Question

select 
a.ClientID,
f.Currency,
a.OrganizationName,
COALESCE(sum(b.GrandTotal),0) as SaleGrandTotal,
COALESCE(sum(g.AmountReceived),0) as AmountReceived,
COALESCE(sum(b.GrandTotal - g.AmountReceived),0) as SaleBalanceRemaining, 
COALESCE(sum(d.GrandTotal), 0) as PurchaseGrandTotal, 
COALESCE(sum(e.AmountPaid), 0) as AmountPaid,
COALESCE(sum(d.GrandTotal - e.AmountPaid),0) as PurchaseBalanceRemaining,
COALESCE(sum(b.GrandTotal - g.AmountReceived),0) - COALESCE(sum(d.GrandTotal - e.AmountPaid),0) as Total 
from na_clients as a
join na_currency as f 

left join na_transaction as b
on a.ClientID = b.ClientID and b.CurrencyID = f.CurrencyID and b.IsActive = 1

left join na_recoverylogs as g
on b.TID = g.TID

left join na_purchase as d 
on a.ClientID = d.ClientID and d.CurrencyID = f.CurrencyID  and d.IsActive = 1

left join na_purchaselogs as e
on e.PID = d.PID

group by a.OrganizationName,f.Currency
order by a.OrganizationName

我使用多种货币，如美元，人民币，卢比。它工作正常，但今天我注意到sum（）双值像b.GrandTotal应该是11500但它的返回23000

Table Client:
clientid,name,organizationName
1,client1,OrgName
2,client2,OrgName

Table Currency:
currencyid,cname
1,Dollar
2,Rupees

Table Transaction:
tid,clientid,currencyid,grandTotal,amountReceived,balanceremaining
1,1,1,11000,0,11000
2,1,1,500,0,500

Table recoveryLogs: // Another Error Here
id,tid,amountreceived
1,1,0
2,2,0
3,2,2000     // Again sum() multiply value - because of PID 2 is repeating


Table Purchase:
pid,clientid,currencyid,grandTotal,amountPaid,balanceRemaining
1,1,1,25000,0,25000
1,2,2,2,3000,1000,2000
Now I am using sum(b.grandTotal) instead of 11500 it return 23000

Table PurchaseLogs: // Another Error Here
id,pid,amountpaid
1,1,0
2,2,1000
3,1,1000            // Again sum() multiply value - because of PID 1 is repeating

结果应该是：

Client: Client1
SaleGrandTotal: 11500
AmountReceived: 0
SaleBalanceRemaining: 11500
PurchaseGrandTotal: 25000
AmountPaid: 0
PurchaseBalanceRemaining: 25000
Total Amount: -13500

但结果我得到了：

    Client: Client1
    SaleGrandTotal: 23000
    AmountReceived: 0
    SaleBalanceRemaining: 23000
    PurchaseGrandTotal: 50000
    AmountPaid: 0
    PurchaseBalanceRemaining: 50000
    Total Amount: -27000

如果我从查询中删除购买条款（d和e）或交易（b和g）条款，它可以单独运作。

Answer 1

数据加倍的原因是您的index在“交易”和“购买”表格中出现的次数不同，因此不是一对一的匹配。 ClientID和ClientID = 1在交易中出现两次，在购买时出现一次。当您加入表时，会产生1 x 2 = 2 CurrencyID = 1个记录的组合，其中一些字段会重复数据。因此，对于重复输入，求和将加倍。如图所示：

ClientID

考虑使用派生表分隔两个表之间的聚合。然后，加入四个基础聚合（事务，购买，恢复日志，购买日志）以进行最终查询。如果您汇总，在Transaction Data | Purchase Data row1: 1,1,1,11000,0,11000 | 1,1,1,25000,0,25000 row2: 2,1,1,500,0,500 | 1,1,1,25000,0,25000和ClientID，CurrencyID和TID进行分组，则联接将与1对1匹配。

PID

mysql sum（）使用多个连接返回double值

1 个答案: