alleryStart learning →A foreign key is the relational analogue of
Awriting a vendor's GST number on your invoice to point at a vendor
Bwriting your own Aadhaar number on every form you fill out
Cissuing a fresh passport for every visa application
Dleaving the phone field blank when the number is unknown
Answer & Solution
Correct answer: A. writing a vendor's GST number on your invoice to point at a vendor
A foreign key points outward to a primary key in another relation, like a GST number on an invoice points to a vendor entry in the registry.
Aadhaar-on-your-own-form is closer to a primary key
passport-per-visa describes denormalisation
a blank phone field is a NULL.
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