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Tables without any relationship needs FK index?

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I have a list of tables without any relationships, since there is no referential integrity between the tables whether we can create any foreign key index for the tables ? or in this case primary key index will suffice? Please clarify.

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If you have tables without any relationships (e.g. Cat and Plane) which foreign keys would you create in these tables The only thing you can do is add a primary key constraint on the unique identifier of each table. And perhaps some (non-unique) indexes to improve performance when searching (and joining).
Consider Paul's rocket mass heater.
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