合并字段sql求解 - MS-SQL Server / 应用实例

问题：
A表中有3个字段，分别是a1(varchar)，a2(int)，a3(char(3))
B表中有2个字段，分别是b1(varchar),b2(int)
需要将A表中的3个字段合并成一个字符串，写入到B表的b1字段，同时b2从1开始加1.

比如： A表中 a1 a2 a3
  F 21 WWW
  W 15 HHHH
  X 16 CCC
  B表应该是
  b1 b2
  F21WWW 1
  W15HHH 2
  X16CCC 3

多谢。
 

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SQL code:
insert into B(b1,b2)
select a1+rtrim(a2)+a3 , row_number() over (order by getdate())
from A

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SQL code:
select a1+ a2 +a3 as b1, identity(int,1,1) as b2 into #b
再
insert into b select * form #b

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SQL code:

--> 测试数据：[TA]
if object_id('[TA]') is not null drop table [TA]
create table [TA]([a1] varchar(1),[a2] int,[a3] varchar(4))
insert [TA]
select 'F',21,'WWW' union all
select 'W',15,'HHHH' union all
select 'X',16,'CCC'

select b1=a1+rtrim(a2)+a3,b2=Row_Number() over(order by a1) into TB
from [TA]

select * from T