删除记录的前缀

--建表



SET ANSI_NULLS ON

GO

SET QUOTED_IDENTIFIER ON

GO

IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[Table_1]') AND type in (N'U'))

BEGIN

CREATE TABLE [dbo].[Table_1](

	[ID] [int] IDENTITY(1,1) NOT NULL,

	[UserName] [nvarchar](50) NULL,

 CONSTRAINT [PK_Table_1] PRIMARY KEY CLUSTERED 

(

	[ID] ASC

)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]

) ON [PRIMARY]

END

go



--插入测试数据



insert into [Table_1]([UserName])values('asd_1');

insert into [Table_1]([UserName])values('asd_2');

insert into [Table_1]([UserName])values('asd_3');

insert into [Table_1]([UserName])values('a阿斯顿sd_4');

insert into [Table_1]([UserName])values('asd_5');

insert into [Table_1]([UserName])values('6');

insert into [Table_1]([UserName])values('as阿斯顿飞d_7');

insert into [Table_1]([UserName])values('asd_8');



--查看数据

select * from table_1



--更新每次修改的数据

update table_1 set UserName='asd_1' where id=1;

update table_1 set UserName='asd_2' where id=2;

update table_1 set UserName='asd_3' where id=3;

update table_1 set UserName='a阿斯顿sd_4' where id=4;

update table_1 set UserName='asd_5' where id=5;

update table_1 set UserName='6' where id=6;

update table_1 set UserName='as阿斯顿飞d_7' where id=7;

update table_1 set UserName='asd_8' where id=8;



--采用stuff删除记录的前缀

update table_1 set UserName=stuff(UserName,1,charindex('_',UserName),'')

--采用substring删除记录的前缀

update table_1 set UserName=substring(UserName,charindex('_',UserName)+1,len(UserName));

--采用replace删除记录的前缀

update table_1 set UserName=replace(UserName,substring(UserName,1,charindex('_',UserName)),'');