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Step 1

Form the table:

R = [projSName(SUPPLIER/TYPE) WOOD] - SUPPLIER/TYPE

Table B-4, the table R, contains all rows of the form (SName,Type) that are not in the SUPPLIER/TYPE table. Put another way, it is the set of “missing possibilities” in the Cartesian product (which is the set of all possibilities).

Table B-4. R

Sname

Type

Austin Hardwoods

poplar

West Lumber

walnut

Austin Hardwoods

mahogany

West Lumber

mahogany

Fred’s Woods

walnut


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