帮助选择计数查询

Question

我想显示所有已经有count > 5的城市。我试图限制我的结果超过5的计数，但它不工作。

SELECT 
user.city, 
Count(user.city) AS cnt 
FROM user 
Inner Join zip ON zip.zip = user.zip 
WHERE cnt > 5 
GROUP BY user.city 
WHERE cnt > 5 **<--------------- It fails here** 

cnt已在字段列表中定义，为什么不起作用？

Answer 1

尝试使用HAVING语句：

例如：

select title, AVG(salary) 
from employee_data 
GROUP BY title 
HAVING AVG(salary) > 100000; 

Answer 2

尝试HAVING

SELECT user.city, 
     COUNT(user.city) AS cnt 
FROM user 
INNER JOIN zip ON zip.zip = user.zip 
GROUP BY user.city 
HAVING COUNT(user.city) > 5 

Answer 3

必须使用having cnt > 4当你分组

http://dev.mysql.com/doc/refman/5.0/en/group-by-hidden-columns.html