数据库中 把A表中的a字段和b字段数据 复制到B表中的aa字段和bb字段?

数据库中 把A表中的a字段和b字段数据 复制到B表中的aa字段和bb字段
如何写语句呢???

如果你存在ab表，那么需要用insert into，如果不存在b表，那么用select * into

DB Code(sqlserver2005)

if not exists (select * from sysobjects where name='tab1')
begin
create table tab1
(
id int primary key identity(1,1),
column1 varchar(20),
column2 varchar(20)
)
end

Go

if not exists (select * from tab1)
begin
declare @number int,@strNumber varchar(10)
set @number=1
while @number<=10
begin
set @strNumber=ltrim(str(@number))
insert into tab1 values ('column1-Data'+@strNumber,'column2-Data'+@strNumber)
set @number=@number+1
end
end

Go
select * from tab1

Go

if not exists(select * from sysobjects where name='tab2')
begin
select column1,column2 into tab2 from tab1
end

else
begin
insert into tab2 (column1,column2) select column1,column2 from tab1
end

insert into b表(aa,bb) select a,b from a

update a set a.bb = b.aa from a,b where a.[关联字段] = b.[关联字段]