foreign key plsql

1CREATE TABLE supplier
2( supplier_id numeric(10) not null,
3  supplier_name varchar2(50) not null,
4  contact_name varchar2(50),
5  CONSTRAINT supplier_pk PRIMARY KEY (supplier_id)
6);
7
8CREATE TABLE products
9( product_id numeric(10) not null,
10  supplier_id numeric(10) not null,
11  CONSTRAINT fk_supplier
12    FOREIGN KEY (supplier_id)
13    REFERENCES supplier(supplier_id)
14);