Question

我想绘制一段时间内连接Twitter帐户的用户百分比。用户数量不断变化，连接Twitter帐户的百分比也在不断变化。

该表格包含特定于用户帐户的createDateTime列以及tw_connectDateTime列。

假设我对过去7天内连线趋势感兴趣。有没有办法让MSSQL计算指定范围内每一天的百分比，或者我是否需要使用多个查询自己完成？

在app逻辑中执行它看起来像（伪代码）：

for day in days:
    query:
        select 
            count(userId) as totalUsers
            ,c.connected
            ,cast(c.connected as float)/count(userId) as percentage
        from 
            Users
            outer apply ( 
                select 
                    count(userId) as connected 
                from 
                    Users
                where 
                    tw_connectDateTime <= $day
            ) as c 
        where
            createDateTime <= $day
        group by
            c.connected

我不确定的是，如果可能的话，如何扩展它以便每天运行，以便结果包括日期作为列和我从每个运行上面的查询得到的相同值日期在范围内。

有可能吗？如果是这样，怎么样？

Answer 1

实际上你可以使用你的查询加入日期，如下所示：

 with cte_days as (
     select @DateStart as day
     union all
     select dateadd(dd, 1, c.[day]) as [day]
     from cte_days as c
     where c.[day] < @DateEnd
 )
 select
     d.[day],
     count(u.userId) as totalUsers,
     c.connected,
     cast(c.connected as float)/count(u.userId) as percentage
 from cte_days as d
     inner join Users as u on u.createDateTime <= d.[day]
     outer apply ( 
         select 
             count(T.userId) as connected 
         from Users as T
         where T.tw_connectDateTime <= d.[day]
    ) as c 
 group by d.[day], c.connected

查询MSSQL日期范围内的运行百分比？

1 个答案: