请教高手，我想找出多个数据表中的相同数据，SQL语句怎么写？
就是多个数据表里，有相同的数据，要全部查找出来，SQL语句怎么写？先谢了！


------解决方案--------------------
where A.col1=B.col1 and A.col2=B.col2 and A.col3=B.col3 and ...
------解决方案--------------------
select col1,col2,col3
from (
select * from tab1
union all
select * from tab2
union all
select * from tab3
) t
group by col1,col2,col3
having count(*)>1