Question

我在表格中有大约一百万行数据。我想删除最后3行的每5行。

示例：

Row1
Row2
Row3
Row4
Row5
Row6
Row7
Row8
Row9
Row10

删除后，它应如下所示：

Row1
Row2
Row6
Row7

我该怎么做？

Answer 1

这应该这样做，但您需要在order by中指定一些列。并且应该有一些其他规则来删除这些记录。

DROP TABLE _test
GO
create table _test
(id int identity(1,1)
 ,x int 
)
GO
insert into _test(x)
select 1
go 50


;with cte as (
    select [rwn] = row_number() over(partition by 1 order by id)
    from _test
)
delete from cte 
where 1=1
    and rwn%5 not in (1,2)

select * from _test

Answer 2

使用此声明。它是作品

delete from temp12  where Reg_No in (select Reg_No from  
(select Reg_No,Name, Row_number() over (order by reg_no) abc from temp12 )
 where  abc  like '%3' or abc like '%4' or abc like '%5' or abc like '%8' or abc like '%9'  or abc like '%0')

通过查询删除SQL中的行

2 个答案: