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Where a foreign key gets its data?

Question asked by jbadham on Apr 5, 2018
Latest reply on Apr 5, 2018 by davidhead

Trying to understand where a foreign key gets its data.  I know to link it to the primary key which has it’s own ID.  But then am I supposed to enter anything myself in the foreign key field? Or does something happen under the hood to populate it?

thanks for any help shedding insight on this