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composite key, so the table is 1NF. Further analysis shows that
InvDate is dependent on only part of the key (InvNum), and that
unitPrice, PubCode, and BookTitle also depend on part of the key
(ISBN13). A transitive relationship is also revealed: PubName truly
depends on PubCode, which in turn depends on ISBN13. 
2. Using the answer to exercise 1, remove all partial dependencies and
draw the new dependency diagrams. For each new table created,
specify its normal form (1NF, 2NF, 3NF).
Figure 2- solution 2
Discussion: To achieve 2NF, we must remove partial dependencies.
This is done by decomposing into three tables, and three dependency
diagrams at this stage. Notice that the Transitive relationship has not
yet been addressed.

3. Using the answer to exercise 3, remove all transitive dependencies,
and draw the new dependency diagrams. For each new or revised table,
specify its normal form.
Figure 3 – Solution 3
Discussion: The transitive relationship has been removed by creating
the Publishers table, in which PubName is fully dependent upon
PubCode. Pubcode also persists as a dependent attribute and Foreign
Key in Books. All tables are now in 3NF, and have been given
meaningful names reflecting the entities they represent. LINEITEMS
represents the collection of line items for all invoices. Invoices
represents the collection of Invoices for all customer orders. Books
makes up the list of all books available for sale (whether they have