请各位大神帮忙解答。

[fy6313156]

假设有A表 B表
code name code name
1 a 1 aaa
2 b 3 ccc
3 c 5 eee
4 d
5 e
现在我想参照B表将A表更新为
code name
1 aaa
2 b
3 ccc
4 d
5 eee
请各位大神帮帮忙，用一条SQL语句搞定。

[shoppo0505]

update a set name = b.name from b inner join code = b.code

[發糞塗牆]

----------------------------------------------------------------
-- Author  :DBA_Huangzj(發糞塗牆)
-- Date    :2013-12-24 07:42:52
-- Version:
--      Microsoft SQL Server 2012 (SP1) - 11.0.3128.0 (X64) 
--	Dec 28 2012 20:23:12 
--	Copyright (c) Microsoft Corporation
--	Enterprise Edition (64-bit) on Windows NT 6.2 <X64> (Build 9200: )
--
----------------------------------------------------------------
--> 测试数据：[A]
if object_id('[A]') is not null drop table [A]
go 
create table [A]([code] int,[name] varchar(3))
insert [A]
select 1,'a' union all
select 2,'b' union all
select 3,'c' union all
select 4,'d' union all
select 5,'e'
--> 测试数据：[B]
if object_id('[B]') is not null drop table [B]
go 
create table [B]([code] int,[name] varchar(3))
insert [B]
select 1,'aaa' union all
select 3,'ccc' union all
select 5,'eee'
--------------开始查询--------------------------

--查询
select ISNULL(a.code,b.code)code,ISNULL(b.NAME,a.NAME)name
from [A] LEFT JOIN [B] ON a.code=b.code

--更新
UPDATE a
SET a.NAME=isnull(b.NAME,a.NAME)
from [A] LEFT JOIN [B] ON a.code=b.code
SELECT * FROM a

----------------结果----------------------------
/* 

code        name
----------- ----
1           aaa
2           b
3           ccc
4           d
5           eee
*/

[lzw_0736]

UPDATE a SET NAME=b.NAME
from a
JOIN b ON a.code=b.code

[LongRui888]

试试这个：

update a
set name = b.name
from b
where a.code = b.code

[t101lian]

update a set name=b.name
from a
JOIN b ON a.code=b.code

[fy6313156]

最后能用一条SQL语句就能完成。