Sql 如果你在每次付款中减去折扣，那么它就会成倍增加。因此，如果您有两个1月份的条目，而不是一次应用两次折扣。正确的计算方法是什么？真奇怪！查询是否提取了正确的数据？例如，在6月份，如果不删除折扣，当我添加-o.mon\u order\u折扣时，我的总折扣为16

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如果你在每次付款中减去折扣，那么它就会成倍增加。因此，如果您有两个1月份的条目，而不是一次应用两次折扣。正确的计算方法是什么？真奇怪！查询是否提取了正确的数据？例如，在6月份，如果不删除折扣，当我添加

-o.mon\u order\u折扣时，我的总折扣为166594.92，它告诉我6月份现在是39024.47，相差127570.45，这是非常高的，而不是在接近折扣金额的地方应用的？？？@jasonangerton你能用表结构和示例数据创建一个新的折扣吗？这将更容易获得正确的查询。Ok将立即上载到sql FIDLE。哎呀！已被召集参加会议，将在我返回时上传到fiddle-感谢您迄今为止的所有帮助！嗯！在sqlfiddle中，它会产生正确的结果吗？需要查看数据@jasonangerton折扣应该应用于每笔付款还是整个月？这可能是造成问题的原因，如果你减去每笔付款的折扣，那么它就会成倍增加。因此，如果您有两个1月份的条目，而不是一次应用两次折扣。正确的计算方法是什么？
Table Name     ID              FK                  Columns
---------------------------------------------------------------------
tbl_orders     uid_orders                          mon_order_discount
tbl_payment    uid_payment     uid_pay_orderid     mon_pay_amount

Data:          Jan      Feb      March
Discounts:     10.00    20.00    10.00 
Payments:      200.00   300.00   400.00

Data:                Jan      Feb      March
Totals-Discount:     190.00   280.000  390.00 

SELECT *
FROM
  (SELECT 
      DATENAME(month, dte_pay_paydate) mth,
      mon_pay_amount
  FROM 
      tbl_payment
  INNER JOIN 
      dbo.tbl_orders ON (uid_pay_orderid = uid_orders)
  WHERE 
      bit_pay_paid = 1 
      AND txt_pay_descrip <> 'Credit' 
      AND uid_order_webid = 1
) x
PIVOT
(
  SUM(mon_pay_amount)
  FOR 
     mth IN ([January], [February], [March], [April], [May],
             [June], [July], [August], September, [October], 
             [November], [December])
) p

SELECT *
FROM
(
  SELECT 
      DATENAME(month, p.dte_pay_paydate) mth,
      p.mon_pay_amount - o.mon_order_discount as Total
  FROM tbl_payment p
  INNER JOIN tbl_orders o 
    ON p.uid_pay_orderid = o.uid_orders
  WHERE bit_pay_paid = 1 
      AND txt_pay_descrip <> 'Credit' 
      AND uid_order_webid = 1
) x
PIVOT
(
  SUM(Total)
  FOR 
     mth IN ([January], [February], [March], [April], [May],
             [June], [July], [August], September, [October], 
             [November], [December])
) p

SELECT *
FROM
(
  SELECT DATENAME(month, p.dte_pay_paydate) mth,
      sum(p.mon_pay_amount) - TotalDiscByMonth Total
  FROM tbl_payment p
  INNER JOIN tbl_orders o1
    on p.uid_pay_orderid = o1.uid_orders
  INNER JOIN
  (
    select sum(mon_order_discount) TotalDiscByMonth, DATENAME(month, dte_order_stamp) mth
    from tbl_orders
    group by DATENAME(month, dte_order_stamp)
  ) o2
    ON DATENAME(month, o1.dte_order_stamp) = o2.mth
  WHERE bit_pay_paid = 1 
      AND txt_pay_descrip <> 'Credit' 
  group by DATENAME(month, p.dte_pay_paydate), TotalDiscByMonth
) x
PIVOT
(
  SUM(Total)
  FOR 
     mth IN ([January], [February], [March], [April], [May],
             [June], [July], [August], September, [October], 
             [November], [December])
) p