如何在两个层面上旋转

Question

我正在使用 SQL Server 2012 并尝试根据下表从 TSQL 构建一个数据透视表，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

从此表格中，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 |

我有以下代码成功地在“优先级”级别上进行透视。

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

我怎样才能让这个查询像我粘贴的第二个表一样在两个级别上进行旋转？ 任何帮助将不胜感激。

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;

Answer 2

我会试一试：

WITH PivotData AS
(
    SELECT
        Department
        , Priority + '_' + Impact AS PriorityImpact
        , Incident_ID
    FROM
        <table>
)
SELECT
    Department
    , Normal_Low
    , Normal_Medium
    ,...
FROM
PivotData
PIVOT (COUNT(Incident_ID FOR PriorityImpact IN (<Listing all the PriorityImpact values>) ) as P;