mysql中使用case语句更新表

我想使用case语句更新多个列，我实现了这一点，但这并不是我必须三次完成同一任务的最佳方式，我如何在一个语句中实现这是我的测试sql脚本：

 Delimiter //
create procedure test_f()
begin
update test set 
    #### total####
        test.total = case when test.currencyid='INR' then  test.total/85.09
        Else test.total End,
        test.total = case when test.currencyid='SEK' then  test.total/8.97
        Else test.total End,

    ### Commission ####
        test.commission = case when test.currencyid='INR' then  test.commission/85.09
        Else test.commission End,
        test.commission = case when test.currencyid='SEK' then  test.commission/8.97
        Else test.commission End,


        test.currencyid = case when test.currencyid in ('SEK','INR') then  'EUR'
        Else test.currencyid End


WHERE test.currencyid in ('SEK','INR') ;
END //

---

现在我想根据currencyid更新所有三列

对于第一种情况，您可以尝试以下方法： 而不是：

update test set 
#### total####
    test.total = case when test.currencyid='INR' then  test.total/85.09
    Else test.total End,
    test.total = case when test.currencyid='SEK' then  test.total/8.97
    Else test.total End,

改为：

update test set 
#### total####
    test.total = 
      case when test.currencyid='INR' then  test.total/85.09
           when test.currencyid='SEK' then  test.total/8.97
      Else test.total 
      End,

---

对

##########

我倾向于将查询写为：

update test t 
        set t.total = t.total / (case when t.currencyid = 'INR' then 85.09 else 8.97 end),
            t.commission = t.commission / (case when t.currencyid = 'INR' then 85.09 else 8.97 end),
            t.currency = 'EUR'
    where t.currencyid in ('INR', 'SEK') ;

---

where

子句将货币限制为上述两种情况，因此

案例

只需测试这两种情况。简化case语句还可以更清楚地表明，两种计算都使用相同的逻辑。

我想更新总计、佣金和货币，例如更新表testset commission=123，total=123，currencyid='EUR'，其中currencyid='euro'