Question

我在这里阅读了很多文章，试图弄清楚如何使用此透视功能，但没有运气。某些解释中有些对我来说是不必要的，或者由于我只是最近才开始自学SQL而变得难以理解。

我需要弄清楚如何将我的日期分组为一个日期，然后将P1，P2，P3 ...分成几列。最重要的是将P1-10放在每个单独的列中。

这就是原始SQL Server的样子。.+许多其他列与我要执行的操作无关。

+-------------+------------+---------------------+
| StationName | Start_Time | Time                |
+-------------+------------+---------------------+
| P1          | 15         | 2018-06-21 13:37:34 |
+-------------+------------+---------------------+
| P3          | 69         | 2018-06-21 12:33:55 |
+-------------+------------+---------------------+
| P4          | 52         | 2018-06-21 13:42:34 |
+-------------+------------+---------------------+
| P1          | 18         | 2018-06-21 10:37:34 |
+-------------+------------+---------------------+
| P9          | 78         | 2018-06-21 6:37:34  |
+-------------+------------+---------------------+

This is what I currently have

SELECT Cast(Start_Time AS DATE) AS Date, 
StationName, 
sum(time) AS "Daily Downtime"
FROM A6K_Events
Where StationName Like 'P%'
GROUP BY Cast(Start_Time AS DATE), StationName
Order By Date DESC


+------------+-------------+----------------+
| Date       | StationName | Daily Downtime |
+------------+-------------+----------------+
| 2018-06-21 | P1          | 33             |
+------------+-------------+----------------+
| 2018-06-21 | P3          | 62             |
+------------+-------------+----------------+
| 2018-06-21 | P8          | 1              |
+------------+-------------+----------------+
| 2018-06-21 | P9          | 78             |
+------------+-------------+----------------+
| 2018-06-20 | P1          | 69             |
+------------+-------------+----------------+
| 2018-06-19 | P1          | 52             |
+------------+-------------+----------------+


This is what I would like to have:
+------------+----+----+----+----+----+----+----+----+----+-----+
| Date       | P1 | P2 | P3 | P4 | P5 | P6 | P7 | P8 | P9 | P10 |
+------------+----+----+----+----+----+----+----+----+----+-----+
| 2018-06-21 | 33 |    | 62 |    |    |    |    | 1  | 78 |     |
+------------+----+----+----+----+----+----+----+----+----+-----+
| 2018-06-20 | 69 |    |    |    |    |    |    |    |    |     |
+------------+----+----+----+----+----+----+----+----+----+-----+
| 2018-06-19 | 52 |    |    |    |    |    |    |    |    |     |
+------------+----+----+----+----+----+----+----+----+----+-----+

填写的数字将是当天该进程的“每日停机时间”值。最终结果将被实时记录，并包含许多日期和各种停机时间。

谢谢您的帮助

已编辑以添加文本表和删除图像

Answer 1

您可以使用以下数据透视表语句完成输出。

SELECT * FROM(
SELECT CAST([Start_Date] AS DATE) as [DATE],SUM(TIME) AS [Daily DownTime],STATIONNAME FROM A6K_Events Where StationName Like 'P%' GROUP BY [start_date],STATIONNAME 
) AS S
PIVOT(sum([Daily DownTime]) FOR STATIONNAME IN([P1],[P2],[P3],[P4],[P5],[P6],[P7],[P8],[P9],[P10])) AS PT

http://rextester.com/BAXY34111

SQL Server如何在这种困难的情况下利用数据透视

1 个答案: