多表查询问题

Question

select * 
from Tb1 t1
where not exists(select * 
                   from Tb2 t2 
                  where t1.id=t2.id
                    and t1.name=t2.name
                    and t1.add=t2.add);

Answer 1

select * 
from Tb1 t1
where not exists(select * 
                   from Tb2 t2 
                  where t1.id=t2.id
                    and t1.name=t2.name
                    and t1.add=t2.add)
  and not exists(select * 
                   from Tb3 t3 
                  where t1.id=t3.id
                    and t1.name=t3.name
                    and t1.add=t3.add)
这样行不行啊？

Answer 2

select * from tb1 where not exists (select * from tb2 where tb1.id=tb2.id )
union 
select * from tb1 where not exists(select * from tb3 where tb1.id=tb3.id )