Hello !
I have a case where I wanted to do circular REFERENCES, is this
impossible ?
Just an example where it would be useful :
We deliver to the *shops* of our *customers*.
We have therefore two tables :
- customers (enterprise, financial information, and so on...)
- shop (with a name, street, phone number, name of manager)
Now, each shop REFERENCES a customer so that we know
to which customer belongs a shop.
AND, each customer has a DEFAULT shop for deliveries, i.e. most
customers only have one shop, or a main shop and many small ones.
Therefore a customer should REFERENCES the 'main' or 'default' shop.
Which leads to :
CREATE TABLE shops ( id_shop SERIAL PRIMARY KEY, id_cust integer REFERENCES
customers, .......)
CREATE TABLE customers ( id_cust SERIAL PRIMARY KEY, id_defaultshop integer
REFERENCES shops, .......)
But this doesn't work ! Postgres complains like "ERROR: Relation
'customers' does not exist"
when creating 'shops'.
Someone told me I should create a third table, ok, but in this case I loose
the total
control about my logic... Do you have a suggestion ?
Thanks a lot in advance !
Denis
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