I have thought about this for days now (and nights) and I have simplified my problem below. (I even bought a book)
I have three tables: 1, 2 and 3.
Table 1 = a, b and c
Table 2 = x, y and z
Table 3 combines table 1 and table 2; ax, ay, az, bx, by, bz, etc.
Table 1 and Table 2 are both One to...