列在选择列表中无效，因为它不包含在聚合函数或GROUP BY子句中

Question

我有下面的sql查询，但执行它时遇到问题。

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 

但我不断收到以下错误：

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

当你使用aggregrates（如最大）只能使用是一组的部分领域BY子句。

因此，如果你想要其他字段将它们添加到group by子句中，请删除'*'。

Answer 2

• 你有MAX这是聚集所以你需要GROUP BY编号
• ...这将不会再工作，因为你有ROW_NUMBER
• 你真的想要一个笛卡尔乘积（CROSS JOIN ）在地板和用户之间？
• 什么列属于哪个表？

或许，这可以帮助你得到你想要的：

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