列 'City.Name' 在 select 列表中无效，因为它不包含在聚合 function 或 GROUP BY 子句中

Question

我尝试了以下 SQL 查询，它给出了以下错误：

Select TOP 1 CITY,MAX(LEN(CITY)) 
from STATION 
ORDER BY CITY ASC

错误

列 'STATION.CITY' 在 select 列表中无效，因为它不包含在聚合 function 或 GROUP BY 子句中。

桌子：

CREATE TABLE City (
  ID Integer NOT NULL,
  PRIMARY KEY (ID),
  Name VARCHAR (255),
  CountryCode VARCHAR (255),
  District VARCHAR (255),
  PopulationofCity Integer
);

Answer 1

你必须按组城市

 Select TOP 1 CITY,MAX(LEN(CITY)) 
 from STATION group by CITY
 ORDER BY CITY ASC

Answer 2

您缺少 group by 子句

Select TOP 1 CITY,MAX(LEN(CITY)) from STATION 
group by city
ORDER BY CITY ASC

Answer 3

您可能正在寻找最长的城市名称。

然后按长度降序排列

SELECT TOP 1 CITY, LEN(CITY)
FROM STATION
GROUP BY CITY
ORDER BY LEN(CITY) DESC

Answer 4

这会有帮助吗？

SELECT TOP 1 * FROM (
SELECT DISTINCT CITY,LEN(CITY) AS CITYLENGTH FROM STATION ) A ORDER BY A.CITYLENGTH DESC