当单个字段是 GROUP BY 中的多个字段之一时，如何汇总该字段的数据？
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【中文标题】当单个字段是 GROUP BY 中的多个字段之一时，如何汇总该字段的数据？【英文标题】：How do you summarize data for a single field when it is one of multiple fields in GROUP BY? 【发布时间】：2017-08-07 18:42:38 【问题描述】：我有一张如下所示的表格：
| loc_id | pilot_ind | last_form_step_completed |
|--------|-----------|--------------------------|
| 9988 | non-pilot | 1 |
| 9988 | non-pilot | 1 |
| 9988 | non-pilot | 2 |
| 9988 | non-pilot | 2 |
| 9988 | non-pilot | 2 |
| 9988 | non-pilot | 3 |
| 9988 | non-pilot | 3 |
| 9988 | non-pilot | 4 |
| 9988 | non-pilot | 4 |
| 1122 | non-pilot | 1 |
| 1122 | non-pilot | 2 |
| 1122 | non-pilot | 2 |
| 1122 | non-pilot | 2 |
| 1122 | non-pilot | 3 |
| 1122 | non-pilot | 4 |
| 1122 | non-pilot | 5 |
| 5544 | pilot | 1 |
| 5544 | pilot | 1 |
| 5544 | pilot | 2 |
| 5544 | pilot | 2 |
| 5544 | pilot | 2 |
| 5544 | pilot | 3 |
| 5544 | pilot | 3 |
| 5544 | pilot | 4 |
| 5544 | pilot | 4 |
| 5544 | pilot | 5 |
| 5544 | pilot | 5 |
| 5544 | pilot | 5 |
| 5544 | pilot | 5 |
| 5544 | pilot | 5 |
| 3344 | pilot | 1 |
| 3344 | pilot | 2 |
| 3344 | pilot | 2 |
| 3344 | pilot | 3 |
| 3344 | pilot | 3 |
| 3344 | pilot | 3 |
| 3344 | pilot | 4 |
| 3344 | pilot | 4 |
| 3344 | pilot | 4 |
| 3344 | pilot | 5 |
| 3344 | pilot | 5 |
| 3344 | pilot | 5 |
我需要这样总结：
| pilot_ind | last_step_compl | total_count | total_per_pilot_ind | pct_pilot_ind_total |
|-----------|-----------------|-------------|---------------------|---------------------|
| non-pilot | 1 | 3 | 16 | 18.8% |
| non-pilot | 2 | 6 | 16 | 37.5% |
| non-pilot | 3 | 3 | 16 | 18.8% |
| non-pilot | 4 | 3 | 16 | 18.8% |
| non-pilot | 5 | 1 | 16 | 6.3% |
| pilot | 1 | 3 | 26 | 11.5% |
| pilot | 2 | 5 | 26 | 19.2% |
| pilot | 3 | 5 | 26 | 19.2% |
| pilot | 4 | 5 | 26 | 19.2% |
| pilot | 5 | 8 | 26 | 30.8% |
我无法在 total_per_pilot_ind 字段中获取 Pilot_ind 的分组总计 - 我尝试使用 OVER (PARTITION BY)，但结果不正确，因为 GROUP BY 子句中有两个字段。 这里是示例数据和当前尝试的链接：http://rextester.com/PCE62786
select
r.pilot_ind
,r.last_form_step_completed
,count(*) total_count
,count(*) over ()
from
results r
group by
r.pilot_ind
,r.last_form_step_completed
order by 1,2
编辑： 有没有办法在一个查询中做到这一点？
【问题讨论】：
在您的示例中如何计算total_per_pilot_ind 列中的16 和26 值？
我已编辑帖子以包含整个表格。表格和数据也可以在 rextester 链接中找到。 total_per_pilot_ind 是针对 Pilot_ind 字段（飞行员或非飞行员）的每个值的所有行的计数。通过扩展，pct_pilot_ind_total 计算为 (total_count / total_per_pilot_ind)。
【参考方案1】：
使用子查询：
SELECT *,
sum(total_count) over(partition by pilot_ind) As total_per_pilot_ind,
round(100.0 * total_count / sum(total_count) over(partition by pilot_ind) ,1)
as pct_pilot_ind_total
FROM (
select
r.pilot_ind
,r.last_form_step_completed
,count(*) total_count
from
results r
group by
r.pilot_ind
,r.last_form_step_completed
) x
order by 1,2
演示：http://sqlfiddle.com/#!17/0f411/5
【讨论】：
【参考方案2】：你可以使用左连接
select
t.pilot_ind
, t.last_form_step_completed
, sum(a.last_form_step_completed) total_count
from (
select distinct pilot_ind, last_form_step_completed
from my_table ) t
left join my_table a on t.pilot_ind = a.pilot_ind
and t.last_form_step_completed = a.last_form_step_completed
group by t.pilot_ind
, t.last_form_step_completed
（不清楚您如何获得示例中的最后两列..所以我省略了它们）
【讨论】：
【参考方案3】：select a.pilot_id, a.last_step, a.total_count, b.total_per_pilot_ind,
(a.total_count/ b.total_per_pilot_ind)*100 as Per_tage
from
(
select pilot_ind, last_form_step_completed as last_step, count(*) as total_count
from table1
group by pilot_ind, last_form_step_completed
) a,
(
select pilot_ind, sum(last_form_step_completed) as total_per_pilot_ind
from table1
group by pilot_id
) b
where a.pilot_ind=b.pilot_ind
【讨论】：
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