获取3个或3个以上员工来自同一城市的员工名单？

Question

我使用以下查询来查找具有3个以上员工的城市名称

SELECT M.NAME
FROM MasterCity M
INNER JOIN Employee E ON E.CityID = M.ID
GROUP BY E.CityID
HAVING count(E.CityID) >= 3;

它给了我以下错误

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

怎么了.？提前致谢

Answer 1

变种#1 -

SELECT MAX(M.Name) AS Name
FROM MasterCity M 
JOIN Employee E ON E.CityID = M.ID
GROUP BY E.CityID
HAVING COUNT(E.CityID) >= 3;

变种#2 -

SELECT M.Name
FROM MasterCity M 
JOIN Employee E ON E.CityID = M.ID
GROUP BY E.CityID, M.Name
HAVING COUNT(E.CityID) >= 3;