用mysql数据获取余额答案

【问题标题】：Get the balance with mysql data用mysql数据获取余额
【发布时间】：2018-05-04 05:13:01
【问题描述】：

我有以下数据

    Date       Trans          Detail           Amt      Payment     
   5/4/18       Inv            Inv_1           100      0.00
   5/4/18       Inv            Inv_2           500      0.00
   5/4/18       Payment        Inv_1,Inv_2     0.0      400
   5/6/18       Inv            Inv_2           500      0.00
   5/6/18       Payment        Inv_2           0.0      600
   5/6/18       credit         credit          500      0.00
   5/8/18       Inv            Inv_3           100      0.00

我需要查询以下结果中的余额

   Date       Trans          Detail           Amt      Payment    Balance   
   5/4/18       Inv            Inv_1           100      0.00        100
   5/4/18       Inv            Inv_2           500      0.00        600
   5/4/18       Payment        Inv_1,Inv_2     0.0      700        -100
   5/6/18       Inv            Inv_2           500      0.00        400
   5/6/18       Payment        Inv_2           0.0      600        -200
   5/6/18       credit         credit          500      0.00       -700
   5/8/18       Inv            Inv_3           100      0.00       -600

到目前为止，我已经尝试过，但搞砸了，请告诉我任何解决方案来获得平衡？

SELECT t4.invoicedate,t4.transcation,t4.details,t4.amount,t4.payments,t4.balance,
CASE WHEN  t4.transcation='Payment Received'  THEN @c:=@c+t4.balance -t4.payments   END  AS paymentbal  
 FROM 
(SELECT @c:=0.0) AS dummyb
CROSS JOIN (
SELECT * FROM (SELECT t1.InvoiceHeaderId,t1.invoicedate,t1.transcation,t1.details,t1.amount,t1.payments,
  @d:= @d+t1.amount  AS balance 
    FROM 
(SELECT @d:=0.0) AS dummy
CROSS JOIN   

  ( SELECT a.InvoiceHeaderId,a.InvoiceDate,'Invoice'AS transcation,CONCAT(a.InvoiceNumber, ',',a.DueDate)details,a.Total AS amount,
 0 payments  FROM Table_Invoice a
  WHERE  a.InvoiceDate BETWEEN '2018-02-02' AND '2018-02-06' 
  GROUP BY  a.InvoiceDate,a.InvoiceNumber,a.DueDate,a.InvoiceHeaderId)t1
  UNION ALL
 SELECT  '',PaymentDate AS invoicedate,'Payment Received'AS transcation,ReferenceNumber AS details,0 amount,SUM(Total)payments,0 balance FROM 
    Table_PaymentReceived  WHERE PaymentDate BETWEEN '2018-02-02' AND '2018-02-06'
    GROUP BY PaymentDate
 UNION ALL
  SELECT '',CreditNoteDate AS invoicedate,'Return Credits ' AS transcation,ReferenceNumber AS details,SUM(Total)amount,0 payments,0 balance FROM 
    Table_CreditNotes   WHERE CreditNoteDate BETWEEN '2018-02-02' AND '2018-02-06'
    GROUP BY CreditNoteDate)t2 ORDER  BY CAST(t2.invoicedate AS DATE),t2.transcation,t2.details)t4

【问题讨论】：

到目前为止你做了什么。以及如何计算余额
你使用的是什么 MySQL 版本？
您要查找的术语是“累积和”，它应该提供足够的信息来进行一些尝试。
当前使用 9.6 beta2
数据库版本而不是数据库连接器。它应该是 8 或更少。

标签： mysql balance

【解决方案1】：

查看下面的代码，这是我们计算余额的逻辑，它解决了您的问题。如果您仍然遇到此问题，请告诉我们。

select Date,Trans,Detail,Amt,Payment(@r := @r + Amt)-(@p:=@p+Payment) balance
from (select * from Table_Invoice order by date asc),
(select @r:=0, @p:=0) s;

【讨论】：