Question

我希望5月到6月之间的货币汇率变动与以捷克克朗（捷克克朗）借入的贷款总额相对于欧元表示不同。例如：由于汇率变动，5月份人们从我公司借来的款项为27M捷克克朗（相当于1M欧元），由于货币汇率的变动，6月仅为0.89M欧元。

我来了：

    SELECT
    SUM((
       SELECT Rate
       FROM s96.CurrencyRates
       WHERE (YEAR(Date)=2017) AND (MONTH(Date)=5)
       ) * t.ApprovedLoanAmount)
      -
    SUM((
       SELECT Rate
       FROM s96.CurrencyRates
       WHERE (YEAR(Date)=2017) AND (MONTH(Date)=6)
       ) * t.ApprovedLoanAmount)
    AS currChange
FROM(
        SELECT ApprovedLoanAmount
       FROM dim.Contract con
          JOIN dim.Calendar cal ON con.CreateDateID = cal.DateId
       WHERE (cal.CalendarYear = 2017) AND (cal.MonthOfYear = 5)
      ) t

返回：

无法对包含聚合或子查询的表达式执行聚合函数。

任何帮助都会受到重视。

Answer 1

更改查询的选项很少。您可以计算子查询中的当前速率，并在1 = 1时使用左连接。您还可以将总和语句更改为：

SELECT
((
       SELECT SUM(Rate)
       FROM s96.CurrencyRates
       WHERE (YEAR(Date)=2017) AND (MONTH(Date)=5)
       ) * t.ApprovedLoanAmount)
     -
    ((
       SELECT SUM(Rate)
       FROM s96.CurrencyRates
       WHERE (YEAR(Date)=2017) AND (MONTH(Date)=6)
       ) * t.ApprovedLoanAmount)
    AS currChange
FROM(
        SELECT ApprovedLoanAmount
       FROM dim.Contract con
          JOIN dim.Calendar cal ON con.CreateDateID = cal.DateId
       WHERE (cal.CalendarYear = 2017) AND (cal.MonthOfYear = 5)
      ) t

Answer 2

我不知道你的确切表格如何，所以想想这个更像是一个片段而不是复制/粘贴解决方案：

SELECT 
  SUM(ApprovedLoanAmount) AS ApprovedLoanAmountCZK
, SUM(ApprovedLoanAmountEUR_May) AS ApprovedLoanAmountEUR_May
, SUM(ApprovedLoanAmountEUR_June) AS ApprovedLoanAmountEUR_June
, SUM(ApprovedLoanAmountEUR_May) - SUM(ApprovedLoanAmountEUR_June) AS CurrChange
FROM 
(
   SELECT ApprovedLoanAmount
   , ApprovedLoanAmount * (SELECT Rate
                           FROM s96.CurrencyRates rM
                           WHERE rM.Date = cal.Date -- date of contract?
                          AND rM.Currency = 'EUR' -- if you have other currencies rates in same table
   ) AS ApprovedLoanAmountEUR_May
   , ApprovedLoanAmount * (SELECT Rate
                        FROM s96.CurrencyRates rJ
                        WHERE rJ.Date = '20170630'
                        AND rJ.Currency = 'EUR'
   ) AS ApprovedLoanAmountEUR_June
   FROM dim.Contract con
   JOIN dim.Calendar cal ON con.CreateDateID = cal.DateId
   WHERE (cal.CalendarYear = 2017) AND (cal.MonthOfYear = 5)
) t

确保两个Rate子查询每个只返回一行
将cal.Date和rM.Currency替换为您的确切列
如果您希望5月底的费率而非合约日期，请将cal.Date替换为'20170531'

如何在货币汇率变动方面做出差异

2 个答案: