如何从两个层面出发

Question

我正在使用Server 2012，并试图根据下面的表从TSQL构建一个支点表，该表是通过连接多个表生成的。

INCIDENT ID | Department | Priority      | Impact 
--------------------------------------------
1           | IT         | Urgent        | High
2           | IT         | Retrospective | Medium   
3           | Marketing  | Normal        | Low
4           | Marketing  | Normal        | High
5           | Marketing  | Normal        | Med
6           | Finance    | Normal        | Med

在此表中，希望它以下列格式显示：

Priority     | Normal              | Urgent              | Retrospective       |
| Department | Low | Medium | High | Low | Medium | High | Low | Medium | High |
--------------------------------------------------------------------------------
| IT         |   1 |      1 |    0 |   1 |      1 |    0 |   1 |      1 |    0 |
| Finance    |   0 |      0 |    1 |   1 |      1 |    0 |   1 |      1 |    0 |
| Marketing  |   0 |      1 |    0 |   1 |      1 |    0 |   1 |      1 |    0 |

我有以下代码，它成功地转到了“优先级”级别。

SELECT *
FROM (
    SELECT 
        COUNT(incident.incident_id) OVER(PARTITION BY serv_dept.serv_dept_n) Total,
        serv_dept.serv_dept_n       Department,
        ImpactName.item_n           Impact,
        PriorityName.item_n         Priority    
    FROM --  ommitted for brevity
    WHERE  -- ommitted for brevity
) AS T

PIVOT (
    COUNT(Priority)
    FOR Priority IN ("Normal", "Urgent", "Retrospective")
) PIV
ORDER BY Department ASC

我如何才能让这个查询在两个层次上(如我粘贴的第二个表)进行枢轴操作？任何帮助都将不胜感激。

Answer 1

最简单的方法可能是条件聚合：

select department,
       sum(case when priority = 'Normal' and target = 'Low' then 1 else 0 end) as Normal_low,
       sum(case when priority = 'Normal' and target = 'Med' then 1 else 0 end) as Normal_med,
       sum(case when priority = 'Normal' and target = 'High' then 1 else 0 end) as Normal_high,
       . . .
from t
group by department;