Question

我有以下查询，该查询根据用户来自网络还是移动用户来进行划分。我不仅要显示用户数，还要显示每个来源的总用户数百分比。如何在一个查询中计算？

select source, count(*) as total_users
from table
where is_active = 1
and source in ('web','mobile')
group by 1

Answer 1

SELECT
  *,
  total_users * 100.0 / SUM(total_users) OVER () AS percentage_of_total
FROM
(
    select source, count(*) as total_users
    from table
    where is_active = 1
    and source in ('web','mobile')
    group by source
)
  totals_by_source

https://dbfiddle.uk/?rdbms=sqlserver_2017&fiddle=6c0af52dcb10b072b876ae593773e148

Answer 2

尝试如下

 with cte as
   ( select source, count(*) as total_users     
    from table
    where is_active = 1
    and source in ('web','mobile')
    group by source
  ) SELECT source,total_users,  
   total_users * 100.0 / SUM(total_users) OVER () AS percentage from cte

Answer 3

另一个演示文稿：

SELECT
  100.0*count(case when source = 'mobile' then 1 end) as mcount/count(*),
  100.0*count(case when source = 'web' then 1 end) as wcount/count(*)
FROM
  t
WHERE 
  source in ('web','mobile') and is_active = 1

Answer 4

我只是使用窗口函数来写这个：

select source, count(*) as total_users,
       count(*) / sum(count(*)) over () as ratio
from table
where is_active = 1 and
      source in ('web', 'mobile')
group by source;

在列中查找总数的百分比

4 个答案: