shops s ON s.S_ID=i.S_ID 
  where i.INVOICE_DATE BETWEEN '2013-06-24' AND '2013-06-30'
  group by s.name
  ) s
  join (
    select avg(i.QTY * p.PRICE) as average
    from Invoices i
      join InvDet id ON i.INV_ID = id.INV_ID
      join Products p ON id.PR_ID = p.PR_ID
    -- If you want to compare with the total average 
    -- remove this where part
    where i.INVOICE_DATE BETWEEN '2013-06-24' AND '2013-06-30'
  ) a
    on s.SALES>a.average

另一种方法（对我来说更清楚）必须返回相同的结果：

declare @average float

select @average=avg(i.QTY * p.PRICE)
from Invoices i
  join InvDet id ON i.INV_ID = id.INV_ID
  join Products p ON id.PR_ID = p.PR_ID
-- If you want to compare with the total average 
-- remove this where part
where i.INVOICE_DATE BETWEEN '2013-06-24' AND '2013-06-30'

select 
  s.name,
  sum(i.QTY * p.PRICE) AS SALES
from Invoices i 
  join InvDet id ON i.INV_ID = id.INV_ID
  join Products p ON id.PR_ID = p.PR_ID
  join Shops s ON s.S_ID=i.S_ID 
where i.INVOICE_DATE BETWEEN '2013-06-24' AND '2013-06-30'
group by s.name
having sum(i.QTY * p.PRICE)>@average

还有其他选择（例如，通用表表达式在这里也很合适）。我认为有了这两个就足以解决您的问题。我希望它们适合您的需求。

Answer 2

我不确定您的要求

SELECT SALES, (SELECT AVG(AVERSALES * SALES)) AS AVGSALES  FROM 
    (
        SELECT           
            Shops.NAME, 
            SUM(InvDet.QTY * Products.PRICE ) AS SALES, 
            AVG(InvDet.QTY * Products.PRICE) AS AVERSALES
        FROM              
            Invoices 
            INNER JOIN InvDet ON Invoices.INV_ID = InvDet.INV_ID
            INNER JOIN Products ON InvDet.PR_ID = Products.PR_ID
            INNER JOIN Shops  ON Shops.S_ID=Invoices.S_ID
        WHERE 
        Invoices.INVOICE_DATE BETWEEN '2013-06-24' AND '2013-06-30'
        GROUP BY     Shops.NAME
    )AS SALES_TABLE
    GROUP BY SALES
    HAVING  SALES > AVERSALES

我很难找到所有商店的平均销售额

2 个答案: