SQL 服务器 - 将天转换为列，将小时转换为行

Question

我正在寻找一种方法来转换行以将日期时间数据的日期显示为列，将小时显示为一个月中的第一行。这是我一个月的示例数据：

Time                   | Value
--------------------------------
2016-10-01 00:00:00    | 23
2016-10-01 00:30:00    | 35
.....                  | .....
2016-10-31 23:30:00    | 52

我想要的结果是

Time          |   1   | .... |   31   |  <-- Day 1 - 31
---------------------------------------
00:00:00      |  23   | .... |  ....  |
00:30:00      |  35   | .... |  ....  |
...           | ....  | .... |  ....  |
23:30:00      | ....  | .... |   52   |

我如何构建结果？

Answer 1

您可以使用 Conditional Aggregate 来做到这一点

select cast([Time] as time),
       Max(case when DAY([Time]) = 1 then Value end) As [1]
       Max(case when DAY([Time]) = 2 then Value end) As [2]
       Max(case when DAY([Time]) = 3 then Value end) As [3]
       .....
       Max(case when DAY([Time]) = 31 then Value end) As [31]
From yourtable
Where Month([Time]) = 10 -- pass the required month  
Group by cast([Time] as time)

SQL 服务器 - 将天转换为列，将小时转换为行

SQL Server - Convert Days as Column, Hour as row

sql

sql-server

sql-server-2016