Help needed in business logic implmentation in oracle sql.

I got a requirement from customer that i need to generated numbers based on first value which is entered by users but not second values..
for example:
c1 c2
1 1
2 1
3 1
4 1
1 2
2 2
3 2
4 2
1 3
2 3
3 3
4 3
1 4
2 4
3 4
4 4
1 5
2 5
3 5
4 5
unlimited..
the user input only first column values which comes from UI and i need to provide second column values when records are getting inserted into db table.
user always enter only 1-4 values in first column but never input second values in second column of table.. both columns are numerical.
the second values should be provided automatically or programmatically when records are getting inserted into table and automatically... how this can be done?
Can any one help me out to get this done either using sql,plsql concept?
thanks a lot in advance.

Hi,
Demonstration
SQL> DROP TABLE t1;
Table supprimée.
SQL> CREATE TABLE t1 (c1 NUMBER, c2 NUMBER);
Table créée.
SQL>
SQL> insert into t1 (c1) values(1);
1 ligne créée.
SQL> insert into t1 (c1) values(2);
1 ligne créée.
SQL> insert into t1 (c1) values(3);
1 ligne créée.
SQL> insert into t1 (c1) values(4);
1 ligne créée.
SQL> insert into t1 (c1) values(1);
1 ligne créée.
SQL> insert into t1 (c1) values(2);
1 ligne créée.
SQL> insert into t1 (c1) values(3);
1 ligne créée.
SQL> insert into t1 (c1) values(4);
1 ligne créée.
SQL> insert into t1 (c1) values(1);
1 ligne créée.
SQL> insert into t1 (c1) values(2);
1 ligne créée.
SQL> commit;
Validation effectuée.
SQL>
SQL> CREATE OR REPLACE VIEW view_t1
2 AS
3     SELECT c1, ROW_NUMBER () OVER (PARTITION BY c1 ORDER BY c1) c2
4       FROM t1;
Vue créée.
SQL>
SQL>
SQL> SELECT   c1,c2
2      FROM view_t1
3 ORDER BY c2, c1;
        C1         C2
         1          1
         2          1
         3          1
         4          1
         1          2
         2          2
         3          2
         4          2
         1          3
         2          3
10 ligne(s) sélectionnée(s).
SQL>

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Please Mark This As Answer if it solved your issue
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Microsoft MVP - Directory Services
My Blog: http://blogs.msmvps.com/MWeber
Disclaimer: This posting is provided AS IS with no warranties or guarantees and confers no rights.
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Help needed in business logic implmentation in oracle sql.

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