Answer / vishal

foreign key is the key reference of primary key in first
table suppose u have two table emp and dept in both there is
deptid than we make deptid in dept table as foreign key and
on we add dept in the dept table only when there is entry in
emp table and delete from emp only when there is no
corresponding entry in dept table

Answer / malli

foregine key is normal key of first(base) table. in
second(child)table it is primary key which is referenced by
the first(base) table.

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