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国家单位 1,1,1,1 1 1 1 张三 11
国家单位 1,1,1,1 1 1 1 李四 11
北京市单位 1 1 1 1 李四 11
各省、自治区、直辖市和计划单列市 1 1 1 1 张三 11
各省、自治区、直辖市和计划单列市 1 1 1 1 李四 11
dddddd 1 1 1 1 1 1 1 1 张三 11
dddddd 1 1 1 1 1 1 1 点点滴滴 11
ddddddddddd 1 1 1 1 1 1 1 1 张三 11
ddddddddddd 1 1 1 1 1 1 1 1 李四 11
ddddddddddd 1 1 1 1 1 1 1 李四 11
select
case px when 1 then col1 else '' end as col1,
case px when 1 then col2 else '' end as col2,
*
from
(select px=row_Number()over(partition by col1,col2 order by getdate()),* from tb)t
select
case px when 1 then col1 else '' end as col1,
case px when 1 then col2 else '' end as col2,
*
from
(select px=row_Number()over(parition by col1,col2 order by getdate()),* from tb)t
--2005 以及以上版本
with t as
(
select row_number() over(partition by 字段 order by 字段) as new_id ,* from tb
)
delete from t where new_id>1
if object_id('Tempdb..#') is not null
drop table #
Select distinct * into # from #T--排除重复记录结果集生成临时表#
truncate table #T--清空表
insert into #T select * from # --把临时表#插入到表#T中
--查看结果
select * from #T
删除重复记录没有大小关系时,处理重复值
--> --> (Roy)生成測試數據
if not object_id('Tempdb..#T') is null
drop table #T
Go
Create table #T([Num] int,[Name] nvarchar(1))
Insert #T
select 1,N'A' union all
select 1,N'A' union all
select 1,N'A' union all
select 2,N'B' union all
select 2,N'B'
Go
方法1:
if object_id('Tempdb..#') is not null
drop table #
Select distinct * into # from #T--排除重复记录结果集生成临时表#
truncate table #T--清空表
insert #T select * from # --把临时表#插入到表#T中
--查看结果
select * from #T
/*
Num Name
----------- ----
1 A
2 B
(2 行受影响)
*/
--重新执行测试数据后用方法2
方法2:
alter table #T add ID int identity--新增标识列
go
delete a from #T a where exists(select 1 from #T where Num=a.Num and Name=a.Name and ID>a.ID)--只保留一条记录
go
alter table #T drop column ID--删除标识列
--查看结果
select * from #T
/*
Num Name
----------- ----
1 A
2 B
(2 行受影响)
*/
--重新执行测试数据后用方法3
方法3:
declare Roy_Cursor cursor local for
select count(1)-1,Num,Name from #T group by Num,Name having count(1)>1
declare @con int,@Num int,@Name nvarchar(1)
open Roy_Cursor
fetch next from Roy_Cursor into @con,@Num,@Name
while @@Fetch_status=0
begin
set rowcount @con;
delete #T where Num=@Num and Name=@Name
set rowcount 0;
fetch next from Roy_Cursor into @con,@Num,@Name
end
close Roy_Cursor
deallocate Roy_Cursor
--查看结果
select * from #T
/*
Num Name
----------- ----
1 A
2 B
(2 行受影响)
*/