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how to update a specific record in the relational tables

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Last Modified: 2012-05-09
I have 4 tables:
sale
location
product
move

when inserting a record, will use the uniq location_id , product_id to insert into 2 tables: sale and move


--the requirement is that select a product_name and location_id to search all related records in the database.
 
--and then can  select an individual record to update it

issue,  i can get 1 more sale_id and move_id when joining these tables, it is hard to pick the record to update.( we are using .net at fron_end)

select * from sale,product,location,move
where sale.product_id=product.product_id
and sale.location_id=location_id
and move.location_id=location.location_id
 
sample-ERD.bmp
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