我试图减去卖出的美元兑买入的美元.

**|Tran_ID|Currency_type|currency_Amount|Local_Amount| Rate |Tran_type| **

| 85 | USD | 2500 | 1581.54 |1.58074 | Bought |

| 78 | USD | 3487.57 | 2206.29 |1.58074 | Bought |

| 86 | USD | 100 | 63.26 |1.58074 | Bought |

| 87 | USD | 94.17 | 63.26 |1.48866 | Sold |

| 88 | USD | 2600 | 1746.54 |1.48866 | Sold |

| 89 | USD | 2600 | 1746.54 |1.48866 | Sold |

我可以使用下面的查询添加已售出或已购买的美元总价值

SELECT Currency_type, sum( currency_Amount ) AS total_bought

FROM Transaction

WHERE Currency_type= 'USD'

AND Tran_type = 'Bought' <== **or 'Sold'**

**|Currency_type | total_bought |**

|USD |6087.570068359375|

解决方法:

您只需在交易类型上设置标志:

SUM(currency_Amount * IF(Tran_type = "Bought", 1, -1))

标签:sql,mysql

来源: https://codeday.me/bug/20190725/1534801.html

mysql _ 一列 分多行操作,在一个表里的几行数据需要分拆成单行存储到一 行中 mysql _ 一列 分多行操作,在一个表里的几行数据需要分拆成单行存储到一 行中 mysql _ 一列 分多行操作,在一个表里的几行数据需要分拆成单行存储到一 行中 mysql _ 一列 分多行操作,在一个表里的几行数据需要分拆成单行存储到一 行中 让我们首先创建一个表-createtableDemoTable741(Numberint);使用插入命令在表 插入一些记录-insertintoDemoTable741values(70);insertintoDemoTable741values(55);insertintoDemoTable741values(89);insertintoDemoTable741v... SELECT isnull(A,0)-isnull(B,0) AS 结果 FROM 表 --sqlserver语法 SELECT nvl(A,0)-nvl(B,0) AS 结果 FROM 表 --Oracle语法 SELECT ifnull(A,0)-ifnull(B,0) AS 结果 FROM 表 -- mysql 语法 (select (SELECT settlement_amount FROM `domestic_vendor_statements` where billing_month='202203') a, (SELECT settlement_amount FROM `domestic_vendor_statements` where billing_month='202204') b) as 表结构? 测试数据?按哪 一列 排序?测试数据.CREATE TABLE temp (year INT,salary INT);INSERT INTO temp VALUES(2000, 1000);INSERT INTO temp VALUES(2001, 2000);INSERT INTO temp VALUES(2002, 3000);INSERT INTO temp VALUES(... I want to display the subtraction of two values from two different columns to a third column using a SQL query.This is the table structure:------------------------------------id | subject | Time1 | Ti...