Question

我真的希望有人可以帮我解决这个棘手的问题。

我有一个不断接收数据的表（如数据日志）该表正在接收数据24 * 7。可以有很多记录。小时和许多名称A，B，C，D等。

表格RAW

LogTime               Name   Value  
2015-05-16 00:29:00     A       03  
2015-05-16 00:48:00     A       15      
2015-05-16 00:29:00     B       30  
2015-05-16 00:35:00     B       32  
2015-05-16 00:59:00     B       66          
2015-05-16 01:25:11     A       88  
2015-05-16 01:52:00     A       100  
2015-05-16 01:26:45     B       5  
2015-05-16 01:57:00     B       51

午夜后的每一天，我都希望运行一个可以追溯到前一天的程序 XXXX-XX-XX 00:00:00到XXXX-XX-XX 23:59:59。取每个名称的MAX值，按小时分组，并将结果插入另一个表格，格式如下

表格结果

TimeByHouer            Name     Value  
2015-05-08 01:00:00      A         15  
2015-05-08 01:00:00      B         66  
2015-05-08 02:00:00      A         100  
2015-05-08 02:00:00      B         51

Answer 1

尝试此查询：

declare @t table(logtime datetime, name char(1), value int)
insert into @t(logtime, name, value) values
('2015-05-16 00:29:00', 'A', 3),
('2015-05-16 00:48:00', 'A', 15),
('2015-05-16 00:29:00', 'B', 30),  
('2015-05-16 00:35:00', 'B', 32), 
('2015-05-16 00:59:00', 'B', 66),    
('2015-05-16 01:25:11', 'A', 88), 
('2015-05-16 01:52:00', 'A', 100), 
('2015-05-16 01:26:45', 'B', 5),
('2015-05-16 01:57:00', 'B', 51)

; with Hs(TimeByHouer, name, value) as (
Select H = DATETIMEFROMPARTS(DATEPART(YEAR, logtime), DATEPART(MONTH, logtime), DATEPART(DAY, logtime), DATEPART(HOUR, logtime), 0, 0, 0)
, name, value From @t
)
Select TimeByHouer, name, Max(value) From Hs Group By TimeByHouer, name
Order By TimeByHouer, name

2012年你也可以使用：

Select DATEADD(HOUR, DATEPART(HOUR, logtime), cast(cast(logtime as date) as datetime))

将数据从原始数据表分组到另一个基于om的最大值pr。厚而

1 个答案: