查詢排序順序問題

Question

我有兩個查詢，我進一步對它們進行了合並以獲得不同的結果。 當前，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

因此，在合並后，結果為ABDE G.及其按字母順序排列的順序，但是，我希望通過第一個查詢對其進行排序，所以基本上我希望該順序像

最終排序查詢

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

Answer 1

在這種情況下，請勿使用UNION 。 這是一個替代方案：

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，您可以使用聚合：

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

您可以嘗試以下方法：

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      
 ;