From: | Gianluca Riccardi <ml-reader(at)moonwatcher(dot)it> |
---|---|
To: | pgsql-sql(at)postgresql(dot)org |
Subject: | Re: DB design and foreign keys |
Date: | 2005-12-14 10:25:50 |
Message-ID: | 439FF32E.7030004@moonwatcher.it |
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Thread: | |
Lists: | pgsql-sql |
Jaime Casanova wrote:
> [...unnecesary...]
>
>
>> CREATE TABLE orders (
>> id serial,
>> order_code serial,
>> customer_code integer REFERENCES customers (customer_code) NOT NULL,
>> order_date time without time zone NOT NULL,
>> remote_ip inet NOT NULL,
>> order_time timestamp with time zone NOT NULL,
>> order_type varchar(10) NOT NULL,
>> state varchar(10) NOT NULL,
>> PRIMARY KEY (id, order_code)
>>
>
> ^^^^^^^^^^^^^^^^^^^
>
>
>> );
>>
>
> [...unnecesary...]
>
>
>> CREATE TABLE order_items (
>> id serial,
>> order_code integer REFERENCES orders (order_code) NOT NULL,
>>
>
>
> ^^^^^^^^^^^^^^
> [...unnecesary...]
>
>
>> ERROR: there is no unique constraint matching given keys for referenced
>> table "orders"
>>
>
>
> this is because the PK in the orders table has two fields not one...
> so it founds no unique index on orders(order_code)
>
>
>
then, what would you suggest, to remove the primary key from the 'id'
column? or to remove the 'id' column at all?
>
>
> --
> Atentamente,
> Jaime Casanova
> (DBA: DataBase Aniquilator ;)
>
>
thank you for your response, regards,
Gianluca Riccardi
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