Sql server 更新不使用案例…当…其他时

这看起来应该很容易，当我做一个简单的选择时，一切都很好，但是当我尝试运行更新时，我得到一个错误，它说“不正确的语法接近大小写”

Update    TBL_FBNK_CURRENCY_HIST 
SET       CURRENCY_FBNK = CURRENCY.Currency_Code,
          CURRENCY_ASOFDATE = CURRENCY.ASOFDATE,
          CURRENCY_MID_REVAL_RATE = CURRENCY.MID_REVAL_RATE,
          ORIGINAL_AMOUNT = MM_HIST.PRINCIPAL
          REPORTABLE_AMOUNT = REVAL_BALANCE
                CASE WHEN CURRENCY.ID IN('AUD','EUR','GBP','NZD','XAG','XAU','XPD','XPT') 
                    THEN (MM_HIST.PRINCIPAL * CURRENCY.Mid_Reval_Rate)
                    ELSE (MM_HIST.PRINCIPAL / CURRENCY.Mid_Reval_Rate) END AS REVAL_BALANCE
From      TBL_FBNK_CURRENCY_HIST AS CURRENCY INNER JOIN JOIN TBL_MULTI_MM_HIST AS MM_HIST 
          ON CURRENCY.Currency_Code = MM_HIST.Currency
          AND CURRENCY.ASOFDATE = MM_HIST.ASOFDATE

---

这里到底出了什么问题？

您在

MM\u HIST.PRINCIPAL

和

可报告金额

之间遗漏了一个昏迷，在

REVAL\u BALANCE

和

CASE

之间遗漏了另一个昏迷。另外，您只使用

CASE

语句返回一个值，但没有将其赋值给任何对象

假设按字段名将

案例的结果分配给
可报告金额

Update    TBL_FBNK_CURRENCY_HIST 
SET       CURRENCY_FBNK = CURRENCY.Currency_Code,
          CURRENCY_ASOFDATE = CURRENCY.ASOFDATE,
          CURRENCY_MID_REVAL_RATE = CURRENCY.MID_REVAL_RATE,
          ORIGINAL_AMOUNT = MM_HIST.PRINCIPAL,
          REPORTABLE_AMOUNT = CASE WHEN CURRENCY.ID IN('AUD','EUR','GBP','NZD','XAG','XAU','XPD','XPT') 
                THEN (MM_HIST.PRINCIPAL * CURRENCY.Mid_Reval_Rate)
                ELSE (MM_HIST.PRINCIPAL / CURRENCY.Mid_Reval_Rate) END
From      TBL_FBNK_CURRENCY_HIST AS CURRENCY INNER JOIN JOIN TBL_MULTI_MM_HIST AS MM_HIST 
          ON CURRENCY.Currency_Code = MM_HIST.Currency
          AND CURRENCY.ASOFDATE = MM_HIST.ASOFDATE

整个
CASE…END
构成一个表达式。您的错误是将别名REVAL_BALANCE指定给CASE表达式的结果，这在select中有意义，但在更新中没有意义

为更新使用分配，如下所示：

REPORTABLE_AMOUNT = CASE WHEN CURRENCY.ID IN('AUD','EUR','GBP','NZD','XAG','XAU','XPD','XPT') 
                THEN (MM_HIST.PRINCIPAL * CURRENCY.Mid_Reval_Rate)
                ELSE (MM_HIST.PRINCIPAL / CURRENCY.Mid_Reval_Rate) END

或者您是否需要将
REVAL_BALANCE
与货币兑换率相乘？在本例中，您只是忘记键入乘法运算符（*）。这可以是：

UPDATE TBL_FBNK_CURRENCY_HIST SET       
    CURRENCY_FBNK = CURRENCY.Currency_Code,
    CURRENCY_ASOFDATE = CURRENCY.ASOFDATE,
    CURRENCY_MID_REVAL_RATE = CURRENCY.MID_REVAL_RATE,
    ORIGINAL_AMOUNT = MM_HIST.PRINCIPAL,
    REPORTABLE_AMOUNT = REVAL_BALANCE * CASE WHEN 
        CURRENCY.ID IN('AUD','EUR','GBP','NZD','XAG','XAU','XPD','XPT') 
        THEN (MM_HIST.PRINCIPAL * CURRENCY.Mid_Reval_Rate)
        ELSE (MM_HIST.PRINCIPAL / CURRENCY.Mid_Reval_Rate) END
From TBL_FBNK_CURRENCY_HIST AS CURRENCY 
INNER JOIN JOIN TBL_MULTI_MM_HIST AS MM_HIST ON CURRENCY.Currency_Code = MM_HIST.Currency AND CURRENCY.ASOFDATE = MM_HIST.ASOFDATE

案例的结果更新了哪些内容？您似乎在
MM\u HIST.PRINCIPAL
（1）您是否厌倦了添加逗号（2）您试图将大小写表达式的结果分配给什么？在
MM\u HIST.PRINCIPAL
之后也缺少逗号！！就这样，乔希！谢谢现在该回家休息了。我想在办公室呆太久会让人一时哑口无言。我很好奇什么样的商业规则需要除法而不是乘法，这取决于货币？对于某些货币，换算系数是相互存储的吗？我问了同样的问题！基本上，当涉及外汇时，你应该用汇率乘以一切，或者用汇率除以一切。在我的s***a**公司，他们有自己的（非标准化）做事方式。