Question: ABC Markets sell products to customers The relational diagram shown

ABC Markets sell products to customers. The relational diagram shown in Figure represents the main entities for ABC’s database. The following important characteristics:

A customer may make many purchases, each one represented by an invoice.
The CUS_BALANCE is updated with each credit purchase or payment and represents the amount the customer owes.
The CUS_BALANCE is increased (+) with every credit purchase and decreased (-) with every customer payment.
The date of last purchase is updated with each new purchase made by the customer.
The date of last payment is updated with each new payment made by the customer.
An invoice represents a product purchase by a customer.
An INVOICE can have many invoice LINEs, one for each product purchased.
The INV_TOTAL represents the total cost of invoice including taxes.
The INV_TERMS can be “30,” “60,” or “90” (representing the number of days of credit) or “CASH,” “CHECK,” or “CC.”
The invoice status can be “OPEN,” “PAID,” or “CANCEL.”
A product’s quantity on hand (P_QTYOH) is updated (decreased) with each product sale.
A customer may make many payments. The payment type (PMT_TYPE) can be one of the following:
“CASH” for cash payments.
“CHECK” for check payments
“CC” for credit card payments
The payment details (PMT_DETAILS) are used to record data about check or credit card payments:
The bank, account number, and check number for check payments
The issuer, credit card number, and expiration date for credit card payments.
a. On May 11, 2014, customer ‘10010’ makes a credit purchase (30 days) of one unit of product ‘11QER/31’ with a unit price of $110.00; the tax rate is 8 percent. The invoice number is 10983, and this invoice has only one product line.
b. On June 3, 2014, customer ‘10010’ makes a payment of $100 in cash. The payment ID is3428.
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  • CreatedDecember 03, 2014
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