Hi all,

I have a few questions in relation to a database intended for a 
company that sells antiques for commission on EBay, acquiring them 
from the public. If you have the patience to read them and even 
answer them, that would be fantastic.

[1] Part of this database would require a CLIENTS table, which would 
list the contact details for people from whom antiques were 
acquired. I had orginally intended to link this, via 
*ConsignmentID*, to a CONSIGNMENT table, which would incorporate 
different consignment rates for different categories (e.g trade, 
personal, public etc). But sometimes individual repeat clients have 
special consignment rates permanently allocated. For example, Bob 
Smith from the antique trade might have a consignment rate of 10% 
because he is such a frequent customer. Would it then be best to 
link from CLIENTS to CONSIGNMENT via *ClientID*, or via 
*ConsignmentID*? The complicating factor is that many clients are 
simply one-offs, and therefore would just have a general public 
consignment rate.

[2] Each individual listing has a different postage rate according 
to the destination. For example, each listing will say that US 
postage is $15.00, AU postage is $5.00, etc. Sometimes the currency 
is listed as US dollars (depending on whether it is listed on the US 
site) and sometimes in AU, for Australia-orientated items. I had 
intended to have the following structure for listings:

ITEMS table links to LISTINGS via *ItemID*
LISTINGS table links to SALES via *EbayItemNo*

How would you suggest structuring the postage aspect (needed for 
record-keeping), especially with the currency issue? I had intended 
to have a field in LISTINGS called *Currency*, to select AU or US. 
Should I then use a *PostageID* field to link to a POSTAGE table? Or 
should I just include those fields in the LISTINGS table? (This 
would cater only for quoted postage, but a different approach would 
be needed for actual postage costs once the item has been sold).

[3] There are various calculations that need to occur post-sale. I 
have the following tables linked:

LISTINGS table, to SALES (via *EbayItemNo*)
SALES table to BUYERS (via *BuyerID*)

SALES includes a *FinalPrice* field. The calculations that need to 
happen include:

a) Calculating GST payable based on the *FinalPrice* field in SALES 
(e.g SALES.*FinalPrice*/11)

b) Calculating international insurance (where applicable) based on 
SALES.*FinalPrice* and BUYERS.*Country* (where insurance is $7.50 
for the first $100 of value, and $2 for every $100 increase 
thereafter)

c) Calculating ebay fees, based on:

- Insertion fees
- Gallery fees
- Reserve Price fees
- Final Value fees
- PayPal fees

d) Calculating various commission amounts, including: gross 
commission, commission payable to client (less consignment rate), 
gross commission to company (based on consignment amount less ebay 
fees).

What would be the best approach for such calculations? Should I 
create a new table for this kind of data, or use fields? If so, into 
which of the following tables would I be best to insert the fields?

CLIENTS
CONSIGNMENT
ITEMS
ITEM_CATEGORIES
LISTINGS
SALES
BUYERS
POSTAGE

Any suggestions/redevelopment ideas would be much appreciated. Thank 
you!











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