How to insert data in tables using loops sql

Question

Oracle 10.2g
using Oracle sql*plus
Table student is
create table student(id)
as
select distinct student_id
from students_table;now
desc student; will retrieve
student
======
Name         Null?    Type
===========================
ID                  VARCHAR2(10)Now creating a sequence
create sequence st_seq;
alter table student add column no;
select * from student
no       id
=========
        234
        298
This is the main part
There are 100 student id in the table
now i want to populate the table with sequences using seq.next_val
how to use a loop to insert 100 auto generated numbers in the table.
Thank you.
Expected result
Select * from student
no     id
=========
1     234
2     298
.........Why i am doing this way instead of
create table student(no,id)
as
select st_se.nextval,student_id
from students;This will cause duplication of upn
using distinct would throw an error.
create table student(st_id,id)
as select distinct st_seq.nextval,academicyear
from student
as select distinct st_seq.nextval,academicyear
ERROR at line 2:
ORA-02287: sequence number not allowed hereThank you.

Answer 1

Follow the example:
SQL> create table students_table (student_id number);
Table created.
SQL> insert into students_table values(10);
1 row created.
SQL> insert into students_table values(10);
1 row created.
SQL> insert into students_table values(20);
1 row created.
SQL> insert into students_table values(30);
1 row created.
SQL> insert into students_table values(40);
1 row created.
SQL>
SQL> commit;
Commit complete.
SQL> select *
2 from students_table;
STUDENT_ID
10
10
20
30
40
SQL> create sequence st_seq;
Sequence created.
SQL> create table student(no,id)
2 as
3 with distinct_table as
4 (
5 select distinct student_id
6 from students_table
7 order by student_id
8 )
9 select st_seq.nextval, student_id
10 from distinct_table
11 ;
Table created.
SQL> select *
2 from student;
NO ID
1 10
2 20
3 30
4 40
SQL>
Cheers,
Davide