将新输入的行与另一个列值相乘，然后在SQL中找到总和

Question

我这里有4个表，我需要将一个表中新输入的行值与另一行相乘，并使用来找到总和CustomerId：

客户表 ：

CustomerId Name   EmailId
-------------------------
1          Paul   [e-mail]
2          John   [e-mail]

LoyaltyPointTable ：

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

此查询对每个项目的总和都适用 LoyaltyType

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

以下RedeemPointsTable是与以下行的兑换相关的 LoyaltyPointTable：

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

我所期待计算总和之前，我想柱Amount和(100+50+10+60) * 1在Redeeming在LoyaltyPointTable与每个总分加入CustomerId

预期产量

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Amount他输入的RedeemPointsTable

我应该在添加外键列时进行更改RedeemPointsTable吗？还是可以指出我的错误？

任何帮助将是巨大的。

Answer 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

你可以在这里检查