将新输入的行与另一列值相乘，并在 SQL 中找到 Total Sum答案

【问题标题】：Multiply newly entered row with another column value and find Total Sum in SQL将新输入的行与另一列值相乘，并在 SQL 中找到 Total Sum
【发布时间】：2015-01-28 08:11:19
【问题描述】：

我这里有 4 个表格，我需要将表格中新输入的行值与另一行相乘，然后使用 CustomerId 找到总和：

客户表：

CustomerId Name   EmailId
-------------------------
1          Paul   r@r.com
2          John   J@j.com

忠诚度积分表：

LoyaltyPointsId LoyaltyType     Points
---------------------------------------
1               Registration       10
2               Loginstatus         1
3               Downloading        10
4               Redemming           1
5               Sharing            20
6               Refer              10

忠诚度详情表：

 LoyaltyDetailsId LoyaltyPointsId CustomerId Dates
 -------------------------------------------------
  1                    1            1       2015-01-22 
  2                    2            1       2015-01-22 
  3                    3            2       2015-01-22
  4                    3            1       2015-01-22 
  5                    4            1       2015-01-22
  6                    4            1       2015-01-24 
  7                    5            1       2015-01-24

此查询适用于每个LoyaltyType 的总和

SELECT   
   LoayaltyPointsTable.LoyaltyType,
   COUNT(CustomerTable.CustomerId) AS UserActions,
   SUM(LoayaltyPointsTable.Points) AS TotalPoints 
FROM 
   LoayaltyPointsTable 
JOIN 
   LoyaltyDetailsTable ON LoayaltyPointsTable.LoyaltyPointsId = LoyaltyDetailsTable.LoyaltyPointsId
JOIN
   CustomerTable ON CustomerTable.CustomerId = LoyaltyDetailsTable.CustomerId 
WHERE
   CustomerTable.CustomerId = 1
GROUP BY
   LoyaltyDetailsTable.CustomerId ,LoayaltyPointsTable.LoyaltyType

在RedeemPointsTable 下方创建与LoyaltyPointTable 中的行兑换相关：

兑换积分表：

 RedeemPointsId CustomerId ShopName BillNo Amount
 ------------------------------------------------
 1                   1      Mall x  4757    100
 3                   1      Mall y  SH43    50
 4                   1      Mall x  7743    10
 6                   1      Mall x  s34a    60

我的期望是在计算总和之前，我希望将 LoyaltyPointTable 中的 Redeeming 中的 Amount 和 (100+50+10+60) * 1 列与每个 CustomerId 的总分相加

预期输出

LoyaltyType UserActions TotalPoints
-------------------------------------
Downloading     1        10
Loginstatus     1         1
Redemming       4   (100+50+10+60)*1(here using Amount in RedeemPointsTable)
Refer           1        10
Registration    1        10
Sharing         1        20

用户操作计数为 4，它基于他在RedeemPointsTable 中输入的Amount

在RedeemPointsTable中添加外键列是否需要进行更改，或者您能指出我的错误吗？

任何帮助都会很棒。

【问题讨论】：

标签： sql sql-server sum multiplication

【解决方案1】：

这是返回所需结果的查询：

SELECT 
   LoyaltyPointTable.LoyaltyType, 
   CASE 
      WHEN LoyaltyPointTable.LoyaltyPointsId=4 THEN (SELECT COUNT(amount) FROM RedeemPointsTable where CustomerId=1) 
      ELSE COUNT(CustomerTable.CustomerId) 
   END as UserActions, 
   CASE 
      WHEN LoyaltyPointTable.LoyaltyPointsId=4 THEN (SELECT SUM(amount) FROM RedeemPointsTable where CustomerId=1)*Points
      ELSE SUM(LoyaltyPointTable.Points) 
    END as TotalPoints
FROM 
   LoyaltyPointTable 
JOIN 
   LoyaltyDetailsTable ON LoyaltyPointTable.LoyaltyPointsId =     LoyaltyDetailsTable.LoyaltyPointsId
JOIN
   CustomerTable ON CustomerTable.CustomerId = LoyaltyDetailsTable.CustomerId 
WHERE
   CustomerTable.CustomerId = 1
GROUP BY
   LoyaltyDetailsTable.CustomerId ,LoyaltyPointTable.LoyaltyType

您可以查看here

【讨论】：

非常感谢您的回答，我收到此错误“列 'LoayaltyPoints_T.LoyaltyPointsId' 在选择列表中无效，因为它不包含在聚合函数或 GROUP BY 子句中。 ' ，所以我只是在 group by 中添加了 LoayaltyPoints_T.LoyaltyPointsId,LoayaltyPoints_T.Points 并且它可以工作，我有疑问可以优化查询还是需要任何新列进行更多优化？
嗨，你能回答this吗，我正在用你以前的查询做这个sql。