利用row_number函数处理重复数据

 

利用 row_number 函数处理重复数据

 

-- 创建测试表 person

CREATE TABLE person(

    sn varchar(10),

    name varchar(50)

);

go

 

-- 插入测试重复数据

insert into person values('1','guoqiang1');

insert into person values('1','guoqiang1');

insert into person values('1','guoqiang1');

insert into person values('2','guoqiang2');

insert into person values('2','guoqiang2');

insert into person values('3','guoqiang3');

go

 

-- 查看 person 表

select * from dbo.person;

go

 

-- 去除重复数据，并放到 tmp 表中

select sn,name into tmp from

( select *, row_number() over(partition by sn order by sn) as rank from person) as t

where t.rank = 1

go

 

-- 查看 tmp 表

select * from dbo.tmp

go