SQL 分组获取产品 前两条记录

select * from
(
select *, ROW_NUMBER() over(partition by IPAddress order by recordtime desc) as rowNum
from MonitoringSystem
) A
where A.rowNum <= 1
order by A.IPAddress, A.recordtime desc

select * from MonitoringSystem
where RecordTime in
(
select  MAX(RecordTime) from MonitoringSystem
where IPAddress=@IPAddress
group by convert(varchar(16),RecordTime,120)
)
and RecordTime<=@CurrentTime
and RecordTime>=@PreTime
and IPAddress=@IPAddress
order by RecordTime asc

USE [SimCloudV3.1]
GO

/****** Object:  Table [dbo].[MonitoringSystem]    Script Date: 12/06/2013 17:36:58 ******/
SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

CREATE TABLE [dbo].[MonitoringSystem](
[ID] [nvarchar](50) NULL,
[CPU] [nvarchar](50) NULL,
[AvailableMemory] [nvarchar](50) NULL,
[TotalMemory] [nvarchar](50) NULL,
[RecordTime] [datetime] NULL,
[AddTime] [datetime] NULL,
[ChangeTime] [datetime] NULL,
[DNSName] [nvarchar](50) NULL,
[IPAddress] [nvarchar](50) NULL,
[NetWork] [nvarchar](50) NULL,
[SummaryState] [nvarchar](50) NULL
) ON [PRIMARY]

GO