Question

我需要订购价格，但它有货币，所以它看起来并不那么容易。表：

lowmoney | topmoney | currency

1 | 99 | eur
2 | 59 | usd

以上示例意味着价格为1.99EUR和2.59 $。有大约5000个条目，我需要按实际价格订购，例如1.99EUR大于2.19 $，所以

ORDER BY lowmoney DESC, topmoney DESC

不起作用。

P.S。只有两种货币 - usd和eur。

Answer 1

select
  lowmoney,
  topmoney,
  currency
from TheTable
order by
  /* Order by amount in dollars (could calculate to euro as well) */
  (lowmoney + (topmoney / 100)) *
  case currency 
    when 'eur' then 1.3266 /* Current exchange rate, according to Google */
    when 'usd' then 1
  else
    null /* What to do with other currencies. */
  end desc

Answer 2

说你有：1 US dollar值得0.7618 Euro

然后

使用此

select concat(`lowmoney`,',', `topmoney`)as money,currency,
       case when `currency` = 'eur' then concat(lowmoney,',' ,topmoney) 
            when `currency` = 'usd' then concat(lowmoney,',' ,topmoney) *  0.7618
            end as money_in_euro  
 from table2
 order by money_in_euro asc

DEMO HERE

输出：

   MONEY    CURRENCY    MONEY_IN_EURO
   1,99       eur            1,99
   2,59       usd            1.5236

如果您有其他货币，只需添加WHEN currency ='gdgd'然后concat（...）* the_rate

根据货币订购价格

2 个答案: