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a+b+d - PK
How I can relation this tables with use (a+b)?
Sorry for my english
I would create a parent table with A and B as elements of its primary key. I would create table 1 as a dependant child of the parent with C as part of its PK, and table 2 as a dependant child of the parent with D as part of its Pk.
yes... do look for the possibility that when designing databases, the physical model doesn't necessary follow from the logical model...
in some cases, a mapping/relation/linking table (as shown by Pat) is necessary in the physical model [to fulfill the relation requirements in the logical model]
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