sql - 列在选择列表中无效，因为它未包含在聚合函数或 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

• 您有用于聚合的 MAX，因此您需要 GROUP BY Id
• ...这将不起作用，因为您有 ROW_NUMBER
• 您确实想要楼层和用户之间存在笛卡尔积(CROSS JOIN)吗？
• 哪个列属于哪个表？

也许这可以帮助你到达你想要的地方:

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