为什么SQL DISTINCT不能与ORDER BY CAST一起使用？

Question

将DISTINCT包括到同样使用ORDER BY CAST(thecolumn AS int)的SQL查询中，如图所示here似乎删除了该排序功能。

这些不能合作的原因吗？ （使用sqlite与C api）

谢谢。

EDIT：
入门 -

sprintf(sql, "SELECT DISTINCT rowX FROM TableX Order By Cast(rowX As int) LIMIT 150 OFFSET %s;", Offset); 

一行x是类型CHAR（5）

NOW：

sprintf(sql, "Select rowX FROM(Select Distinct rowX From TableX)t Order By Cast(rowX As int) LIMIT 150 OFFSET %s;", Offset); 

Answer 1

我用sqlite以下，并排序工作正常：

Select Distinct thecolumn 
From your_table 
Order By Cast(thecolumn As int) 

---

你试过把DISTINCT成一个子查询？

Select thecolumn 
From 
(
    Select Distinct thecolumn 
    From your_table 
) t 
Order By Cast(thecolumn As int) 

我希望它能以这种方式工作。

---

另一种方式：

Select thecolumn 
From 
(
    Select Distinct Cast(thecolumn As int) As thecolumn 
    From your_table 
) t 
Order By thecolumn 

Answer 2

这是头超晚，但通过该命令有相匹配的选择列表尽然：

select distinct cast(column as int) 
from table 
order by cast(column as int)