foreign key cautions

[Sharique uddin Ahmed Farooqui-2]

HI,
What are the caution should be taken when designing a db regarding foreign key?

I have "user" table , from which userid is taken as reference in many
tables, is it ok?

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Sharique uddin Ahmed Farooqui
(C++/C# Developer, IT Consultant)
http://safknw.blogspot.com/
"Peace" is the Ultimate thing we want.

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