如何在SQL Server中按日期從表中選擇多個最大行

我需要選擇每天有max(batchid)的行。如何在SQL Server中按日期從表中選擇多個最大行

樣品表：

Id | BatchId |Date     |KeyValue 
-- | --------|---------------------|----------- 
1 | 1  | 2016-12-13 12:30:66 |1234 
2 | 1  | 2016-12-13 12:30:66 |5654 
3 | 2  | 2016-12-13 08:30:66 |1234 
4 | 2  | 2016-12-13 08:30:66 |5654 
5 | 1  | 2016-12-12 12:10:45 |1234 
6 | 1  | 2016-12-12 12:10:45 |5634 
7 | 2  | 2016-12-12 08:10:45 |1234 
8 | 2  | 2016-12-12 08:10:45 |5634 
9 | 3  | 2016-12-12 04:10:45 |9628

預期輸出：

Id | BatchId |Date     |KeyValue 
-- | --------|---------------------|----------- 
3 | 2  | 2016-12-13 08:30:66 |1234 
4 | 2  | 2016-12-13 08:30:66 |5654 
9 | 3  | 2016-12-12 04:10:45 |9628

提前感謝！

來源

2016-12-13 rsk

你說的每一天，然後你的輸出有兩個2016-12-13？你也應該告訴我們你到目前爲止嘗試過什麼...... – Anand

@SqlZim它確實...... 2016-12-13'中的兩行有batchId = 2，只有一行的最大bacthId = 3對於'2016- 12-12' –

歡迎來到StackOverflow！檢查[問]提出問題的提示。在這種情況下，@Anand說，最好提供一些你已經嘗試過的代碼，因爲這是一個問答網站，而不是代碼對我的服務。 – Kateract

使用max() over . . .：

select t.* 
from (select t.*, max(date) over (partition by cast(date as date)) as maxdate 
     from sample t 
    ) t 
where maxdate = date;

或者，rank()/dense_rank()：

select t.* 
from (select t.*, 
      dense_rank() over (partition by cast(date as date) order by date desc) as seqnum 
     from sample t 
    ) t 
where seqnum = 1;

來源

2016-12-13 19:55:12

Sql Server允許'cast（date as date）'？ –

校正和戈登·利諾夫的擴張：

rextester：http://rextester.com/GECAZ46515

create table BatchKeys (Id int,BatchId int,Date datetime,KeyValue int) 
insert into BatchKeys (Id,BatchId,Date,KeyValue) values 
(1,1,'2016-12-13T12:30:06',1234) 
,(2,1,'2016-12-13T12:30:06',5654) 
,(3,2,'2016-12-13T08:30:06',1234) 
,(4,2,'2016-12-13T08:30:06',5654) 
,(5,1,'2016-12-12T12:10:45',1234) 
,(6,1,'2016-12-12T12:10:45',5634) 
,(7,2,'2016-12-12T08:10:45',1234) 
,(8,2,'2016-12-12T08:10:45',5634) 
,(9,3,'2016-12-12T04:10:45',9628) 


select t.* 
from (select t.*, max(BatchId) over (partition by cast(date as date)) as maxBatchId 
     from BatchKeys t 
    ) t 
where maxBatchId = BatchId; 

select t.* 
from (select t.*, 
      dense_rank() over (partition by cast(date as date) order by BatchId desc) as seqnum 
     from BatchKeys t 
    ) t 
where seqnum = 1; 

select top 1 with ties t.* 
from BatchKeys t 
order by dense_rank() over (partition by cast(date as date) order by BatchId desc)

來源

2016-12-13 20:19:00 SqlZim

如何在SQL Server中按日期從表中選擇多個最大行

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