SQL>
SQL>
SQL> -- create demo table
SQL> create table Customer(
2 id NUMBER(3) primary key,
3 NAME VARCHAR2(15 BYTE)
4 )
5 /
Table created.
SQL>
SQL> create table account (
2 id NUMBER(3),
3 type VARCHAR2(20 BYTE)
4 )
5 /
Table created.
SQL>
SQL> ALTER TABLE account
2 ADD CONSTRAINT fk
3 customerid REFERENCES customer(id);
Table altered.
SQL>
SQL> drop table account;
Table dropped.
SQL>
SQL> drop table customer;
Table dropped.
SQL>