Sql 如何将特定月份内签订的所有合同的价值与其进行比较'；以外币表示的当前值

我想将一天内签订的贷款合同的价值与特定月份内相应的货币汇率（捷克克朗/欧元）进行比较，并说明合同相对于当月的价值（比如6月）

例如：

到目前为止，我有：

;WITH orig AS (
       SELECT 
          origEUR = SUM(ApprovedLoanAmount / cr.Rate)
          ,sumCZK = SUM(ApprovedLoanAmount)
       FROM dim.Contract con
          JOIN dim.Calendar cal ON con.CreateDateID = cal.DateID
          JOIN s96.CurrencyRates cr ON cr.Date = cal.Date
       WHERE (YEAR(cal.Date)=2017) AND (MONTH(cal.Date)=5) AND (CurrencyID = 1)
)

SELECT
    diff = orig.origEUR - (sumCZK / cr.Rate) --as to the current rate at the end of June
FROM orig orig
    JOIN s96.CurrencyRates cr --???
WHERE (YEAR(Date)=2017) AND (MONTH(Date)=6) AND (DAY(Date)=30) AND (CurrencyID = 1)

---

我希望，我已经把我的想法讲清楚了：-）

在条件下，可以将常量作为

的一部分

;WITH orig AS (
       SELECT 
          origEUR = SUM(ApprovedLoanAmount / cr.Rate)
          ,sumCZK = SUM(ApprovedLoanAmount)
       FROM dim.Contract con
          JOIN dim.Calendar cal ON con.CreateDateID = cal.DateID
          JOIN s96.CurrencyRates cr ON cr.Date = cal.Date
       WHERE (YEAR(cal.Date)=2017) AND (MONTH(cal.Date)=5) AND (CurrencyID = 1)
)

SELECT
    diff = orig.origEUR - (sumCZK / cr.Rate) --as to the current rate at the end of June
FROM orig orig
    JOIN s96.CurrencyRates cr ON cr.Date = CONVERT( DATETIME, '[Pick a date]' ) -- e.g. CONVERT( DATETIME, '2017-07-01' )
WHERE (YEAR(Date)=2017) AND (MONTH(Date)=6) AND (DAY(Date)=30) AND (CurrencyID = 1)

你能给我们一些表格定义和数据示例吗？
;WITH orig AS (
       SELECT 
          origEUR = SUM(ApprovedLoanAmount / cr.Rate)
          ,sumCZK = SUM(ApprovedLoanAmount)
       FROM dim.Contract con
          JOIN dim.Calendar cal ON con.CreateDateID = cal.DateID
          JOIN s96.CurrencyRates cr ON cr.Date = cal.Date
       WHERE (YEAR(cal.Date)=2017) AND (MONTH(cal.Date)=5) AND (CurrencyID = 1)
)

SELECT
    diff = orig.origEUR - (sumCZK / cr.Rate) --as to the current rate at the end of June
FROM orig orig
    JOIN s96.CurrencyRates cr ON cr.Date = CONVERT( DATETIME, '[Pick a date]' ) -- e.g. CONVERT( DATETIME, '2017-07-01' )
WHERE (YEAR(Date)=2017) AND (MONTH(Date)=6) AND (DAY(Date)=30) AND (CurrencyID = 1)