爲什麼SQL DISTINCT不能與ORDER BY CAST一起使用？

Question

將DISTINCT包括到同樣使用ORDER BY CAST(thecolumn AS int)的SQL查詢中，如圖所示here似乎刪除了該排序功能。

這些不能合作的原因嗎？ （使用sqlite與C api）

謝謝。

EDIT：
入門 -

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

一行x是類型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，並排序工作正常：

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

---

你試過把DISTINCT成一個子查詢？

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

我希望它能以這種方式工作。

---

另一種方式：

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

Answer 2

這是頭超晚，但通過該命令有相匹配的選擇列表盡然：

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