SQL联盟：file_up表中选择ID

Question

我有两个表treeview_items和file_up

treeview_items

file_up

和查询（不是我写的）

SELECT * 
FROM treeview_items 
UNION 
    SELECT id + (select max(id) from treeview_items), name, 
      path as text,dir_id as parent_id 
    FROM file_up 

现在，我怎么能修改此查询，以便ID从file_up表也将在查询结果中列出？我尝试了一些东西，但仍然卡住！

电流输出和预期输出，这里的列名来自file_up的ID仅供演示。

Answer 1

不知道如果我让你在说什么，但你在找这样的事情？

SELECT *, WhateverID = NULL 
FROM treeview_items 
UNION 
    SELECT id + (select max(id) from treeview_items), name, 
      path as text,dir_id as parent_id, WhateverID 
    FROM file_up