SQL>
SQL> set echo off
SQL> create table emp(
2 emp_id integer
3 ,lastname varchar2(20) constraint lastname_create_nn not null
4 ,firstname varchar2(15) constraint firstname_create_nn not null
5 ,midinit varchar2(1)
6 ,street varchar2(30)
7 ,city varchar2(20)
8 ,state varchar2(2)
9 ,zip varchar2(5)
10 ,shortZipCode varchar2(4)
11 ,area_code varchar2(3)
12 ,phone varchar2(8)
13 ,company_name varchar2(50));
Table created.
SQL>
SQL> create unique index pk_idx on emp (emp_id);
Index created.
SQL>
SQL> alter table emp add (constraint pk_alter primary key(emp_id));
Table altered.
SQL>
SQL> select index_name, table_name, column_name from user_ind_columns where table_name = 'emp';
no rows selected
SQL>
SQL> select constraint_name, table_name, column_name from user_cons_columns where table_name = 'emp';
no rows selected
SQL>
SQL> drop table emp cascade constraints;
Table dropped.