Beginning Oracle Database 11g Administration From Novice to Professional

CHAPTER 2 SQL AND PL/SQL 43
Suppliers Who Supply at Least One Part That Is Not Supplied by a Specified Supplier
Notice the inline view that occurs in Listing 2-24. Also notice the use of the keyword
—it is required because SQL does not automatically eliminate duplicates. The in
indicate that is a variable element. Oracle will request a value
for when you execute this statement.
Listing 2-24. Suppliers Who Supply at Least One Part That Is Not Supplied by a Specified
Supplier
Suppliers Who Do Not Supply at Least One Part That Is Supplied by a Specified Supplier
The answer to this problem is similar to the answer to the previous problem. All that
changes is the order in which one table is subtracted from the other, as shown in
Listing 2-25. Notice that we have to once again use the keyword to eliminate
duplicates.
Listing 2-25. Suppliers Who Do Not Supply at Least One Part That Is Supplied by a Specified
Supplier