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I know that one-to-one relationships can be used to split data into multiple tables for performance or security and that it is used to create a is-a-relationsship.

But aside from that things, what is the real-world prupose of an optional one-to-one relationship, expecially one where both sites are optional?

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It allows records to exist on either side of the relationship independently, with ties between records that happen to be related. If you have a real life question about this you should add the details.

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appropriate for modelling a marriage? –  JMD Coalesce Mar 21 '13 at 18:31
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