问题描述
考虑以下架构:
create table UserInterests
(UserName varchar(20),InterestID int
primary key (UserName,InterestID)
)
现在,如果我想找到用户最共同的兴趣(用户数量最多的兴趣),我该怎么做。
我的尝试如下:
select InterestID,CountInterest
from (select InterestID,count (*) as CountInterest
from UserInterests
group by InterestID) as x
where x.CountInterest = (select max (CountInterest)
from x)
但是在执行时它说,x 是一个无效的对象。那么我应该如何处理这种情况?
解决方法
试试这个...
;with cte
as (
select InterestID,count (*) as CountInterest
from UserInterests
group by InterestID
)
select top(1) InterestID,countInterest
from cte
order by countInterest desc