Question

假设我有

SELECT `Type`, `Originating Country Code`,`Originating Currency Code`, SUM(`Principal Amount`) as Total 
FROM `colab` 
WHERE (`Destination Country Code`='PH' 
    AND `Destination Currency Code`='PHP'
    AND `Type` = 'PAID') || (`Destination Country Code`='PH' 
    AND `Destination Currency Code`='USD'
    AND `Type`= 'PAID')
    GROUP BY `Type`

工作正常并返回true请见下文

country_code | Currency_Code  |   Type    |  Principal

=======================================================
| PH         |   PHP          |    PAID   |    200
=======================================================

我的问题是我想用美元价值分离货币总本金额。请查看我的数据库中的记录

country_code | Currency_Code  |   Type    |  Principal

=======================================================
| PH         |   PHP          |    PAID   |    100
| PH         |   USD          |    PAID   |    100
=======================================================

Answer 1

尝试此查询：

SELECT `Currency_Code`, SUM(`Principal Amount`) as Total 
FROM `table`
GROUP BY `Currency_Code`

Answer 2

您可以像GROUP BY这样使用：

SELECT `Currency_Code`, SUM(`Principal Amount`) as Total 
FROM `table` 
WHERE `Country Code`='PH'
    AND `Type` LIKE '%W%'
GROUP BY `Currency_Code`

如果您想添加更多条件，只需使用WHERE或AND向OR子句添加更多部分，例如：

SELECT `Currency_Code`, SUM(`Principal Amount`) as Total 
FROM `table` 
WHERE `Country Code`='PH'
    AND `Type` LIKE '%W%'
    AND `Currency_Code` IN('USD', 'CAD', 'YEN')
    AND `Principal_Amount` > 10
GROUP BY `Currency_Code`

Answer 3

您需要使用GROUP BY

即

SELECT `Currency Code`, SUM(`Principal Amount`) as Total 
FROM `table` 
WHERE `Country Code`='PH' 
    AND `Type` LIKE '%W%'
GROUP BY `Currency Code`

Answer 4

你不能根据你的要求改变查询吗？我的意思是从您的预期结果我推断您需要基于Type或country_code的结果，因此从查询中删除“AND Currency Code ='PHP'”将为您提供预期的结果。

Answer 5

将您的条件分解为子查询并加入其中。只需添加任意数量的规则即可。

SELECT `Country Code`, `Currency Code`, `Type`,
       SUM(`Principal Amount`) as Total 
FROM `table` 
JOIN (
    SELECT 'PH' as a, 'PHP' as b, '%W%' as c
    UNION SELECT 'PH', 'USD', '%W%'
    UNION SELECT 'PY', 'PYC', '%H%'
) AS criteria
    ON (`table`.`Country Code` = criteria.a and
        `table`.`Currency Code` = criteria.b and
        `table`.`Type` like criteria.c)
GROUP BY `Country Code`, `Currency Code`, `Type`

使用mysql中的条件SELECT SUM（）

5 个答案: