急救,请各位大侠赐教!

[fishidea]

表 A 如下:

cc name count
1 AA NULL
2 BB NULL
3 CC NULL
4 DD NULL


怎么能将count的值更新为 AA,BB,CC,DD ?

多谢大家指点,谢谢了~

[华夏小卒]

update a set count=name

[--小F--]

update tb set [count]=name

[jwdream2008]

update a set [count]=[name]

[pt1314917]

--> 测试数据: [A]
if object_id('[A]') is not null drop table [A]
create table [A] (cc int,name varchar(2),count varchar(20))
insert into [A]
select 1,'AA',null union all
select 2,'BB',null union all
select 3,'CC',null union all
select 4,'DD',null

declare @t varchar(100)
select @t=isnull(@t+',','')+name from a
update a set [count]=@t
select * from [A]

[nianran520]

--> 测试数据: [A]
if object_id('[A]') is not null drop table [A]
create table [A] (cc int,name varchar(2),count varchar(20))
insert into [A]
select 1,'AA',null union all
select 2,'BB',null union all
select 3,'CC',null union all
select 4,'DD',null

declare @str varchar(100)

select @str=isnull(@str+',','')+name from [A]

update A set [count]=@str

select * from [A]

[andysun88]

update A set count= name

[fishidea]

谢谢回复,不对噢~我要查询出来的count的值是 AA,BB,CC,DD,

按您现在的这样,count的值是等于name的,如下:
cc name count
1 AA AA
2 BB BB
3 CC CC
4 DD DD
这是错的

[J1985Z]

update a set count=name

[SQL77]

if object_id('[A]') is not null drop table [A]
create table [A] (cc int,name varchar(2),count varchar(20))
insert into [A]
select 1,'AA',null union all
select 2,'BB',null union all
select 3,'CC',null union all
select 4,'DD',null

declare @str varchar(100)

select @str=isnull(@str+',','')+name from [A]

update A set [count]=@str WHERE [COUNT] IS NULL

select * from [A]

[andysun88]

declare @strs varchar(500)
set @strs=''
select @strs = @strs +','+name from A12
print @strs

select A12.cc,A12.name,@strs as count from A12

[fishidea]

感谢SQL77与andysun88,结贴给分!^_^

[pt1314917]

[Quote=引用 7 楼 fishidea 的回复:]
谢谢回复,不对噢~我要查询出来的count的值是 AA,BB,CC,DD,

按您现在的这样,count的值是等于name的,如下:
cc name count
1  AA  AA
2  BB  BB
3  CC  CC
4  DD  DD
这是错的
[/Quote]
4、5楼早有正确答案了。。。