SQL> create table tab1(id number primary key, col2 varchar2(30));
 
Table created. 
 
SQL> create sequence seq1; 
 
Sequence created. 
 
SQL> insert into tab1 values (seq1.nextval, 'Value 1'); 
 
1 row created. 
 
SQL> insert into tab1 values (tab1_seq.nextval, 'Value 2'); 
 
1 row created. 
 
SQL> select * from tab1; 
 
        ID COL2 
---------- ------------------------------ 
         1 Value 1 
         2 Value 2