如何在数据透视语句中包含百分比计算

Posted 2023-03-24

【中文标题】如何在数据透视语句中包含百分比计算

【英文标题】：How to include percent calculations in pivot statement

【发布时间】：2020-01-29 18:34:35

【问题描述】：

使用数据透视语句，我可以按标题分解数据表中的计数：

select * from (
  select * from ta
)
pivot (
COUNT(title)
 for title in ( 'worker', 'manager') )

所以结果是这样的：

STATUS    'worker'  'manager'
started   3         1
finished  4         5
ready     3         4

我需要添加的是百分比，即

STATUS    'worker'  percent  'manager'   percent
started   3         30%      1           10%
finished  4         40%      5           50%
ready     3         30%      4           40%

知道如何在同一个语句中完成此操作吗？ 见http://sqlfiddle.com/#!4/e6c04a/1/0

【参考方案1】：

而不是使用条件聚合，您可以使用 -

select STATUS
      ,WORKER
      ,WORKER/SUM(WORKER) OVER()*100 percent
      ,MANAGER
      ,MANAGER/SUM(MANAGER) OVER()*100 percent 
from (
  select * from ta
)
pivot (
COUNT(title)
 for title in ( 'worker' AS WORKER, 'manager' AS MANAGER))

Here 是演示。

【参考方案2】：

使用条件聚合和窗口函数：

select status,
       sum(case when title = 'worker' then 1 else 0 end) as worker,
       sum(case when title = 'manager' then 1 else 0 end) as manager,
       (sum(case when title = 'worker' then 1 else 0 end) /
        sum(sum(case when title = 'worker' then 1 else 0 end)) over ()
       ) as worker,
       (sum(case when title = 'manager' then 1 else 0 end) /
        sum(sum(case when title = 'manager' then 1 else 0 end)) over ()
       ) as manager
from ta
group by status;

Here 是一个 sql小提琴。