Question

我有一个用户和一个活动表。

用户拥有积分活动

用户 id，name

user_activities， id，user_id，points

现在我想获得最高分数低于100的用户列表：

select top 1[name], SUM(user_activities.points) as userpoints 
    from [users] inner join [user_activities] on [users].[id] = [user_activities].[user_id]  
    WHERE [userpoints] < 100 
    group by [name]
    order by [userpoints] desc

不幸的是我收到一条错误消息：未知列用户点

Answer 1

过滤聚合是通过HAVING：

完成的

select top 1[name], 
SUM(user_activities.points) as userpoints 

from [users] 

inner join [user_activities] 
    on [users].[id] = [user_activities].[user_id]  
group by [name]
HAVING SUM(user_activities.points) < 100 
order by SUM(user_activities.points) desc

在Where和order中使用聚合

1 个答案: