Answer / shiva

the primary key is used identified the unique value
presented in the table but foriegn key is used to refer the
value of the table that have unique vale,multiple foriegn
key present in multiple tables

Answer / preethi

a table must have single unique primary key but mutiple
foriegn key to refer different tables.

Answer / aaa

combination of columns is called primary key and columns in
one table whose primary key matches with other table is
foreign key

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