查詢排序順序問題

Question

我有兩個查詢，我進一步做一個聯合來獲得不同的結果。目前，它們按名稱按字母順序排序。

查詢1：

Corporate Comp D 
Corporate Comp E 

查詢2：

Corporate Comp A 
Corporate Comp B 
Corporate Comp D 
Corporate Comp E 
Corporate Comp G 

所以聯盟之後，結果是ABDE G.和字母順序排列的順序，但是，我想它首先訂購查詢，所以基本上我希望以類似

最終排序查詢

Corporate Comp D 
Corporate Comp E 
Corporate Comp A 
Corporate Comp B 
Corporate Comp G 

01工作

Answer 1

在這種情況下，請勿使用UNION。這裏是一個另類：

select qq.col 
from ((select q.col, 1 as which 
     from query1 q 
    ) union all 
     (select q.col, 2 as which 
     from query2 q 
     where not exists (select 1 from query1 q1 where q1.col = q.col) 
    ) 
    ) qq 
order by qq.which, qq.col; 

或者，你可以使用聚合：

select qq.col 
from ((select q.col, 1 as which 
     from query1 q 
    ) union all 
     (select q.col, 2 as which 
     from query2 q 
    ) 
    ) qq 
group by qq.col 
order by min(qq.which), qq.col; 

Answer 2

你可以試試這個： -

select 
    * 
from 
(
    select col from query1 
    union 
    select col from query2 
) d 
order by 
    case when col in (select col from query1) then 0 else 1 end, 
    col 

Answer 3

select  col 

from  (   select distinct 1 as i,col from query1 
      union all (select 2,col from query2 minus select 2,col from query1) 
      ) t 

order by i,col  
;