sql - 获取3名或3名以上来自同城的员工列表？

Question

我使用以下查询来查找拥有超过 3 名员工的城市名称

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

变体 #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;

变体 #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;