SQL数据旋转的问题

表A

uaserid uaserid1 uaserid2 uaserid3
1 34 5

表B为空表，如何获得表A的数据插入表B，最终结果是

id
3
4
5

解决方法:

if object_id('[A]') is not null drop table [A]
go
create table [A]([uaserid] int,[uaserid1] int,[uaserid2] int,[uaserid3] int)
insert [A]
select 1,3,4,5
if object_id('[B]') is not null drop table [B]
go
create table [B]([id] int)

insert into b(id)
select uaserid1 from A
union all
select uaserid2 from A
union all
select uaserid3 from A

select * from [B]

--测试结果:
/*
id          
----------- 
3
4
5

（所影响的行数为 3 行）
*/