列在選擇列表中無效，因爲它不包含在聚合函數或GROUP BY子句中

Question

我有下面的sql查詢，但執行它時遇到問題。

SELECT * from (Select row_number() OVER(Order By FloorUserId) as 'row_number', FloorUserId, 
max(CASE WHEN AreaId='[G]' or AreaId=N'L01' THEN 'X' ELSE ' ' END) as 'L01', 
max(CASE WHEN AreaId='[G]' or AreaId=N'L02' THEN 'X' ELSE ' ' END) as 'L02' 
from floor, tbuser where FloorUserId= tbuser.userID 
    ) as derivedTable where row_number BETWEEN 1 AND 20 

但我不斷收到以下錯誤：

Column 'FloorId' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.

Answer 1

當你使用aggregrates（如最大）只能使用是一組的部分領域BY子句。

因此，如果你想要其他字段將它們添加到group by子句中，請刪除'*'。

Answer 2

• 你有MAX這是聚集所以你需要GROUP BY編號
• ...這將不會再工作，因爲你有ROW_NUMBER
• 你真的想要一個笛卡爾乘積（CROSS JOIN ）在地板和用戶之間？
• 什麼列屬於哪個表？

或許，這可以幫助你得到你想要的：

Select 
    row_number() OVER (PARTITION BY userid Order By user.Id) as 'row_number', user.Id, 
    max(CASE WHEN floor.AreaId='[G]' or floor.AreaId=N'L01' THEN 'X' ELSE ' ' END) as 'L01', 
    max(CASE WHEN floor. AreaId='[G]' or floor.AreaId=N'L02' THEN 'X' ELSE ' ' END) as 'L02' 
from 
    floor 
    JOIN 
    user ON floor. = user. --what? 
where 
    user.Id = userID 
group by 
    user.Id