Sql 如何计算条件聚合的百分比

我有一个数据表，见 使用pivot语句，我能够按标题分解计数

select division, status, 
       sum(case when title = 'worker' then 1 else 0 end) as workerCount,
       (sum(case when title = 'worker' then 1 else 0 end) /
        sum(sum(case when title = 'worker' then 1 else 0 end)) over ()
       )*100 as workerPercent
from ta
group by status, division
order by division, status

结果如下所示：

DIVISION  STATUS    WORKERCOUNT  WORKERPERCENT
11        ready     3            30
11        started   3            30
12        finished  4            40
12        ready     0            0
12        started   0            0

例如，我需要百分比除以除法

DIVISION  STATUS    WORKERCOUNT  WORKERPERCENT
11        ready     3            50
11        started   3            50
12        finished  4            100
12        ready     0            0
12        started   0            0

---

你知道我如何用SQL实现这一点吗

使用以下查询：

select division, status, 
       sum(case when title = 'worker' then 1 else 0 end) as workerCount,
       (sum(case when title = 'worker' then 1 else 0 end) /
        sum(sum(case when title = 'worker' then 1 else 0 end)) over (PARTITION BY division)
       )*100 as workerPercent
from ta
group by status, division
order by division, status

您缺少分析子句：

---

你非常接近你的预期结果

您只需在

分析函数

中添加

partition by

子句，如下所示：

---

干杯

正如其他海报所指出的，你可以（也应该）使用分析函数来解决这类问题

特别是对于您的用例，有

RATIO\u TO\u REPORT

函数-使用它比在您的尝试和几个答案中“手动”计算要好得多

请注意，我做的另一个更改-当“worker”和0“others”之和等于计数“worker”<在此上下文中，code>COUNT比

SUM

更清晰

select division, status, 
       count(case when title = 'worker' then 1 end) as workerCount,
       ratio_to_report(count(case when title = 'worker' then 1 end))
           over (partition by division)*100 as workerPercent
from  ta
group by status, division
order by division, status;

感谢您发布测试数据和您的尝试-这非常有帮助

SQL> SELECT
  2      DIVISION,
  3      STATUS,
  4      SUM(CASE WHEN TITLE = 'worker' THEN 1 ELSE 0 END) AS WORKERCOUNT,
  5      ( SUM(CASE WHEN TITLE = 'worker' THEN 1 ELSE 0 END) /
  6              SUM(SUM(CASE WHEN TITLE = 'worker' THEN 1 ELSE 0 END))
  7                  OVER( PARTITION BY DIVISION )  -- Changes here
  8      ) * 100 AS WORKERPERCENT
  9  FROM TA
 10  GROUP BY STATUS, DIVISION
 11  ORDER BY DIVISION, STATUS;

  DIVISION STATUS               WORKERCOUNT WORKERPERCENT
---------- -------------------- ----------- -------------
        11 ready                          3            50
        11 started                        3            50
        12 finished                       4           100
        12 ready                          0             0
        12 started                        0             0

SQL>

select division, status, 
       count(case when title = 'worker' then 1 end) as workerCount,
       ratio_to_report(count(case when title = 'worker' then 1 end))
           over (partition by division)*100 as workerPercent
from  ta
group by status, division
order by division, status;