SQL Server中最新的两个日期时间

我有下表

CREATE TABLE [dbo].[events]
(
    [event_id] [nvarchar](50) NULL,
    [event_timestamp] [datetime] NULL,
    [reading] [int] NULL
) ON [PRIMARY]

使用以下数据和结果

表：活动

结果应该是

所需结果：

event_id    event_timestamp    Reading
--------------------------------------
1200        14-Jun-15          1500
1200        13-Jun-15          1430.7
1330        14-Jun-15          1490
1330        13-Jun-15          1300
1347        14-Jun-15          2700
1347        13-Jun-15          2400

具有行数功能：

with cte as(select *, row_number() over(partition by event_id 
                         order by event_timestamp desc) rn from events)
select * from cte where rn <= 2

---

@Giorgi Nakeuri，非常感谢你的帮助，我知道了

with cte as(select itemid, dt, info, row_number() over(partition by itemid order by dt desc) rn 
from (SELECT itemid, dt, MAX(info) info from(
SELECT event_item_id itemid,CONVERT(VARCHAR, event_timestamp, 111) dt, Reading info
FROM dbo.events WHERE CONVERT(VARCHAR, event_timestamp, 111) IN (  
SELECT Distinct(CONVERT(VARCHAR, event_timestamp, 111))FROM dbo.events 
WHERE Reading !='0.000000')
) tbl1 GROUP BY itemid, dt
) tbl)
select * from cte where rn <= 2 ORDER BY itemid DESC, dt DESC

---

使用cte asselect itemid，dt，info，row_number overpartition by itemid order by dt desc rn from SELECT itemid，dt，MAXinfo info from SELECT event_item_id itemid，CONVERTVARCHAR，event_timestamp，111 dt，event_additional_info from dbo.events其中CONVERTVARCHAR，event_timestamp，111 IN SELECT DistinctCONVERTVARCHAR，event_timestamp，111来自dbo.events，其中event_附加信息！='0.000000“tbl1按项目ID分组，dt tbl从cte中选择*，其中rn

with cte as(select itemid, dt, info, row_number() over(partition by itemid order by dt desc) rn 
from (SELECT itemid, dt, MAX(info) info from(
SELECT event_item_id itemid,CONVERT(VARCHAR, event_timestamp, 111) dt, Reading info
FROM dbo.events WHERE CONVERT(VARCHAR, event_timestamp, 111) IN (  
SELECT Distinct(CONVERT(VARCHAR, event_timestamp, 111))FROM dbo.events 
WHERE Reading !='0.000000')
) tbl1 GROUP BY itemid, dt
) tbl)
select * from cte where rn <= 2 ORDER BY itemid DESC, dt DESC