Can the same column have primary key & foreign key constraint to another column

Question

Can the same column have primary key & foreign key constraint to another column?

Table1: ID - Primary column, foreign key constraint for Table2 ID
Table2         


        

Answer 1

Assigning Primary Key And Foreign key to the same column in a Table:

create table a1 (
    id1 int not null primary key 
);
insert into a1 values(1),(2),(3),(4);

create table a2 (
    id1 int not null primary key foreign key references a1(id1)
);
insert into a2 values(1),(2),(3);