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

I tried the following SQL Query and it is giving the error stated below:

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

Error

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

Table:

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

Answer 1

you have to city in group by

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

Answer 2

You are missing group by clause

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

Answer 3

You probably are looking for the longest city name.

Then order by descending length

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

Answer 4

Will this help?

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