Figure 4-33 (page 194) shows an EER diagram for a simplified credit card environ

Question

Figure 4-33 (page 194) shows an EER diagram for a simplified credit card environment. There are two types of card accounts: debit cards and credit cards. Credit card accounts accumulate charges with merchants. Each charge is identified by the date and time of the charge as well as the primary keys of merchant and credit card. a. Develop a relational schema. b. Show the functional dependencies. c. Develop a set of 3NF relations using an enterprise key.

If possible please simply include a drawing of what this would look like.

CUSTOMER Customer ID Cust Address Holds CARD ACCOUNT Account ID MERCHANT Merch ID Merch Addr Card Type Card Type- "D C" DEBIT CARD Bank No CREDIT CARD Cur Bal CHARGES Charge Date Charge Time Amount

Explanation / Answer

Relational schema::

customer(name,address)
merchant(mech id, addr)
cardacc(id,expdate,type)
charges(date,time,amount)   

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