Question: Where do you create foreign keys for 1 :m relationships? Are FK values required? Where do you create foreign keys for m:m relationships? Are FK

Where do you create foreign keys for 1:m relationships? Are FK values required?
Where do you create foreign keys for m:m relationships? Are FK values required?
Where do you create foreign keys for 1:1 relationships? Are FK values required?
How do you handle weak entities and associative entities?

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