这里,似乎像它应该为你工作的方式。
一些假设:
- 我想重复的是不包括ID的实际行重复,根据您提供1秒条款。如果不是这种情况...删除分区的部分
row_number()
窗口函数,它将改变行为
- 这将删除递归重复项。也就是说,如果3,4,甚至15排在彼此的一秒钟内,它保持1
- 这应该不论工作,如果第一行或最后一行是重复
下面的代码。取消注释了两行在表中看到的变化
declare @table table(id int, var1 int, var2 int, var3 int, date datetime2)
insert into @table
values
--(0,1,2,3,'2001-01-01 00:01:01.456'),
(1,1,2,3,'2001-01-01 01:01:01.456'), --dupe of 1/2/3
(2,1,2,3,'2001-01-01 01:01:02.214'), --dupe of 1/2/3
(3,1,2,3,'2001-01-01 01:01:02.234'), --dupe of 1/2/3
(4,1,2,3,'2001-01-01 01:01:02.244'), --dupe of 1/2/3
(5,1,2,3,'2001-01-01 01:01:04.789'), --dupe of 4/5
(6,1,2,3,'2001-01-01 01:01:04.989'), --dupe of 4/5
--(7,1,2,3,'2001-01-01 01:01:06.789'), --dupe of 6/7
(8,1,2,3,'2001-01-01 01:01:06.799') --dupe of 6/7
--apply the sequence
;with cte as(
select
*,
ROW_NUMBER() over (partition by var1, var2, var3 order by date) as RN --just in case... change this to just order by id, date if need be and remove the partition
from
@table),
--get first/most of the batch to remove
cte2 as(
select
c1.*
,c2.RN as RowsToRemove
from cte c1
left join
cte c2 on c1.RN < c2.rn and
datediff(second,c1.date,c2.date) < 1),
--remove the rows identified in the above cte
cte3 as(
select distinct
ID,
var1,
var2,
var3,
date,
RN
from cte2
where
RN not in (select distinct isnull(RowsToRemove,0) from cte2)),
--add another sequence. This is necessary for first/last row check for duplicate
cte4 as(
select
f.*,
row_number() over (partition by var1, var2, var3 order by date) RN2
from
cte3 f)
--return the results
select
f.ID,
f.var1,
f.var2,
f.var3,
f.date
from
cte4 f
left join
cte4 d on d.RN = f.RN - 1
where isnull(datediff(second,d.date,f.date),500) > 1
退货
+----+------+------+------+-----------------------------+
| ID | var1 | var2 | var3 | date |
+----+------+------+------+-----------------------------+
| 1 | 1 | 2 | 3 | 2001-01-01 01:01:01.4560000 |
| 5 | 1 | 2 | 3 | 2001-01-01 01:01:04.7890000 |
| 8 | 1 | 2 | 3 | 2001-01-01 01:01:06.7990000 |
+----+------+------+------+-----------------------------+
什么,如果有对方的第二个中的三个记录......只保留1?并且ID只是一个PK,这意味着var1,var2和var3应该被认为是重复的?即如果它们不相同,那么它不是重复的? – scsimon
@scsimon是的。所有记录var1,2和3是相同的,日期在1秒内,只能保留1条记录。如果在该范围内有2个或200个,则无关紧要。 Id是PK。 – RossD
感谢@RossD的澄清。我刚刚编辑了我的答案,我*瘦*它应该在所有情况下工作。让我知道如果它不。为了清晰起见,我将它放在多个cte中。 – scsimon