MySQL 用数字对字符串值进行排序？

Question

我的数据是这样的：

KRYPTON-4xLV
KRYPTON-3xSTG
KRYPTON-16xTH
KRYPTON-8xTH
KRYPTON-8xLV

当我在此列上调用 ORDER BY 时，值按如下方式排序：

KRYPTON-16xTH
KRYPTON-3xSTG
KRYPTON-4xLV
KRYPTON-8xLV
KRYPTON-8xTH

有没有办法像这样排序？

KRYPTON-4xLV
KRYPTON-8xLV
KRYPTON-3xSTG
KRYPTON-8xTH
KRYPTON-16xTH

这里是 SQL fiddle: http://sqlfiddle.com/#!9/6d061/2

Answer 1

尝试以下操作：

select code
from (select *, substring(code, LOCATE('-', code) + 1, length(code)) o from products )t
order by 
substring(o, LOCATE('x', o), length(code)),
cast(o as UNSIGNED)

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