SQLSERVER 将两个表的字段并列起来

如何将两个表的字段并列起来?请看以下列子
A表:
col1
1
2
3
B表:
col2
A
B
C
结果:
col1 col2
1     A
2     B
3     C

实现代码：

select T1.col1,T2.col2 from 
(
select col1,row_number() over(order by col1) as row_num
from tb1
)T1,
(
select col2,row_number() over(order by col2) as row_num
from tb1
)T2
where T1.row_num = T2.row_num