您如何获得每个特定计数分组的记录百分比

Question

我在名为 users

的 table 中有以下数据

   userId   | orgId 
    1       | 1           
    2       | 1            
    3       | 2        
    4       | 2       
    5       | 2

我在名为 activities

的 table 中有以下数据

userId   | activityId | type
1        | 11         | a    
1        | 12         | a     
1        | 13         | a
1        | 14         | b
1        | 15         | b
1        | 16         | c     
1        | 17         | c
1        | 18         | c
2        | 19         | a
2        | 20         | a
2        | 21         | c
2        | 22         | c

我需要能够计算每个 orgId 用户中的百分比：

在activities' table where类型中只有 1 条记录` = 'c'
在 activities table 中有 5 条记录，其中 type = 'c'
在 activities table 中有 10 条记录，其中 type = 'c'
他们 50% 的记录在 activities table 其中 type = 'c'
他们 80% 的记录在 activities table 其中 type = 'c'

所以结果应该是这种（希望是可能的）格式：

orgId|% who have 1| % who have 5| % who have 10| % who have 50%| % who have 80% 
1    | 20         | 54          | 12           | 23            | 32
2    | 22         | 44          | 32           | 44            | 2
3    | 28         | 34          | 24           | 11            | 43
4    | 10         | 14          | 27           | 25            | 45

感谢您的帮助。

Answer 1

您可以使用 "conditional aggregation" 获取每个用户的计数和百分比：

select userId,
  sum(type = 'c') as countC,
  sum(type = 'c') * 100 / count(*) as percentC
from activities
group by userId

您的示例数据的结果将是：

| userId | countC | percentC |
|--------|--------|----------|
|      1 |      3 |     37.5 |
|      2 |      2 |       50 |

这可以用作与 users table 连接的子查询。然后你可以再次使用 "conditional aggregation" 得到预期的结果：

select u.orgId,
  sum(countC = 1) as `only 1`,
  sum(countC >= 5) as `at least 5`,
  sum(countC >= 10) as `at least 10`,
  sum(percentC >= 50) as `at least 50%`,
  sum(percentC >= 80) as `at least 80%`
from (
  select userId,
    sum(type = 'c') as countC,
    sum(type = 'c') * 100 / count(*) as percentC
  from activities
  group by userId
) a
join users u using(userId)
group by u.orgId

您的样本数据不是该查询的最佳数据。但是你会得到：

| orgId | only 1 | at least 5 | at least 10 | at least 50% | at least 80% |
|-------|--------|------------|-------------|--------------|--------------|
|     1 |      0 |          0 |           0 |            1 |            0 |

演示：http://sqlfiddle.com/#!9/b30dae/2

您如何获得每个特定计数分组的记录百分比

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