表关联使用INNER JOIN实现更新功能

准备一些数据，创建2张表，表1为学生表：

 

create table [dbo].[student]
(
    [sno] int not null primary key,
    [name] nvarchar(10) not null,
    [performance] decimal(18,2) null
)

go

 

表2为学生成绩表：

 

接下来，我们为上面2张表添加一些数据，并查询数据结果：

 

insert into [dbo].[student]([sno],[name])
values  
(10001,n'甲'),
(10002,n'乙'),
(10003,n'丙'),
(10004,n'丁'),
(10005,n'戊'),
(10006,n'已'),
(10007,n'庚')
go

insert into [dbo].[performance]([sno],[score]) 
values 
(10002,320),
(10004,380),
(10001,424),
(10007,467),
(10005,300)
go

select * from [dbo].[student]
go

select * from [dbo].[performance]
go

 

以上均是为本篇所准备的数据。

 

把表2的字段[score]值更新至表1的[performance]。

 

update s
set s.[performance] = p.[score]
from [dbo].[student] as s
inner join [dbo].[performance] as p on(s.[sno] = p.[sno])
go

select * from [dbo].[student]
go