Question

我正在寻找一种方法来转换行以显示日期时间数据的日期作为列和小时作为一个月的第一行。这是我一个月内的示例数据：

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   |

我如何建立结果？

Answer 1

您可以使用Conditional Aggregate执行此操作

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 Server - 将天数转换为列，将小时转换为行

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