我研究过它,我找到的最实用的方法是创建一个程序。程序
添加一个id,删除重复的行,最后将一个id列添加到新形成的表中。我想知道,必须有一个更简单的方法。这是代码,它有效...
- 我的桌子
create table dublicateTable
(
name varchar(30)
)
- 重复插入的行
insert into dublicateTable values('Kerem')
insert into dublicateTable values('Taner')
insert into dublicateTable values('Mehmet')
insert into dublicateTable values('Serhat')
- 第一种情况
select * from dublicateTable
name
-----
Kerem
Kerem
Kerem
Taner
Taner
Mehmet
Mehmet
Mehmet
Mehmet
Serhat
Serhat
Serhat
- 动态形成sql代码程序
USE [myDataBase]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
create procedure [dbo].[usp_delete_duplicate]
as
declare
@add_id_text nvarchar(50),
@delete_id_text nvarchar(50),
@command_text nvarchar(100)
begin
set @add_id_text='alter table dbo.dublicateTable add id int identity(1,1)'
set @command_text='delete from dbo.dublicateTable where id not in(select min(id) from dbo.dublicateTable group by name)'
set @delete_id_text='alter table dbo.dublicateTable drop column id'
exec sp_executesql @add_id_text
exec sp_executesql @command_text
exec sp_executesql @delete_id_text
exec sp_executesql @add_id_text
end
- 最终的情况。工作..
exec usp_delete_duplicate
select id,name from dublicateTable
id name
--- ----
1 Kerem
2 Taner
3 Mehmet
4 Serhat
答案 0 :(得分:3)
CTE可以使编写更加简单。
;with cte as (
select
name,
row_number() over (partition by name order by name) row
from
dublicateTable
)
delete from cte where row > 1