Re: Redefining an existing Table Schema for Foreign Key Constraint - Question

In article <20081106213736(dot)GB25016(at)tamay-dogan(dot)net>,
Michelle Konzack <linux4michelle(at)tamay-dogan(dot)net> writes:

> Hallo Harald,
> Am 2008-11-03 13:41:52, schrieb Harald Fuchs:
>> In article <20294223(dot)post(at)talk(dot)nabble(dot)com>,
>> Brian714 <bndang(at)uci(dot)edu> writes:
>> > Customers Table
>> > id:integer -- primary key
>> > first_name:varchar(50)
>> > last_name:varchar(50)
>> > cc_id:integer references Creditcards.id
>> > address:varchar(200)
>> > email:varchar(50)
>> > password:varchar(20)
>> This is the usual 1:n relationship, but I think you got it backwards.
>> There are two questions to ask:
>> 1. Are there customers with more than one credit card?

> This could be a problem for the above table...

>> 2. Are there credit cards owned by more than one customer?

> CreditCards are personaly and sometimes (in France) I need an ID card to
> prove, that I am the holder...

> So how can one credit card can have more then one owner?

That's exactly why I told you "I think you got it backwards".
You need a cust_id column in your CreditCards table, not a cc_id
column in your Customers table.