Problem a: as shown in figure, I can express written the relationship between "express" mode {express a single number, the Courier company, address, pick-up code}? But seemed as if the relationship was not the beginning "deposit",
Despite a problem, problem two: can I put my involves the "express", "delivery point", "deposit" relational schema written express {Courier number, address, pick-up code}? Instead of writing three relational schema corresponding express delivery, express delivery, storage?