SQL Server - 将天数转换为列，小时为行

Question

我正在寻找一种方法来转换行以显示日期时间数据的一天作为列和小时在一个月中的第一行。 这是在一个月内我的示例数据：

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 | 

如何建立结果呢？

Answer 1

您可以使用Conditional Aggregate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)