One to one relationship modelling

Hi all
How to model a one to one relationship?
i have a scenario where i had to maintain 2 different entities and cannot merge them into a single table coz they are separate entities
Now while modelling them ... do we need to have a primary key for the second table (or)
use the primary key of the first table as the foreign key on the second table with Unique constraint on it .
Ex: a single subscription has a single criteria
subscription table ........... and criteria table
now should i iuse criteria id as a primary key of criteria table ? (or)
subscription id as the foregin key in the criteria table ?
or allow include both in the criteria table
please suggest
Thanks and Regards
Raj

hi dportas,
first of all thanks for your respose...
what is reciprocal foreign key?
my scenario is like this
i have a table called subscriptions which records all subscriptions that we have subscribed to to receive an alert to our email primary key is subscriptionid.
every alert has an alert criteria with different set of attributes
hence i have 5 alert criteria tables... each with totlally different type of attributes
eg: balance criteria (balanceamount,condition) cutoff criteria(cutofftime,....)
we can subscribe to only one alert in a single subscription
hence subscription to balance criteria table is 1-1
subscription to cutoff criteria table is 1-1
now my question is that shoudl each of the criteria table should have criteriaid (or) should i put subscription id as the foregih key in each of the tables for relationship

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sonx wrote:
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user628400 wrote:
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One to one relationship modelling

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