Access - how to derive a field upon entry of a record

Posted by jonos on Stack Overflow See other posts from Stack Overflow or by jonos
Published on 2010-04-29T11:20:20Z Indexed on 2010/04/29 11:27 UTC
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access

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query

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form

I have an Access database for a media rental company which includes the following tables, among others;

LOAN: customer_id (pk), loan_datetimeLeant (pk), loan_dateReturned (pk)

LOAN_ITEMS: customer_id (pk), loan_datetimeLeant (pk), item_id (pk), loanItem_cost

ITEM: item_id (pk), product_id, item_availability

PRODUCT: product_id (pk), product_name, product_type

MEDIA_COST: product_type (pk), product_cost

So basically the 'product type' (DVD, VHS etc) determines the cost. The 'product id' determines what movie, platform etc each item is.

My question is: When creating a form for the Loan_Items table, how can I populate the loanItem_cost field (so it is stored) whenever a new Loan_Item record is added? I need to store it as the cost of the item (product_cost) may change over time and I'd like to record what the customer paid at the time the loan was made.

Thanks in advance

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