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Will the facebookId ever change? If not, Is it safe to use it in my app as the primary key?
FACEBOOK_USER
FacebookId (PK)
Name
FACEBOOK_FRIEND
Id
OwnerFacebookId (FK)
FriendFacebookId (FK)
Facebook ID will not change, as facebook also treating them as primary key. But email ID can be changed so dont use email ID as primary key.
I already using the facebook ID as primary key.