在MySQL中使用货币符号排序价格

Question

我在表格中有一个价格为

的价格字段

$5000
$500
$6000
$4000

我想按升序排序。

我试过

ORDER BY SUBSTRING_INDEX('price', '$', 1),
CAST(SUBSTRING_INDEX(`price`, '$', -1) AS SIGNED)

但它不起作用。

Answer 1

SELECT CAST(SUBSTRING_INDEX(price, '$', -1) AS SIGNED)
FROM test
ORDER BY 1

Answer 2

select * from (select '$400' cur                                                                                     
    -> union                                                                                                                           
    -> select '$600' cur                                                                                                               
    -> union                                                                                                                           
    -> select '$200' cur) t                                                                                                            
    -> order by substring(cur,2) desc; 

简而言之，substring by order by子句。所以，您应该编写类似

的查询

SELECT column1,column2 from your table 
order by substring(currency_column,2) desc|asc; 

Answer 3

按CAST从测试订单中选择价格（SUBSTRING_INDEX（价格，＆＃39; $＆＃39;， - 1）已签名）