Help with an EER diagram.

From: Wookie <Wookie_at_woo.com>
Date: Wed, 19 Oct 2005 19:00:57 GMT
Message-ID: <JJw5f.148210$RW.52643_at_fe2.news.blueyonder.co.uk>

Can someone please help me identify the entities for an extended entity relationship diagram for the below scenario.

Thanks.

EmJ.

Better Books and Bargains

The book shop sells books, which may be either fiction or non-fiction.

Books have an ISBN, bar-code, title, author(s) / editor(s), publisher, date of publication, quantity in stock, price, quantity on order.

There may be a series title.

Fiction books are either paperback, large paperback or hardback and may be ranked in 'The Guardian' top 40 best seller list.

Non-fiction books belong to a subject area and may have an edition number.

Due to the expansion the shop now also sells other merchandise such as:

· magazines which have a bar-code, title, and issue number and/or
date, publisher, price, quantity in stock, quantity on order.

· stationery items with bar code, price, quantity in stock, quantity
on order, description, supplier.

· greetings cards with bar-code, price, type, quantity in stock,
quantity on order, printer, description, supplier.

· seasonal items with bar-code, price, quantity in stock, quantity on
order, supplier, start date, end date, description.

Customers make purchases for which they receive receipts having a receipt number, date, quantity, bar-code, brief description, price and sales person code.

Sometimes a special offer voucher may be offered in payment. These will have a voucher number, value, company of issue and expiry date.

The issue of a receipt causes the quantity in stock to be updated.

The sales person code is used to calculate the monthly bonus. Received on Wed Oct 19 2005 - 21:00:57 CEST