QoQ without a commond id

Hi All,

I use this technique for QoQ when I have a commond key:

How to do an OUTER JOIN in Query of Queries | BealeARTS

Now, I have data from two different table but the join is based on multiple fields as:

select *

from tableA, tableB

where tableA.field1 = tableB.field1

and tableA.field2 = tableB.field2

and tableA.field3 = tableB.field3

How can I do the other join in this case?

Thanks in advanced.