mysql - 如何统计不同用户，获取用户的MaxDate和最新记录的UserId

Question

我想获取表中记录创建的最新日期 (CreatedDate)、UserId 和唯一用户总数。

这是我到目前为止所拥有的，但似乎不起作用。

Select UserId, MAX(CreatedDate), Count(Distinct UserID) AS 'Number of Users'
From DPP_Exports__Customers 

有人可以帮忙吗？

谢谢，

伊克巴尔

Answer 1

查询最新记录的UserId:

select userid,CreatedDate 
from DPP_Exports__Customers  
order by CreatedDate  desc limit 1;

查询每个用户的最大日期:

select userid,max(CreatedDate)
from DPP_Exports__Customers  
group by userid;

查询不同用户数:

select count(distinct userid) from DPP_Exports__Customers 

所有的单个查询:

select  cust.userid,max(cust.CreatedDate) as max_createdDate,
        (select count(distinct userid) from DPP_Exports__Customers) as distinct_user_count,
        (select userid from DPP_Exports__Customers order by CreatedDate  desc limit 1) as  latest_userid
from DPP_Exports__Customers  cust
group by cust.userid;