Sql 如何仅从主选择中可用的数据进行嵌套选择拉取

我正在SSRS report Builder 2016中创建报告

我有一组数据，其中包含一组机构以及每个机构每月的账单金额。对于TotalBilled，每个代理都可以有多个值。我想找到每个机构的总账单价值中位数

我在查询中计算中值，但它从所有代理中的所有TotalBilled中提取，而不仅仅是我在参数中设置的与代理相关的TotalBilled

以下是我的数据集查询：

DECLARE @Cnt int = (SELECT COUNT(TotalBilled) FROM InvoiceLine)

select 
     a.AgencyID
     a.startdate,
     a.enddate,
     [TotalBilled],

     ((SELECT TOP 1 TotalBilled
     FROM   (
         SELECT  TOP (@Cnt/2) TotalBilled
         FROM    InvoiceLine I
         WHERE   TotalBilled is NOT NULL
         ORDER BY TotalBilled ASC
         ) AS I
     ORDER BY TotalBilled DESC) +
     (
     SELECT TOP 1 TotalBilled
     FROM   (
         SELECT  TOP (@Cnt/2) TotalBilled
         FROM    InvoiceLine I
         WHERE   TotalBilled is NOT NULL
         ORDER BY TotalBilled DESC
         ) AS I
     ORDER BY TotalBilled ASC)) / 2 AS MedianTotalBilled

from Agency a
left join invoiceLine invl
    on a.InvoiceID = invl.InvoiceID
where (a.agencyid in (@agency))
and (a.startdate >= @startdate and a.enddate <= @enddate)

更改meidan值计算的正确方法是什么，使其受参数的影响，而不仅仅是从整个数据库中提取

编辑：

此外，将连接添加到中值计算中也不会产生中值的预期值。以下是我目前正在尝试的：

(SELECT TOP 1 TotalBilled
     FROM   (
         SELECT  TOP (@Cnt/2) TotalBilled
         left join invoiceLine invl
              on a.InvoiceID = invl.InvoiceID
         where (a.agencyid in (@agency))
         and (a.startdate >= @startdate and a.enddate <= @enddate)
         and  TotalBilled is NOT NULL
         ORDER BY TotalBilled ASC
     ) AS I
 ORDER BY TotalBilled DESC)

---

我相信您希望将行限制添加到子选择中，如下所示

DECLARE @Cnt int = (SELECT COUNT(TotalBilled) FROM InvoiceLine)
    select 
         a.AgencyID
         a.startdate,
         a.enddate,
         [TotalBilled],

         ((SELECT TOP 1 TotalBilled
         FROM   (
             SELECT  TOP (@Cnt/2) TotalBilled
             FROM    InvoiceLine I
             WHERE   TotalBilled is NOT NULL
             and  a.InvoiceID = I.InvoiceID --new
             ORDER BY TotalBilled
             ) AS I
         ORDER BY TotalBilled DESC) +
         (
         SELECT TOP 1 TotalBilled
         FROM   (
             SELECT  TOP (@Cnt/2) TotalBilled
             FROM    InvoiceLine I
             WHERE   TotalBilled is NOT NULL
             and  a.InvoiceID = I.InvoiceID --new
             ORDER BY TotalBilled DESC
             ) AS I
         ORDER BY TotalBilled ASC)) / 2 AS MedianTotalBilled

    from Agency a
    left join invoiceLine invl
        on a.InvoiceID = invl.InvoiceID
    where (a.agencyid in (@agency))
    and (a.startdate >= @startdate and a.enddate <= @enddate)

编辑： 行计数的选择器也需要限制

select 
     a.AgencyID
     a.startdate,
     a.enddate,
     [TotalBilled],



    ((SELECT TOP 1 TotalBilled
     FROM   (
         SELECT  TOP (
             (
                SELECT  count(*)
                FROM    InvoiceLine I
                WHERE   TotalBilled is NOT NULL
                and  a.InvoiceID = I.InvoiceID 
             )


             /2) TotalBilled
         FROM    InvoiceLine I
         WHERE   TotalBilled is NOT NULL
         and  a.InvoiceID = I.InvoiceID --new
         ORDER BY TotalBilled
         ) AS I
     ORDER BY TotalBilled DESC)

from Agency a
left join invoiceLine invl
    on a.InvoiceID = invl.InvoiceID
where (a.agencyid in (@agency))
and (a.startdate >= @startdate and a.enddate <= @enddate)

---

在两个子选项中添加a和a.InvoiceID=l.InvoiceID不是您想要的吗？谢谢，我不确定如何正确地将该连接添加到选项中。但它看起来确实应该起作用。好的，这看起来不错。TotalBilled的计数是否正确，或者我需要更改如何计算此总数？声明@Cnt int=SELECT COUNTTotalBilled FROM InvoiceLine需要更改为每行的子选择谢谢您的帮助！这对我来说是无价的！